How to get the best out of this forum

Hello,

Welcome to the Arduino Forum.
This guide explains how to get the best out of this forum. Please read and follow the instructions below.

Being new here you might think this is having rules for the sake of rules, but that is not the case. If you don’t follow the guidelines all that happens is there is a long exchange of posts while we try to get you to tell us what we need in order to help you, which is frustrating for you and frustrating for us.

The people who try to help with your project are volunteers doing this for free in their spare time. If you follow these guidelines it helps us to help you and gets your project working quickly.

Without the correct information, it is difficult or impossible to give you the help you need.

Preferred language
If English is not your preferred language there are categories in other languages

Essentials

Below are some things we need which are often missed by people posting for the first time

Choose the right category of the Forum

There are lots of different categories to choose from. Choosing the right one is important because not everyone who might be able to help you reads every category. Some questions might reasonably fit in to more than one category but please do not post the same question in two or more different categories. This just wastes your time and ours as different people will be providing different answers in different places. For this reason, it is against the forum rules and will incur the wrath of the moderators when they see it.

Hardware

We need to know exactly what hardware you have. We need to know what Arduino board (or other brand, such as ESP32) you are using and exactly what other hardware you are connecting it to. The more details we have, the easier it is to help.

If you are using something that is a non-Arduino product then it helps to have a link to its technical data sheet or a link to where you bought it.

Code problems

We can only find problems in code we can see. Please supply your complete code in code tags </> More about posting code and using code tags. If you are using Arduino Create then you can post a link to your project (but keep in mind that not everyone uses Arduino Create).

Posting a snippet of code is generally useless. The problem is usually in another part of the program.

Before posting code, please use Tools / Auto Format at the top of the IDE. It makes the code much easier to read and you will probably find it very helpful yourself. Once you've done that, use Edit / Copy for Forum.

Always use code tags (</>) when posting code or compiler error messages.
Using code tags makes the code easier to read and easy to copy. Not using code tags means some of the code gets displayed with smiley faces and other stuff that should not be there. Be aware that there is a limit of 120000 characters for a post. If your code takes you above this limit then you can add your .ino file as an attachment. However, it will be much easier to help you if you can write a short program that illustrates the problem you are having and post that.

Please don't post an image of code instead of the code itself, or an image of error messages instead of the error messages themselves.

It is very important to be clear about what is expected from code and what happens instead. Code ALWAYS works; that is the nature of code. Whether it does what you expect is a different thing altogether. We need to know what you expected the code to do and what happened instead.
More about posting code and common code problems.

Schematics or circuit diagrams

The language of electronics is a schematic or circuit diagram. Long descriptions of what is connected to what are generally useless. A schematic is a drawing of what connects to what; please make one and photograph it. We don't mind if it's hand drawn, scruffy and does not use the correct symbols. Please don't post Fritzing diagrams. They may look nice but they are very easy to misinterpret

If you want to use computer software to create a schematic, then you might like to try either Eagle or KiCad.
More about creating a schematic of your project including how to upload an image.

General

Please try to avoid posting links to other sites where code or photos or schematics are hosted. Most of us will not follow such links, partly due to the risk that they hold malware or other unwanted content, partly to maintain everything on this site for the benefit of future users looking for an answer to a similar question, and partly because we feel that if you want our help you should provide everything we need on this site not expect us to go hunting elsewhere for it.

Research

Please do some research before posting. Most beginner problems have already been dealt with on the Forum so please use the forum search tool and the Arduino Help Center to try and find an answer to your question. You can also use your favorite search engine to find answers too.

Be specific

Please ask a specific question about the problem you are having so we can provide a clear, specific answer.

If you don't understand some of the advice that you get, please say so. Then we can explain in more detail. If you want to know more about how to ask a question that is likely to get a really helpful answer, then have a read of this, admittedly rather long, tutorial How To Ask Questions The Smart Way and use the principles explained there to ask a really effective question here.

About us

Those of us answering questions have a wide variety of backgrounds and electronics knowledge, some through working in electronics or computing, some through electronics or computing as a hobby, some both. Most of us are not trained as teachers so probably miss the finer points of how to teach and explain things effectively. We are not, with the odd exception, employees or representatives of Arduino.
Please also remember we are volunteers doing this for free in our spare time and are more inclined to help people who make it easy for us to provide help by providing the information we ask for.

About you

We only know about you and your project what you tell us. If you tell us your level of experience with electronics or microcontrollers, we can tailor our answer to your level of knowledge. We also don't know if you have problems with English or language or communication in general unless you tell us. We can be sympathetic about things we know about, but if you don't tell us we don't know.

More information

There is more information below.

Making your first post

Now please go to the forum index, select the right category and make your first post.

Thank you.


Making your first post

1. Choose the right category

It is important to choose the right category and the right language so that the people most likely to be able to help you will see your question. Not everyone here reads questions in every category so please take your time and post in a category related to your question.

If English is not your preferred language then scroll down and choose from one of the other language categories.

Please only post in English in the English language categories. If your language is not shown then please use Google Translate and post in an English language category using English.

Forum categories

2. Make a topic

Once you have found the right category you can start your post. Click on New Topic

Starting a new topic

3. Write your post

Enter a title and a description of your problem:

Don't forget to include code in code tags </> and a schematic of your circuit.

