User Manual

GPIO.output(relayPin, GPIO.LOW) # Set the pins of transistor as low level to actuate

the relay.

time.sleep(1) # wait for 1 second. Change the switching frequency of the relay by

changing this parameter. Note: Relay is a kind of metal dome formed in mechanical

structure. So its lifespan will be shortened under high-frequency using.

GPIO.output(relayPin, GPIO.HIGH) # Set the pins of the transistor as low level to

let the relay open.

time.sleep(1)

Now, connect a dev ice of high v oltage, and the relay will close and the LED will light up;

connect one of low voltage, and it will open and the LED will go out. In addition, you can

hear a ticktock caused by breaking normally close contact and closing normally open

contact.

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