I got a Arduino Robot recently and is trying to use its I2C function, but the thing is I cannot find correct I2C pins.
I found a layout here(Grappling with the Arduino Robot Control Board - Grappling with electronics), but it doesn't look right.
I turned on Robot and measured 4 I2C pins, there is 5V between SDA(+5V) and SCL(0V), other two pins are also +5V compare to SCL, that means there is no GND for I2C.
Is that right? Because all tutorials I found they connect SDA, SCL and GND between two boards.
Anyone can help me? thanks!