For your first two posts, the right hand side of the post composer pane will show a welcome message. Once you have closed that message, you will see a preview of how your post will look once you have submitted it.

4. Publish your topic

When you are happy with your post click on + Create Topic to post it.

That's your first post completed.


Posting code and common code problems

Post all your code

Without your code, all your code, we cannot provide any answers about your code, other than the most vague and probably unhelpful of answers. One of the frustrating things about writing code is that a mistake in one place can produce an error in what seems like a completely different, unrelated place. This is a nightmare if you are new to writing code, but often easy to spot for anyone who is experienced in looking for such problems. It is for this reason we want all your code, not just the bit with the error or the bit you think is causing the problem.

Format your code

Before copying your code for the forum, look in Tools on the menu bar of the Arduino IDE and select Auto Format. This will format the code correctly. If you prefer, Ctrl+T will do the same thing. Once formatted, you can copy and paste your code with code tags.

Use code tags

Code should be be in code tags, these are the </> in the tool bar above where you edit your post, and correctly formatted, like this:

char message[][4] = { "hi", "bye" };

void setup() {
  //Serial.begin() configures the serial port
  Serial.begin(9600);
}

void loop() {
  for (byte x = 0; x < 2; x++) {
    Serial.println(message[x]);
    delay(1000);
  }
}

If you don't use code tags then it ends up like this:


char message[4] = { "hi", "bye" }; // <---- There's a box now

void setup() {
//Serial.begin() configures the serial port // <---- Some strange link
Serial.begin(9600); // <---- Indentation lost
}

void loop() {
for (byte x = 0; x < 2; x++) {
Serial.println(message); // <---- There's a checkbox
delay(1000);
}
}


There's more than one way to add code tags, you can:

  • Paste your code in the box where you are editing your post, select all the code and click on </>.
  • In the Arduino IDE under the 'Edit' menu there is 'Copy for Forum', this puts your code on the clipboard with code tags added ready to paste into your question.

Minimal, Reproducible Example

The forum has a limit of 120000 characters per post, which means that you can't post a program longer than this directly. In this case, you can attach the .ino file to your post or, if you are using Arduino Create, you can post a link to your project.

However, consider that the longer your program, the harder it is for anyone to understand it and help you. For this reason, consider writing a short program that illustrates the problem and post or link to that instead. You are more likely to get help with a short, easy to understand program than with a long, complicated one. For more about this see How to create a Minimal, Reproducible Example.

Error messages

When you compile your code the Arduino IDE will check for certain problems with the code and generate error messages to indicate any problems it finds. If this happens then we need to see the error messages as well as the complete code, as the error messages offer clues to what the problem is. If you have error messages then in the bottom right hand corner of the IDE there will be a button 'Copy error messages'. Click the button and paste the result into your question, don't forget to add the code tags.

Common mistakes with code and posting code

Posting a screenshot of code or error messages. A screenshot is useless, with a screenshot it is impossible for us to paste the code into the IDE and test it. Please post your code and error messages, not an image of them.

Only posting the part of the code you think has the problem. Often code problems are not in the place they might obviously seem to be, often a mistake in one place shows up as a problem elsewhere. The only way to see this is to see all the code. Also be aware that some mistakes cause a cascade of multiple errors. If this happens, deal with the first one and see if the other disappear.

It is essential that every opening bracket has a corresponding closing bracket. Check that every { has a corresponding }, every ( has a corresponding ) and every [ has a corresponding ] before you post your code. In the IDE if you place your cursor next to any bracket of any kind the IDE will draw a rectangle round its partner, if there's no corresponding bracket, or there is a corresponding bracket but it's not the one you expected then you have found your problem. Also, if you use Auto Format (Tools > Auto Format or Ctrl+T) your code will be tidied up and missing brackets of all kinds should become a lot easier to see.

Forum rules and netiquette

The instructions above are to help you make a successful post, 'successful' meaning you get a useful and satisfactory answer to your question. In order to keep the forum working smoothly there are some rules that apply to everyone, breaches of which can lead to suspension or being removed from the forum altogether.

Only ask your question once, in one category of the forum

We know you are anxious to get an answer to your problem, but re-posting the same question to multiple categories of the forum causes duplicate effort, and divides the focus on your problem. You'll get a better answer if everyone can discuss it in one place. Asking the same question multiple times is called cross-posting. Cross-posting is very annoying to people trying to help you. If you cross-post, the moderators will delete your extra posts, and you will get a warning. Save all the hassle, and just post the question once. It will be noticed.

If you aren't sure which category to post in (Programming Questions, General Electronics, etc.), make a guess. Don't cross-post "just in case".

Start a new topic; don't hijack an existing topic

You might see an existing topic related to what you want to ask and think about tagging your question on the end. Please don't do this. If the existing question is just what you were looking for and the answer helps you then there is no need. Otherwise, the existing topic isn't what you were looking for and you should create a new topic. There's no harm including a link back to the existing discussion if you think there's some relevance.

Don't bump!

Don't bump your topic after an hour. Because of the different time zones, the person who knows the answer may be asleep, or away for the day or maybe on holiday. Maybe after a couple of days, but even then think about whether you have provided enough information and asked a question that can be answered. You could even ask us 'what else can I provide in order to get some help?'.

