Controlling a buzzer with an RPZ

We've done a lot with light, but what about sound? The RPZ can run a simple buzzer with ease.

Getting ready

All you will need here is a piezo buzzer, which is a commonly available electronic component.

How to do it...

1. The piezo buzzer circuit is about as simple as it gets. There are only two leads: one is assigned to a GPIO port, and the other to ground. We can use PWM to adjust the frequency.

   

2. The code is simple too. The following is the code to run a buzzer test from 0 to 1 MHz and back down. Enter the code and run it as piezo.py:

       #!/usr/bin/env python 
       # Raspberry Pi Zero Cookbook 
       # Chapter 6 - Piezo Buzzer Operation 
       import time 
       import RPi.GPIO as GPIO 
       GPIO.setmode(GPIO.BCM) 
       GPIO.setwarnings(False) 
       #Set up GPIO 21 as buzzer output 
       GPIO.setup(21, GPIO.OUT) 
    
       # No freq to start 
       buzzer1 = GPIO.PWM(21,0.5) 
       # Set Volume 
       buzzer1.start(50) 
       while True: 
           try: 
                   print "up!" 
    ...