Additionally, some pins have specialized functionality: • I2C: 4 (SDA) and 5 (SCL). Support I2C (TWI) communication using the Wire library (documentation on the 2 Wiring website).
Additionally, some pins have specialized functionality:• I2C: 4 (SDA) and 5 (SCL). Support I2C (TWI) communication using the Wire library (documentation on the 2 Wiring website).