Getting help from a particular person

You might have read answers from a particular person and think that person would be the best person to help you. You can bring your question to someone's attention by using @ followed by their username, for example @username. If you do this, they will get a notification. Please do not send a PM (private message) to someone you don't know asking a question; most will ignore you.

Commercial projects

One thing really guaranteed to ensure you don't get help is to tell us you can't provide all the information because it is commercially confidential. If it's commercially confidential then you should consider paying someone to help you and ensure a confidentiality agreement is in place with them. If you want help with a commercial project then create a topic in 'Gigs and Collaborations' and indicate what your terms are, including how much your budget is. This is a hobby forum, not a place for free help with commercial projects.

Ready written code

Ready written code for every possible application does not exist, including for your application. Asking for the code for what you are trying to do will not get you anywhere, other than possibly some annoyed replies. You either have to write your own, which we are here to help with when you get stuck, or you can pay for someone else to write it for you. If you want someone to write code for you the place to ask is 'Gigs and Collaborations'. If you neither want to learn to write code yourself nor pay someone else to do it for you then this is probably not the right place for you.

Be polite

A little courtesy and politeness goes a long way. Even if you think a question has been asked before, or you don't see the point of it, try to answer politely. Remember a lot of the posters with high post counts see the same questions every day, and they may get a bit terse if you appear not to have tried very hard to help yourself in the first place. You will find that if you respond in a friendly way, people will stick with you and you will almost certainly get your problem solved. Personal insults, rudeness and offensive language are not acceptable and will result in a ban. Stick to the topic.

DON'T SHOUT

TYPING IN ALL UPPER CASE is considered to be SHOUTING. It won't get you an answer any quicker, it will just annoy people.

Homework

We get a lot of questions from students wanting help with their homework. Such questions are generally one of two kinds: Questions by students who are obviously making a real effort but have got stuck; these get helpful answers. Questions from students who are obviously not making any effort at all and just want someone to do their homework for them; these usually get a lecture. By all means, post homework questions when you are stuck, but make sure you've put some effort in first.

Thank people who help you

Those of us who answer questions on here are doing so for free, out of community spirit. Please thank people who provide helpful answers and don't forget to give :heart:s as well.

It also helps if you click the :ballot_box_with_check: Solution button at the bottom of the reply that answered your question. This will make it easy for helpers to see that it is solved and for others with the same question to find the answer quickly.

Credits

Much of this tutorial has been inspired by or copied from the original forum instructions created by Nick Gammon.
My thanks to Ballscrewbob, Robin2 and Idahowalker all of whom have provided a great deal of support and feedback, without which this tutorial would contain far more errors than it does and would be a lot less clear than it is.

Feedback

Please provide comments, feedback or suggestions for improvements for these instructions here.

Thank you.

