Book Image

Raspberry Pi By Example

By : Arush Kakkar
Book Image

Raspberry Pi By Example

By: Arush Kakkar

Overview of this book

Want to put your Raspberry Pi through its paces right out of the box? This tutorial guide is designed to get you learning all the tricks of the Raspberry Pi through building complete, hands-on hardware projects. Speed through the basics and then dive right in to development! Discover that you can do almost anything with your Raspberry Pi with a taste of almost everything. Get started with Pi Gaming as you learn how to set up Minecraft, and then program your own game with the help of Pygame. Turn the Pi into your own home security system with complete guidance on setting up a webcam spy camera and OpenCV computer vision for image recognition capabilities. Get to grips with GPIO programming to make a Pi-based glowing LED system, build a complete functioning motion tracker, and more. Finally, get ready to tackle projects that push your Pi to its limits. Construct a complete Internet of Things home automation system with the Raspberry Pi to control your house via Twitter; turn your Pi into a super-computer through linking multiple boards into a cluster and then add in advanced network capabilities for super speedy processing!
Table of Contents (22 chapters)
Raspberry Pi By Example
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Building an LED Blinker


For this project, you will require a humble low-power LED with the color of your choice, which can be obtained at your local hardware store or can be ordered online. The Raspberry Pi will act as both the switch and the power supply. In fact, we will power and switch the LED from the same output pin. The complete code and the wiring diagram has been given here. We will learn the code line by line following the diagram. Connect your LED to the Raspberry Pi, as shown. In an LED, the longer leg is the positive pin by convention, and the shorter leg has negative polarity. So take care to connect it the right way, or it might get damaged:

import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BOARD)
GPIO.setup(7, GPIO.OUT)

def Blink(speed):
    GPIO.output(7,True)
    time.sleep(speed)
    GPIO.output(7,False)
    time.sleep(speed)
    GPIO.cleanup()

Blink(1)

Once you've connected the LED as shown, go ahead and save the code as prog1.py, and execute the following command...