book

Learning Raspberry Pi

by Samarth Shah, Serge Schneider

April 2015

Beginner

258 pages

5h 30m

English

Packt Publishing

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What this book covers

Downloading the example codeDownloading the color images of this bookErrataPiracyQuestions
Getting to know your Raspberry PiDifferent types of operating systemsThe Raspbian OSThe Arch Linux ARM OSThe RISC OSOpenELEC and RaspbmcOther operating systemsCommand summary
NOOBS and BerryBootInstalling Raspbian using RAW imagesWriting an image using WindowsWriting an image using LinuxRaspbian OS interfaceExpanding the filesystemInstalling Raspbian using raspbian-ua-netinstPreparing the NetInstall on LinuxPreparing the NetInstall on WindowsPost-install configuration for Raspbian distribution
The SSH remote serverSecuring SSHTransferring filesX11 ForwardingMaintaining remote session using screenThe reverse SSHVirtual display using VNCShare the keyboard and mouse using Synergy
Adding PHP supportInstalling WordPress
Getting started with HTML, JavaScript, and jQueryAdding page content with HTMLCustomizing the visual appearanceAdding interactivity with JavaScriptSimplifying scripts with jQuery
SyntaxData typesDecoratorsModulesFlask
Creating the user interfaceWriting the backendConnecting the user interface to the backendSetting up MPD
Understanding the physics behind electronicsCharge, voltage, current, and resistance
Ohm's lawKirchhoff's lawKirchhoff's Current Law (KCL)Kirchhoff's Voltage Law (KVL)
ResistorsDiodesSwitchesIntegrated circuitsSensorsLCDWireBreadboardRaspberry Pi electronicsWiringPi
Setting up Raspberry PiUnderstanding HD44780-based LCDConnecting LCD pins and Raspberry Pi GPIO pinsScriptingThe __init__ functionThe clear functionThe cmd functionThe message function
Connecting LCD pins and Raspberry Pi GPIO pinsScripting
Connecting LCD pins, Raspberry Pi GPIO pins, and a speakerScripting
Introduction to robotics
Introduction to motorsIntroduction to multimeterRobotic baseLevel converterMotor driver ICH-BridgeThe Raspberry Pi cameraSetting up the cameraUsage of modulesTaking a pictureRecording a videoAn Ultrasonic sensorThe Raspberry Pi batteryThe Raspberry Pi Wi-Fi module
Calculating distance using an ultrasonic sensorSetting up Raspberry PiConnecting ultrasonic sensors pins and Raspberry Pi pinsScriptingDisplaying live feed from the Raspberry Pi camera moduleSetting up Raspberry PiConnecting the Raspberry Pi and Raspberry Pi camera moduleScriptingDeveloping a remote-controlled robot using Raspberry PiSetting up Raspberry PiConnecting Raspberry Pi pins and robotScriptingCreating a user interface for controlling the robotControlling the movement of the robotInitializationRobot movementForwardOthersServer files that can control the Raspberry Pi GPIOMerging everythingConnectionScriptingUpdating the user interfaceUpdating server-related files
What is image processing?Images and types of imagesThe grayscale imageColor/RGBImage formatsApplications of image processing
Introduction to OpenCVInstallationThe first approachThe second approach
Reading and opening an imageSaving the image in other formatsSaving the image as a grayscale imagePixel-related operation on the imageAccessing and modifying pixel valuesAccessing image propertiesArithmetic operations on the imageImage additionImage blendingReading and opening a video
Taking time-lapse picturesMerging images into a video
Setting upSetting up Raspberry PiGetting Twitter Access keysScripting
Important image processing operationsThe image smoothing filterAveragingGaussian filteringMedian filteringBilateral filteringMorphological operationsErosionDilationOpeningClosing
Edge detectionBackground subtractionBackgroundSubtractorMOGBackgroundSubtractorMOG2
Object detection algorithmFace detectionEye detection
The track object positionOpenReliefCapabilitiesTechnical specificationsTwitter-enabled surveillance systems
TroubleshootingPower/booting/installationThe LED status and their interpretationThe red Power LED does not turn ON, nothing gets displayed on screenThe red power LED is blinkingThe red power LED is ON, the green LED does not flash, and nothing gets displayed on screenThe green LED blinks in a specific patternA colored splash screen stays foreverKernel panic on bootRaspberry Pi shuts down after booting upInputsUSB webcamNetworkingSoundThe Raspberry Pi cameraRaspiStill does not work, no image is takenDisplayFirmware updatesManual disk resize
Play MP3 filesRemove boot messagesRemove the Raspberry Pi logo from boot screenRemove unnecessary files from Raspberry PiShow all/hidden folders/fileShow a list of Python modules installed on systemsRaspberry Pi board info / CPU infoOverclock Raspberry Pi without voiding warrantyFreeing up RAM on Raspberry PiSet memory split between ARM and GPU in Raspberry PiCapture a screenshot using Raspberry PiFind the IP address of the Raspberry PiBuy a Raspberry Pi caseMake your own Raspberry Pi caseUse Chrome browser in Raspberry PiShut down your Raspberry PiI would like to connect x device to my Raspberry Pi. How can I be sure it is going to work?Some useful commands
ProjectsThe touchscreen car dashboardA talking book playerThe Morse code transmitterThe automated pet feederHome automation system using Raspberry Pi and ArduinoFace-recognizing safe with Raspberry PiSupercomputerUseful resources

Content preview from Learning Raspberry Pi

Chapter 3. Introduction to Electronics

As previously stated many times in this book, the true value of Raspberry Pi comes from its flexibility. This stands true for the electronics, where the General Purpose input/output (GPIO) pins allow Raspberry Pi to connect to different sensors and electronic components. In plain English, this means that the GPIO pins connect Raspberry Pi to the real world.

In this chapter, you will learn the basic laws of electronics, which is of absolute importance for creating electronics projects with your Raspberry Pi. Along with this, you will be introduced to various electronics components that will be used in the later part of this chapter to make an e-mail notifier and alarm clock. In this chapter, we will cover the ...