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Digital pin reading "High" when plugged into specific computer
Issues using Arduino micro to control volume keys
Need 25 Pin as out put 2 pins for sensor & 23 for Relays
Bosch 4 bar map sensor not reading after 2 bar?
Please help me with my stepper motor issue
Dot Matrixes not displaying programmed display
Help with motors - only forward or backward. [L293D & NodeMCU v2]
Multiple ultrasonic sensor not working but wroking indivisualy
How to Code 28BYJ-48 Step Motor for Vending Machine
Nano serial com issue
Mega 2650 solar tracker LDR Relay
My second RTC module, another broken one [Solved]
Another Weather Station (with e-Paper)
Cannot get code to work with ATmega328P
Best powersupply for Arduino Mkr 1000
Urgent Help Needed Please!
IDE 2.0 Beta 7 ; Serial monitor displays the wrong switching states HIGH/LOW
Stepper Vibrate - Empty Arduino
SSD1306 display troubleshoot
Esp32 Not decoding Li-Fi
Problems with my code
Errors with .init
SdFat - ENABLE_EXTENDED_TRANSFER_CLASS
Errors Onesheeld code please help me
Proyecto Dispensador fino graneador
Same timing variable returning two different times
LCD is functioning, will not display
Uploading Error after boxing it
My code keeps repeating from the previous code that I programed
Reading Sensor Values from Myoware Muscle Sensor
CT SENSOR Calibration (Very Important)
How often does an arduino check a value
Problem with connecting a MCP23017 with arduino Uno
Is it necessary to power a motor via an encoder?
Sim 800L yazılım hata
Loss of internet access but not Ethernet Arduino mega with Ethernet shield
Arduino doesn't display anything
Push button Switches Won't work
Survey the data transfer speed of ESP32-Wifi
ILI9486 TFT touch screen caused unexpected circuit behavior
3x4 Keypad detecting "*" instead of "0"
Can you store a lines of code in a variable?
Why is my if statement (bottom of code) causing an error in my #define string at the top?
Choosing microphone sensor for long range
Coin operated water dispenser help!
TCS3200 color sensor returning 0 values for RGB [solved]
MCP4725 ardunio
Issue in String Comparison
Arduino Door lock system using fingerprint and keypad both
Using Arduino Nano as a IR Remote Switch
How to merge two codes together?
Li-Fi based Text Communication between Two Arduino
Using namespace to separate two "functions" in one ino file
I2C LCD(16,2) not displaying text
ICM-20948 SDK out of memory when using DMP
Arduino Door lock system using fingerprint and keypad both
Compare problem
Multiple TFT Displays with Due using multiplexed SPI CS
Marlin firmware, 'init' is not a member of 'U8GLIB'
Water Flow sensor Switch
Ldr sensor problem
How to increase analog output pin current?
Arduino Sensor Kit : arduino_sensorkit 1.0.9 library for I2C buggy?
Having trouble with the "if" function
5.1 volume control
Keypad problem with ghost keys
AtMega328p and Relays
Reading a 5 bit encoder on a Port with 0ne instruction
Arduino DS3231 RTC coding question
Keyestudio ccs811
Send HIGH or LOW signals from micro:bit to arduino using micro:bit pin 0
Data section exceeds available space in board
Code writing problem
Converting from byte to integer in arduino
My MPU 6050 is not connecting
Nrf24l01 module not working
Arduino robot stops working when I disconnect it from the laptop
Compiler errors with TFT ili9341
SPI problem with radio and SD devices
Unable to find string literal operator 'operator“”redmi' with 'const char [11]', 'unsigned int' arguments
Color sensor RGB
Stepper motor driver power LED not switching on
How to implement arduino emergency button
Missing library board files
Sketch does does not execute on UNO R3 + WiFi ATmega328P+ESP8266 (32Mb memory) USB-TTL
Send String via Bluetooth
Serial Monitor error, using ESP32
ButtonPress - setting of variable
Rotary Encoder LCD Blinking text
Serial connection issue
Adafruit SSD1306 & DHT Sensor libraries, any know issues?
Variating 5v voltage
Code needs double checking
Help needed with RTC1307 Code :)
Transistors or resistors in parallel
NodeMCU does not light properly. Attendance system using RFID, nodeMCU and arduino uno
No matching function for call to 'HardwareSerial::println(FirebaseJsonData&)'
Motion Sensor Light timer
Help required with Arduino, TB6600 driver and Nema23 Stepper motor
Arduino Speen sensor from Joy it
Setting up the Relays to water for 30 seconds each when individually triggered
Problem with if()
Weird compilation error
Servo shifts to last position of other pwm servo
First try with .h and .cpp, Multiple Definition issue
New to arduino and coding
Arduino Editor Issue
Error? DHTPIN was not declared in this scope
I2C LCD(16,2) not displaying text
Problème d’alimentation : câble trop long?
(Beginner) Logic understanding problem for a toggle switch
Schematic for my useless box (first project)
Very Broken program
I am having an issue sending and receiving $_POST values in my PHP script
Trying to make a simple Lixie clock and cant Figure out the code
Why does my code not loop?
Sorting data before averaging
Help ! Serial Monitor
All A Ports Reading Weird
Remote control (on/off)
How a character is converted to a string. How to read data such as Esp32, bluetooth low energy Serial.readString ()
Set Timer for automatic pet feeder
How i can save string password in eeprom when i change password
I have problem with the if statment
My rfid won't read a card
How do i connect autonics temperature and humidity sensor with arduino
NRF24L01 Causes servo to vibrate
Increase the number of led matrix to 8
I'm trying to write simple code to move my servo but cant figure it out!
Glcd project using arduino uno
Arduino not connected on raspberry pi reboot
Question about direct current motors
Run the Goldbach Conjecture
How to get the best from this forum feedback and comments
chipKIT MAX32 - Serial Monitor
Engine coolant sensor trouble
DC motor turn on if sensor triggerd untril button pressed
Connecting the Arduino with an UR3
