Help With Arduino UNO R3

Projects Networking, Protocols, and Devices
1

I am working in a mode 1

  • Mode 1: USB Serial connected to ATMega328 for both programming and serial communication
  • Mode 2: USB Serial connected to ESP8266 for programming
  • Mode 3: USB Serial connected to ESP8266 for serial communication
  • Mode 4: ATMega328 and ESP8266 serial connected together for serial communication

Now i want to send a data from uno r3 to my website is that possible if yes how can i do that i need help regarding this for my college project
Issue is how i can connect uno R3 with my home wifi

2

The UNO uses 5 volt level of signals. The ESP usuallly uses 3.3 volt. Don't send 5 volt signals to a 3.3 volt device without level shifting. Sending 3.3 volt signals to a 5 volt device is okey.

3

@Railroader

I think OP has one of those boards that have an ESP8266 integrated on an Uno board. So level conversions should be catered for.

2 Likes
4

Let's ask him/her

@webydev Please tell us exactly which Arduino board you have

1 Like
5

OP is using ESP8266 whose IO pins are practically tolerant to 5V logic; hence, it can be directly connected with UNOR3 without level shifters.

6

So not completely tolerant to 5V then

1 Like
7

We have to use level shifter! (But, I operate without level shifter.)

Warning from Google:
ESP8266 pins are generally not considered 5V tolerant; while some evidence suggests they might tolerate a slightly higher voltage than their 3.3V operating voltage, directly connecting them to a 5V source can potentially damage the chip, so it's best practice to use a voltage divider when interfacing with 5V circuits.

8

As far as I know it's a myth that was debunked by Espressif.

2 Likes
9

Post a picture of your board.

10
  • You need proper hardware to do this.
  • The least expensive (less than $10.00) and most efficient way is to use a ESP32 using a WIFI connection and hosting the WEB page.
11

IMG20250127170434
IMG202501271704341920×2560 452 KB

IMG20250127170443
IMG202501271704431920×2560 437 KB

This is the board i am using what i want to do is just send a data to a website from this board this is a custom board with atmega326 + esp8266

I followed this video

@GolamMostafa @UKHeliBob
Thanks for messaging...
Waiting for your reply

12

1. I assume that you have a Router in your home.
2. You have a semperature sensor (DS18B20) connected with UNOR3.
3. You want to transfer the temperaure data from UNOR3 to your ESP8266 using (say) UART Port.

4. Your ESP8266 as a Server will use its built-in WiFi to send the temperature data to your Mobile Phone via the Router.

5. Your Mobile Phone will monitor temperature as a Client.

WifiEsp8266
WifiEsp82661046×309 94 KB

Are you expecting to build a Project like above?

13

For clarification, your topic title refers to a Uno R3 but that is not the board that you have

14

It is a custom board with board ATMEGA and ESP8266

My Idea is to make a data sending from this board showing in the above images with my router to the website

15

So it is not the board that you posted pictures of

Please post a schematic of your actual board

16

@UKHeliBob Please check this image for the schematic

17

That is not an image of your custom board nor is it a schematic

18

@UKHeliBob Then i am really sorry i don't have apart from this
ATmega328p + ESP8266 i have both the chips in my board if you want i can provide you more clear images

19

You previously said

Who designed and built it and where did you get it from ?

20

@UKHeliBob

I am using this one