i2c

I2C (Inter-Integrated Circuit)

Synchronous serial protocol using only 2 wires: SDA (data) + SCL (clock).

• Supports up to 1008 peripheral devices on the same bus
• Each device has a unique hexadecimal address
• Slower than SPI but simpler wiring (only 2 wires vs 4+)
• Detect devices: i2cdetect -y 1

Python: smbus2 library

from smbus2 import SMBus
with SMBus(1) as bus:
    b = bus.read_byte_data(addr, register)

Devices in course: AHT20 sensor, accelerometer, light sensor, LCD driver.

See Also

• Serial Protocols topic