Arduino short pulse issue
Arrays in a library
Loop is broken (led is not blinking for long time it was broken)
How do I trigger a continuous servo motor (FS90R) with an ultrasonic sensor (HC-SR04)?
Alarm clock coding error
Error Playing a Mellodia "exit status 1 aggregate 'timer treplaceMe611347' has incomplete type and cannot be defined" using ProtoThreads Library and Timer
TFT_eSPI touch demo compile error
A simple question
I’m a beginner to arduino programming. I’m trying to develop home automation project based with blynk. I’m trying to memorize commands on the EEPROM.This is my code. Please Help to modify it
SSD1306 allocation problem
Function-definition is not allowed here before ‘{’ token
Lcd I2C 16x2 doesn't work
How to fetch data from node mcu to arduino uno
Stepper motor code question
However i am getting the error code, expected unqualified-id before numeric constant, on line two. has any one got any ideas on how this can be solved?
Would this Nano every code runs on a Nano Atmega?
Finding the minimum, middle and maximum values
How can I output a signal from an electric guitar to an amp with arduino uno?
Old UNO sketch has failed
A bug for grammar auto checking IDE 2.0. beta 7
May I know why would this happened and how can I solve it?
Need help with explaining me a code
Help needed to merge two void loops
Detect key press while running algoirhtm
Problems with sending can bus message using arduino DUE
Servo motor with one button
I'm having servo trouble
Struggle to run Arduino Uno Wifi R2 for more than 5 minutes.... :|
Facing problem with EEPROM results
I’m new. Please help me with this coding
New guy trying to learn
MAX30105 heart rate sensor not recognized by its own library
TX to rx and RX to TX aint working correct
Serial Input from multiple characters
Arduino 1 switch , 1 poten , 1 lcd , 1 buzzer
Servo rotates 180 degrees with UNO, but only about 80 degrees with D1 Mini Pro (esp8266)
How to name the temperature sensors instead of printing address using ds2482-100 and ds18b20 sensor- Help
Bluetooth module lib
LED Cube Verticle Animation Failure
Motor with fixed frequency but changing amplitude
Error message : a function-definition is not allowed here before '{' token
Program for combination of falme and temprature sensor with 2 module relay
Creating a window of time using TimeAlarms
Serial Communication between Two Arduino Boards
ESP8622 and MCP23016 .-. pinout GPIO.1 , 2 , 3 ... 7 selection
Any one can help me to know how to fix this error when i used MPU-6050
Can I still record data in my SD card module even if my arduino is not connected to the laptop, however my arduino is connected to a power source?
Need Help with programming this code
Some really basic questions on circuit boards
Avrdude stk500-getsync () : arduino uno and mega 2560 avrdude
Serial.readString and pasreInt printing random data
Comparing two ds20b18 values
A bit of help in Modifying the Program
I am trying to interface LM35 temperature sensor and soil moisture sensor
How do I declare for "sendCommand" and "getData"
LMD298 doesnt drive till analogpin has no voltage
ESP8266WiFi Lib Error
Client.connect help
Included library needs to be inculded
Parsing numbers from RS232
Request Serial data
The merits of delay() vs millis()
Convert code from nano to work on mega2560
MAX30105 was not found. Please check wiring/power
Timing Sensor input
How do I switch this from working with TMP36 to DHT11?
Triggering 3 Separate Servos with 3 Separate Sensors
Programing for N298
Coding in arduino ide
Can't get two rf24 to communicate
How to add velocity to your code
Robot bluetooth control and obstacle avoiding
68:4: error: #error "Required HOMING_CYCLE_0 not defined." #error "Required HOMING_CYCLE_0 not defined."
Can Anyone Help Me Understand What I am Doing Wrong?
68:4: error: #error "Required HOMING_CYCLE_0 not defined." #error "Required HOMING_CYCLE_0 not defined."
MeanWell HLG PWM controll
IR sensor spitting out multiple different codes for the same button, and occasional 0's?
CAN-BUS Shield interface with 7 segment display
Problem with printing out a random number
Problem with TFT screen while compiling
Digital RCU tester
Problems with Potentiometer
TFT lcd blank screen
Communication between TWO Arduino nano 33 ble sense
[Solved] Problem with Arduino Logic Analyzer project
Starter experiment/ invalid library
Sending sensor data to cloud server using Arduino Uno and ESP8266
Duplicate rows on 32 x 64 LED Matrix display
Hello team help
Project code sugestion
Monitoring project for a small fish farm
Two sequence using a switch and 8LED
Arduino code for pin i/o over BLE
Self Balancing Robot project- wheels only spin in one direction
My Arduino gesture control project
Facing problem with EEPROM results
Arduino code for pin i/o over BLE
SoftwareSerial TX problem
Using a class from a separate .cpp is not working
Arduino relay and motor issue
Neopixel WS2812B need find code int
Ultrasonic Sensor Code
Arduino code for pin i/o over BLE
Ultrasonic Sensor Code suggestion
Need to run the loop function only when I call any function
BMP180 init fail
Flame sensore detects dire where there isnt
Powering and Controlling Separate LED Strips
ESP32 : Missing terminating " character
Hello i need some help with ultrasonic sensors by communition serial
Arduino Nano not uploading data to Nextion Display
Millis() not delaying
00 scale turntable project
Read SD file into an Array
Unintentional delay with Arduino
HardwareSerial Problem with ESP8266
New User MQTT help
Xvalue not declared in scope
Stop file from looping
Arduino as FM receiver
How would I program this?
Fingerprint not detected
How do i print this string and float value
MCP4725 sinewave generator
I need help with my if statement
Looking for someone to write a simple program
Script only runs if it is connected with the computer
2.4" TFT LCD TOUCH SHIELD inverted
Conditionals in main function do not detect serial port value
Momentary Push Button - One Push for Entire Code
