Let's Make Robots!

Arduino 328 || Mega 2560 + I2C = ?


Mega 2560 on top left and 328 on lower right.


The connection in between UNO and I2C/LCD. Only showing cubes...


MEGA with LCD work fine!


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Are there pull up resistors on one board but not the other? If using internal pull-ups, are they turned on?

I don't really see any pull up resistors but some jumpers for RS485 only.