hello hello hello

Community General Discussion
1

Hi,
I'm 42 yo.
I'm getting started with Arduino using an ELEGOO starter kit including MEGA 2560R3.

My objectives are:

  1. learn how to manage my Arduino and accessories.
  2. learn C++ code
  3. start a domotic project

Best regards
Ludo

2

@ludo-44

Your topic was Moved to it's current location / section as it is more suitable.

Could you also take a few moments to Learn How To Use The Forum.
Other general help and troubleshooting advice can be found here.
It will help you get the best out of the forum in the future.

3

I would like to recommend you take the first step on Arduino - Hello World program.
Good luck!

4

Thank you for those recommandations! :wink:

5

Youngster !

Please do all your homework :wink:

How to use this forum:
https://forum.arduino.cc/index.php?topic=149014.0

Listing of downloadable 'Arduino PDFs' :
Either Google >>>- - - - > arduino filetype: pdf
Or
https://www.google.ca/search?q=arduino+filetype%3A+pdf&rlz=1C9BKJA_enCA739CA739&oq=arduino+filetype%3A+pdf&aqs=chrome..69i57j69i65.1385j0j7&hl=en-US&sourceid=chrome-mobile&ie=UTF-8

Listing of downloadable 'C++ PDFs' :
Either Google >>>- - - - > C++ filetype: pdf
Or
https://www.google.ca/search?q=c%2B%2B+filetype%3A+pdf&rlz=1C9BKJA_enCA739CA739&oq=c%2B%2B+filetype%3A+pdf&aqs=chrome..69i57.22790j0j7&hl=en-US&sourceid=chrome-mobile&ie=UTF-8

Arduino cheat sheet:

Watch these:
Arduino programming syntax:

Arduino arithmetic operators:

Arduino control flow:

Arduino data types:

Understanding Destructive LC Voltage Spikes:

OR

Why MOSFET gate resistors:

Some things to read

LCD information:

OR

Reading a schematic:
https://learn.sparkfun.com/tutorials/how-to-read-a-schematic

Language Reference:

Foundations:

How and Why to avoid delay():
http://playground.arduino.cc/Code/AvoidDelay

Demonstration code for several things at the same time.
http://forum.arduino.cc/index.php?topic=223286.0

Multitasking:
Part 1:

Part 2:

Part 3:

Sparkfun Tutorials:
https://learn.sparkfun.com/tutorials?page=all

Micro Controllers:

Useful links:
https://forum.arduino.cc/index.php?topic=384198.0

Arduino programming traps, tips and style guide:

Call for useful programming discussions
https://forum.arduino.cc/index.php?topic=383980.0

Jeremy Blume:

Arduino products:

Motors/MOSFETs

Switches:

Share tips you have come across, 500+ posts:
https://forum.arduino.cc/index.php?topic=445951.0

Images from above:
https://www.google.com/search?q=“Share+tips+you+have”+larryD+site:https://forum.arduino.cc&prmd=nmvi&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiJw-zu68ncAhXPGTQIHWCDCNwQ_AUIFCgE&biw=1024&bih=653

Debug discussion:
https://forum.arduino.cc/index.php?topic=215334.msg1575801#msg1575801

Frequently Asked Questions:
https://www.arduino.cc/en/main/FAQ#toc10

Number 'type's.

  • boolean (8 bit) - simple logical true/false, Arduino does not use single bits for bool
  • byte (8 bit) - unsigned number from 0 to 255
  • char (8 bit) - signed number from -128 to 127. The compiler will attempt to interpret this data type as a character in some circumstances, which may yield unexpected results
  • unsigned char (8 bit) - same as 'byte'; if this is what you're after, you should use 'byte' instead, for reasons of clarity
  • word (16 bit) - unsigned number from 0 to 65535
  • unsigned int (16 bit)- the same as 'word'. Use 'word' instead for clarity and brevity
  • int (16 bit) - signed number from -32768 to 32767. This is most commonly what you see used for general purpose variables in Arduino example code provided with the IDE
  • unsigned long (32 bit) - unsigned number from 0 to 4,294,967,295. The most common usage of this is to store the result of the millis() function, which returns the number of milliseconds the current code has been running
  • long (32 bit) - signed number from -2,147,483,648 to 2,147,483,647
    float (32 bit) - signed number from -3.4028235E38 to 3.4028235E38. Floating point on the Arduino is not native; the compiler has to jump through hoops to make it work. If you can avoid it, you should. We'll touch on this later. Sparkfun.

You select the 'type' best suited for your variables.

ex:

  • your variable does not change and it defines a pin on the Arduino. const byte limitSwitchPin = 34;
  • since an analog variable can be 0 to 1023, a byte will not do, you can select 'int'. int temperature;
  • if your variable needs to be within -64 to +64 a 'char' will do nicely. char joystick;
  • if your variable is used for ASCII then you need type 'char', char myText[] = {"Raspberry Pie Smells"};
  • if your variable enables some code then boolean can be used. boolean enableFlag = false;
  • millis() returns the time in ms since rebooting, unsigned long currentTime = millis();
    etc.

Oh, and have fun too :slight_smile: !