Bro, i got stuck with my code. can you solve this code to connecting to website
Need help controlling motor with arduino
Problems with serial input
2 HC-SR04 (1 as trigger 1 as echo)
HDQ comminication protocol - compile errors
Multiplexer issue
'uint8_t' does not name a type
Trying to segregate serial data and drive outputs
Fine tuning fan noise
8 Servos with Arduino Mega 2560 R3
Not receiving data to the app
Smoothing problem
RF communication problem betwwen ultrsonic and servo motor
Have a problem with control the speed of 2 stepper motor
Analog Reading for Temperature sensor Cumulative value
MIDI touch piano with two MPR121
Getting Interupt every time switch press
WS2812B Don't light more than 31 leds. Need help!
Percent timer by using arduino
Trying to display Serial Data on my LCD Screen
Re: creating alert when system crosses geofence
Pump Control with Mosfet
433mhz led control button
DC motor only runs when arduino is connected to pc
433mhz led control button
Can anyone change this code to use it as a class (preferly mostly private) couse there are some other codes into the code that uses these classes by calling them in swich case or if else
Can't get expected readings using PulseIn command
PIR sensor controlling servo always reading HIGH
NAOS (Arduino OS)
Serial Monitor and FDTI connection
Can't find zip library for 2.0.0-beta4
ESP 32 keeps restarting with AsyncWebServer
Hi friends plz i have problem with my relay i cant get any output from my arduino
Reading messages by Arduino received from SIM800L GSM Module
Simple solar tracker
HC-05 Bluetooth module - laggy transmition
Button LED and sound problem
Arduino calculator using adder and xor
TMRpcm not working (stops playing immediately)
Data request using GSM shield
Ldr sensor problem
ADS124S08 data reading problem
Connecting between two NRF24s
Port busy (fingerprint as608)
Need input please
I want to make a count down time that auto repeats
DS3231 Code - Clarification
RFID wrong code received over RS232
Calculating frequency through analog pin
Adding readings of two load cell
7 segment clock multiplexer error
PROBLEM reading from serial monitor
Arduino UNO - increase motor speed (easy)
School project, SOLVED
How to properly insert delay() function
How to properly insert delay() function
If statement with time condition
SerialSoftware Problem
Nano 33 IoT I2C BLE
ESP32 touch pin to control relay
LCD "Shift" issue
Using a dc motor with a photoresistor
Send SMS once Arduino is triggered via a push sensor
NANO - Uploading forever
(Uno R3)Ultrasonic sensor& servo troubleshooting
LED Ultrasonic Sensor
Lcd printing 2 glitched letters
What is the best way to do this project?
How to programm a panic button
Weather station sketch crash after a few hours
Arduino Fingerprint Coding
Strobe Light Effect, HELP PLS!
Scotchy diode dead
SingleTact sensor
Why is variable "r" always one, even if i ground pin 3?
Hilfe brauche ein kurprogram abschnitt
Please Help! Programming or Wiring problem
How to stop repeat? basic questiom
Help with Stepper?
Looking for a two code fusion 1st for Relay 2nd for Servomotor Everything on a web page? need help I arrived at this result
External Interrupt speed for Nano 33 BLE
Starting and stopping 2 DC motors with limit switches
Can someone combine my coding for this Car lighting system
Nightlight LED not working
ERROR compiling for board generic ESP8266 (Arduino mega))
Multiple servo with multiple sensors
Secondary Clock ''СТРЕЛА" made in USSR
Multiple servo with multiple sensors
Nrf24l01 arduino doesnt work
Simple Nano-based music player using an sd card
I need help with my Arduino UNO!
[solved] tft screen with esp8266
Problema para instalar agente Arduino Create Agen
Show up text on a 8X8 LED matrix, character by character
Set but not used? Really?
28BYJ-48 stepper motor with ULN2003
Code for Multi turn Pot
Modbus TCP with W5100
Self Balancing Robot project- wheels only spin in one direction
Run Programme When Key Switch Enabled
Strange problem, after giving lcd.clear();
Help with code on board and blynk reporting
Reading multiple analogue inputs and printing values
Reading multiple analogue inputs and printing values
Arduino showing an error for some reason
Reading multiple analogue inputs and printing values
288YJ-48 Motor Continuously Spinning in a 2 Motor (Joystick Controlled) Setup
Using digipot to control water temperature
Mini Project Arduino Code help
I want to stop a moving servo with input from a micro switch
Using ultrasonic sensor to detect an object with a buzzer
In function 'void setup()': 66:14: error: expected primary-expression before ',' token
DHT Humidity and Temperature Sensor not working
OSOYOO smart home mega2560 help
TFT touch Screen+ Serial communication
Current or voltage control by PWM?
Multiple led's random on off
Ir sensor trouble
HELP Joystick Type Error
RGB LED controlled using IR Remote
SDI12 and LoRA librarys Problem
GC9A01 display using 8 bit Parallel on ESP32
Two programs in arfuino
Need help with my school project ASAP! expected primary-expression before ')' token
Need help with my school project ASAP! expected primary-expression before ')' token
Switch With Led
Best Sensor for Coin Sorter
Trying to Display Time using time.h
Serial Communication between Two Arduino Boards
Problem with tft 3.5 ili9844, There is no way to get the Bmp out
Basic OOK with the RFM69
Fan Speed AND DHT22 (temp/humidity)
Secondary Clock ''СТРЕЛА" made in USSR
Error: 'FastLED' does not name a type
Help - Problem with Green LED not staying lit
I have problem with project
Error when I upload
Help need for counter status
LCD Display Problem/Question
Lcd progressbar problem help plase
Confused about max amp on boards
Sketch upload error on arduino
Very simple Ultrasonic sensor and distance sensor
Stepper motor not turning correctly
Seven Segment Display Flickering
My code so I can have it evaluated? And maybe be guided
PIR Sensor analog value oscillation?
Help with blinking single LED
