I2C device not found troubleshooting

Projects Networking, Protocols, and Devices
1

I am stuck. I read all the forums "similar to", looked all around google, but still I get "No I2C devices found" from the I2C scanner.

I am trying to connect an Arduino Micro to an I2C display. I am not entirely sure but I think I have a display with an I2C module in the back (see bad picture and terrible schematics)

I connected SLC -> A5, SDA -> A4, connected the grounds of both Micro and i2c

I tried a few jumper cables but nothing is happening.

The I2C scanner is Arduino Playground - I2cScanner

See bad picture and worse fritzing schema here:

[Album] imgur.com
2

I see neither a bad picture nor terrible schematics. So it's impossible to tell whether your omission of connecting Vcc to 5V is relevant or not.

3

Sorry I accidentally send the pic before finishing the post

4

Those are not the i2c pins on a Micro.

2 Likes
5

I think @PaulRB nailed it. The Micro is a 32u4 board and SCL is on I/O 3 (PD0) and SDA is I/O 2 (PD1).

6

Thank you all for the replies!

I switches the pins and now the scanner finds it, thanks!

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