IoT & Hardware
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You're reading from  Getting Started with Raspberry Pi Zero

Product typeBook
Published inMar 2016
Reading LevelIntermediate
Publisher
ISBN-139781786469465
Edition1st Edition
Languages
Python
Tools
Raspberry Pi
Concepts
Single Board Computers
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Author (1)
Richard Grimmett
Richard Grimmett
author image
Richard Grimmett

Dr. Richard Grimmett has been fascinated by computers and electronics from his very first programming project, which used Fortran on punch cards. He has bachelor's and master's degrees in electrical engineering and a PhD in leadership studies. He also has 26 years of experience in the radar and telecommunications industries, and even has one of the original brick phones. He now teaches computer science and electrical engineering at Brigham Young University, Idaho, where his office is filled with his many robotics projects.
Read more about Richard Grimmett

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Adding a sonar sensor

The basic circuit you just built is a wonderful start. Now you'll interface a more complex device, a sonar sensor, with Raspberry Pi Zero. Here is a picture of the sonar sensor that you'll add:

The device is an HC-SR04 and they are available at most online electronics retailers. Now let's connect the device to Raspberry Pi Zero. In order to do this, first let's look at the layout of the GPIO pins on Raspberry Pi Zero:

You'll need to connect to the 5 volt connection of the Raspberry Pi Zero, pin 2. You also need to connect to the GND, which is pin 6 on Raspberry Pi. Pin 16 (GPIO 23) is used as an output trigger pin and pin 18 (GPIO 24) as an input to time the echo from the sonar sensor.

Note

Don't connect 5 volts as an input to any of the GPIO pins as this might cause damage.

Now that you know the pins you have to connect to, you'll connect the sonar sensor. However, there is a problem, as you can't connect the 5-volt return from the sonar sensor directly to the Raspberry...

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Getting Started with Raspberry Pi Zero
Published in: Mar 2016Publisher: ISBN-13: 9781786469465
© 2016 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Richard Grimmett

Dr. Richard Grimmett has been fascinated by computers and electronics from his very first programming project, which used Fortran on punch cards. He has bachelor's and master's degrees in electrical engineering and a PhD in leadership studies. He also has 26 years of experience in the radar and telecommunications industries, and even has one of the original brick phones. He now teaches computer science and electrical engineering at Brigham Young University, Idaho, where his office is filled with his many robotics projects.
Read more about Richard Grimmett

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