How can I create a Water Sensor Vibrator Device?
I made Arduino Korean word clock. Please help me
Program using a button timer
Sketch seems to be skipping data
Servo and MPU6050 IMU problems
Arduino MIDI device issue
Totaling all values of sensors
Problem in serial communication and i2c lcd display not working togeather
PPM Sensor result on LCD blinking
Serial commands from serial monitor queuing
Beginning Arduino/Circuits - Middle School Age Appropriate
L293D motor speed problem
How can I specify this task in if ? is this even possible?
External EEPROM Interfacing With Arduino Uno
Guys please please please help me ASAP
Strange problem with arduino code, upload success but not execute
Communicating two Arduino Nano using SoftwareSerial
Arduino based home intercom(USING WI FI ONLY)
Second value of Serial.println() is always 0
ESP8266 with PxMatrix for P6 RGB 32x32 Matrix
Water flow sensor connection to Uno Board with pull up resistor
Counter implementation on IR sensor
ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]_
Keyboard Code Error Arduino
Need help in EEPROM
I have a problem with pins
On/off button for code
How to stop music on DFPlayer mini
Help Error message!
Two or more data types in declaration of 'timeout'
MKR Wifi 1010 doesn't connect!
Problem sending string using I2C
Problem in Getting Stepper Motor to Rotate
Serial Prints Average Sensor Read
Elevator with 4 floors
SK6812 RGBW Jim Bumgardner hack
Sainsmart 5 inch display, Compile errors
Coding help? vfd to LCD or OLED
Serial communication problem with RS2428 relay module
Homework Help Section
Sketch not running
Arduino uno lcd 16x2 i2c and serial print stuck can't update read data sensor
Arduino Interface with node-red
How can print float to a TFT display
Saving values in array by pressing button
Can anyone help me to program a line follower based pick up and place robot
IR Reciver not working!
PLEASE HELP noob
Buid a TV Lifter
Arduino - bluetootth
Force sensor with Arduino
How can print float to a TFT display
Code for rolling shade using Uno and Stepper
Can't get expected readings using PulseIn command
Please Help me In Debug this code
Question about Arduino Nano Every and Button, LED + Serial
Controlling modded servo continuous rotation
ESP8266 disconnected
RGB LED Beginner Tutorial & Random Colors Every 2 Seconds
Nono + momentary buttons + 2 relay module
Pass data From Arduino to PHP
Invalid conversion from 'const char* to 'char' [-fpermissive]
Shift register with millis possible?
Room to optimize code
Concatination of string
LCD display and Rotary encoder to measure distance
Three Phase Square Wave - An error occurred while uploading the sketch
Controlling a relay with a limit switch
LORAWAN device With RFM95 on Arduino Pro Mini
Using step motor for full and half step
LCD keep flicking
Initializing SD card...initialization failed error
Timeout Error (serial)
Df player mini, can any one help me
Three servos controlled by only one digital input
Servo keeps shaking
Multiple libaries were found for "SoftwareSerial.h"
Adafruit BMP388 Board Arduino Code Error
Adafruit BMP388 Board Arduino Code Error
L298n needs arduino to be connected to pc
Any solution for multiple input shear same pin?
Unbekannte Fehlermeldung beim Sketch
Please help I'm new
Yet another garbled monitor output
How to fix unstable analog output from A0 pin
Problem with code or compiler
Does State machine coding work on Nano
Arduino: 2 digit 7 segment display with temperature sensor
Need help with attachinterrupt, it affects other functions under void loop
Can anyone help with passing serial command from arduino Mega 2560 to M6e reader. I am getting connecting error
NRF24 not receiving. Help needed
Arduino uno midi system exclusive
Expected '}' at end of input Arduino Nano Elegoo
Arduino code MAX30100 and DS18B20 doesn't work
Optical Bubble Sensor BE-A 401 (Panasonic)
Controlling a servo with 5 wires
Arduino UNO Quadcopter Schematics
How to maintain original data using strchr
Strange behavior in communication with arduino and Tcl/Tk
Unable to compile for esp32 dev board module
Linear Encoder (suspension diagnostics)
Can't get LED to flash (like an indicator / blinker) in this sketch
Striped lines instead of cymbols on startup program
RPM sensing withot causing delay in sketch?
Arduino Nano V3 only runs sketch correctly after hitting reset or starting serial monitor
DC motor with L293D not spinning
Need help with a project (5v .2amp fan system)
Arduino Mega2560 dosen't proccessing routine command in loop when it send a data via serial port the delay about about 100ms per sending poreccess
Does anyone know the solution for this one? it is already closed so i didnt see the solution. Sadly I am having the same problem
3DTouch Auto Leveling Sensor
I cannot read text correctly through the serial port
Urgent help needed to fix the temperature sensor
How to use SWITCH?
RF433 and FastLed, problems with condition
Help, error: expected constructor, destructor, or type conversion before '(' token
Codigo para modulo relé doble canal
I want help serial communication between arduino and python
Simple keyboard string read won't work on Mega
Error compiling for board Arduino Nano 33 BLE : The paging file is too small for this operation to complete
ESP32 Dev, reading a register of an I2C-Device
High Resolution Gyro Question
VMA340 Pulse sensor false data
Combinations of relay having delay
Beginners seeking help
[CORB] Arduino + NodeMCU (ESP8266) Daten können nicht abgerufen werden
Expected { at end of input
Sincronizar hora de RTC DS3231 con arduino UNo
Problems with int errors
Differential steering with stepper motors
Need help when i was open the aurduino file the massage reflect "error could not create the sketch"
Arduino Nano and Visual Show Automation
CAN BUS not displaying all data
Lcd display A015AN02
Unable to send RAW IR code to an AC
Working with DGS spec sensors and Arduino Mega board
Arduino code won't compile seeking help
Arduino based Oscilliscope
