buzzer.md

Buzzers

There are two main types of buzzer: active and passive.

A passive buzzer emits a tone when a voltage is applied across it. It also requires a specific signal to generate a variety of tones. The active buzzers are a lot simpler to use, so these are covered here.

Connecting a buzzer

An active buzzer can be connected just like an LED, but as they are a little more robust, you won't be needing a resistor to protect them.

Set up the circuit as shown below:

1. Add Buzzer to the from gpiozero import... line:

   from gpiozero import Buzzer
   from time import sleep

2. Add a line below your creation of button and lights to add a Buzzer object:

   buzzer = Buzzer(17)

3. In GPIO Zero, a Buzzer works exactly like an LED, so try adding a buzzer.on() and buzzer.off() into your loop:

   while True:
       buzzer.on()
       sleep(1)
       buzzer.off()
   	sleep(1)

4. A Buzzer has a beep() method which works like an LED's blink. Try it out:

   while True:
       buzzer.beep()

What Next?

• Continue to the next worksheet on building a traffic lights system using GPIO Zero.