I2C troubleshooting please help!

Projects General Guidance
1

Greetings,

I am experiencing issues with all of my arduino boards I have 2 unos and 3 different knock off minis all of which will not find/communicate with any I2c devices. In the past all of the boards were used with a heart rate monitor and OLED display with no issues. They are being used for a school project and over my spring break I ran into this issue. I'm not sure what I did to have them all stop working. I have tried reinstalling Arduino IDE 2.0.4 and installed the legacy version 1.8 but it made no difference. I've tried older verions of Adafruit SSD1306 libraries, using a second computer to upload codes, using 4.7k pull up resistors on SCL and SDA. Any help is appreciated!

2

Testing I2C

Before doing anything else (having connected the board to your Arduino of course) run the Wire- I2C Scanner sketch. That will tell you the address of the board you have connected. For a BMP280 its 0X77 (with SDO = Vcc) or 0X76 (SDO = 0V).

Can you post your code (or the relevant bits)

3

Show us a schematic of how they're being used? A universal problem like that makes me think you're making a mistake with power, or misconnecting clock and data consistently.

4

Please send a mod request to move this into the right sub forum, flag icon under the post. This one is for IDE issues.