I2C connector pinout

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For the interconnect between I2C masters and the I2C expansion boards BitWizard uses a 4-pin I2C cable.


The connector is laid out as follows:

pin function remark
1 GND Power Ground
2 SDA Serial I2C Data
3 SCK Serial I2C Clock
4 VCC Power 5V.


Connecting the BitWizard boards to an Arduino

pin function arduino pin Arduino Mega
1 GND GND GND
2 SDA A4 (Analog input 4) Digital 20
3 SCK A5 (analog input 5) Digital 21
4 VCC VCC VCC

You could use other pins, but then you have to make a software I2C implementation. This is not too difficult, but might be neccesary if something else is already on the I2C pins.