Need help whit code for ir controlled step motor
Can't send data to ESP8266 via arduino
NRF24L01+PA not working
L293d with PC fan
Looking for someone who can help me troubleshoot a project.
DC Motor Control using Mosfet
Brushless motor and code
Sainsmart 5 inch display, Compile errors
Need help printing 6 digit value after decimal point
Logging sensor data from BMP280 and BNO055
ESP01 8266 not responsive
Led strip flickering
Crgbarray not meshing with crgb in declarations
Hex serial data receiving problem
Flux Capacitor inside a Track car
High signal detected although nothing is connected
Interrupt execution delay
Error 1 Error compiling for board Arduino Uno
Assign static IP and set host name
How do you make an LED increase in blinks based total number of times a button has been pressed
How to alter the value of a signal via poti?
How do I make my potentiometer increase the sound of the buzzer?
Arduino pro mini te362 and nRF24L01+
How write sd card cvs in the next column
360 spin photography
Tft display draw number in reverse digit
Dk d kql wlw,sl docerl ;dlka s;okoq p;ke asmd; lask;do asd
How to use sendSMS sketch?
Getting rtc time and using this info to label data in sd card
Controlling a stirrer with RS232
Mega 2560 wiring question
Problem with pot
Multiple sensor thermostat
Stepper misses steps on low speeds
Esp32 lora PCF8574ap
Data too long for SD to Read?
Comparing analog signals
How to get the best from this forum feedback and comments
Using 2 sensors advice
Troubleshooting dc motor motion control
Problem ESP8266
I don't know how to read an entire word in the serial
Adding Millis to program in youtube
Invalid conversion from 'int' to 'uint8_t* {aka unsigned char*}' [-fpermissive]
Disable hall effects sensor
Arduinos UNO, SENSORs, LEDs maybe POINTs
Math problem "invalid conversion"
iBUSTelemetry.h compile error for STM32
Is it possible to manipulate arrays like this?
I have trouble with Problem with hc-05 bluetooth connection(Not sending message out through phone app)
How to control a servo motor using a PID control with input from current sensor. I am not so proficient in arduino and in coding so can anyone please help me. I want to create a closed loop using pid for controlling servo with current sensor acs70331
Eeprom address loction
Arduino nano 33 iot profibus
Decimal to binary converter
Arduino Mega with 2004 Lcd Screen problem
Not loading to LCD
Problem with Arduino, load cell and LED display
Serial communication between tfmini plus and mrk gsm 1400 doesnt work
ledPin was not declared in this scope, unsure why?
"Error compiling for board Arduino UNO" message
Magnetic strip card reader project
How do i compare a string if it has been entered two time using serial.read input?
How do i compare a string if it has been entered two time using serial.read input?
Error compiling Esp32 Wrover Board
DC Current Measurement using Resistor Shunt and OP AMP
Bluetooth Controlled Car Problems
Programming bipolar motor to specific number of steps
Data sent api server with ethernet 400 bad requests
Hexadecimal value divided by 2
Comparing strings
Help me connect my flutter with the bluetooth
Library for LoRa communication in Arduino Nano 33 Iot, Ble, etc
Tx pins not working on my feather
Arduino Limit switch Interfacing Visual Basic .NET
One button library long press
Error compiling for digispark board (default- 16.5mhz
It's been so long I've fprgotten what T do
Printing from an array which is a class member
Using Arduino with RS 485 Angle Sensor
DFPlayer not working after multiples loops
BMP280 newby pressure relay
Powering 12v linear actuators with L9110s
Matlab Fuzzy Logic Conversion to Arduino done but confused
Troubles with if statements in for loops
My RFID doesn't work with Arduino Mega 2560
Insert switch to lcd clock
Pairing W2821B Led's into individual Sudo Pixels
How to avoid a if statement running again and again until another else if or else statement becomes true in void loop
Can you please guide me about analog joystick ? Is it possible to control the directions and speed of two motors just like an RC Car movements with one joystick (VRx, VRy )
Help, my teacher sucks. i need a code
HC-05 serial passthrough
1.8 tft 128*160 lcd error
Check Wifi Status - Problem
2 Button to 1 PWM output
(Beginner) Help with light display
SMS send but no receive.. the available() function takes forever
MPU6050 troubleshooting
How to decode binary coming from the neurosky module?
Trying to fix expected primary-expression before ')' token
How to collect time data and export it into a .CSV file without an RTC module
STM32 nucleo 64 with ST VL53L1X TOF sensor
Error while verifying a code into Arduino mega board
Passing char to a function
NodeMcu v3 only works on laptop usb
Control servo motor with blender
Animated christmas house
digitalRead not working or am i doing something wrong?
I2C crashes when used in an interrupt routine
How to control led brightness with one keyboard button
Four-load cells to be used with arduino (for balance device)
Simple LED code needed for ambient lighting
Making a Servo spin for set amount of time
Can't ping Arduino Mega with Ethernet 2 shield
Countdown timer 16x2 lcd
Project 09 Motorized Pinwheel - Motor spins continuously
DHT11 and esp 32
Error while verifying a code into Arduino mega board
Exit status 1 expected initializer before '.' token
Wifi esp8266 error when use adafruit_neopixel
ESP32 DEV with Potentiometer, NEMA 17 Stepper Motor and A4988 Motor Driver
Why on my esp 13 the access point doesn't appear?
I am trying to complete a program but I am new in this world if someone can help me with the code I will be so thankfull. Thanks
Help whit code for a little project
Can a multiplexer handle more than one type of input<control surface.h>
Hi, I'm currently doing my first project and I am facing an error which tells me that there is an error compiling for the board
Expected ')' before string constant
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