Book Image

Internet of Things Programming with JavaScript

Book Image

Internet of Things Programming with JavaScript

Overview of this book

The Internet of Things is taking the tech world by storm, and JavaScript is at its helm. This book will get you to grips with this exciting new technology. Where do Node.js, HTML5 and Windows 10 IoT Core come in with JavaScript and IoT? Why Raspberry Pi Zero rather than Arduino? How do you configure and build an IoT network from scratch? All your IoT JavaScript questions are answered in this book.
Table of Contents (15 chapters)
Internet of Things Programming with JavaScript
Credits
About the Author
www.packtpub.com
Customer Feedback
Preface

Raspberry Pi GPIO header


The following screenshot is a chart of the GPIO pins of the Raspberry Pi Zero. In this case, we will use the SPI configuration interface (SPI_MOSI, SPI_MISO, SPI_CLK, SPI_CE0_N):

The following diagram shows the name of the pins of the MCP3008 chip that you connect to the Raspberry Pi: 

The following image shows the temperature sensor:

You need to connect the following pins according to the next description:

  • VDD to 3.3 volts

  • VREF to 3.3 volts from the Raspberry Pi Zero

  • Pin AGND to GND

  • Pin CLK (clock) to GPIO11 of the Raspberry Pi

  • DOUT to GPIO9

  • Pin DIN to GPIO10

  • Pin CS to GPIO8 and the pin

  • Pin the MCP3008D GND to Ground

This connection is represented in the following figure:

The following image shows the connections of the sensor to the ADC MCP3008 and the Raspberry Pi:

Reading the data with a Python script

In the next section, you will create the MCP3008.py file; you need to follow the next steps:

  1. Open the terminal on your Raspberry Pi Zero.

  2. Enter the interface in your Pi terminal...