Hi all,
I needed a small layout, so I bought a small Arduino Mega 2560 Pro. Unfortunately the SDA and SCL pins are not labeled. I did not find a proper datasheet. But perhaps someone of you has used this board also? Are Pins 20 and 21, as it is on the Mega 2560 R3, the correct pins?
I attached a picture of the board.
Thank you - richard
If you have an I2C device, this would be very easy for you to test. I have not used a baord like this, but I see no reason for them to change the pin numbering!
Time to get your multimeter out and consult the 2560 datasheet 
It looks like a RobotDyn Mega 2560 PRO. If so, there is a pinout on their web site; you can find it under the documents tab on the first link.
