Relay

The connection diagram for relay is shown below:

Relay connection

Relay

Arduino Uno

VCC

D13

VCC

5V

GND

GND

Controlling Relay State

import raspidevkit
import time

machine = raspidevkit.Machine()
arduino = machine.attach_arduino('/dev/ttyUSB0')
relay = arduino.attach_relay(13)
relay.turn_on()
time.sleep(3)
relay.turn_off()