BCM 2 (I2C Data)
|I2C1 SDA||SMI SA3||DPI VSYNC||AVEOUT VSYNC||AVEIN VSYNC|
- Physical pin 3
- BCM pin 2
- Wiring Pi pin 8
- BCM pin 0 on Rev 1 ( very early ) Pi
SDA (i2c Data) is one of the i2c pins on the Pi, learn more about i2c.
SDA includes a fixed, 1.8 kohms pull-up to 3.3v, which means this pin is not suitable for use as a general purpose IO where no pullup resistor is desired.