Book Image

Raspberry Pi Zero Cookbook

Book Image

Raspberry Pi Zero Cookbook

Overview of this book

The Raspberry Pi Zero, one of the most inexpensive, fully-functional computers available, is a powerful and revolutionary product developed by the Raspberry Pi Foundation. The Raspberry Pi Zero opens up a new world for the makers out there. This book will give you expertise with the Raspberry Pi Zero, providing all the necessary recipes that will get you up and running. In this book, you will learn how to prepare your own circuits rather than buying the expensive add–ons available in the market. We start by showing you how to set up and manage the Pi Zero and then move on to configuring the hardware, running it with Linux, and programming it with Python scripts. Later, we integrate the Raspberry Pi Zero with sensors, motors, and other hardware. You will also get hands-on with interesting projects in media centers, IoT, and more.
Table of Contents (17 chapters)
Raspberry Pi Zero Cookbook
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

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!" 
     ...