实例介绍
【实例简介】Raspberry Pi 3 Projects for Java Programmers
【实例截图】
【核心代码】
Table of Contents
Preface
1
Chapter 1: Setting up Your Raspberry Pi
7
Getting started with the Raspberry Pi
7
Getting a compatible SD card
8
Preparing and formatting the SD card
9
Installing Raspbian
11
Configuring Raspbian
13
Installing Java
21
Installing and preparing the NetBeans Java editor
27
Our first remote Java application
32
Running our application on the Raspberry Pi
36
Summary
38
Chapter 2: Automatic Light Switch Using Presence Detection
39
Introduction to and installing Fritzing
40
Billing of materials
42
How to emulate reading analog values on digital pins
42
Starting our project and installing the necessary libraries
43
The Pi4J libraries
44
Adding the HD44780-compatible 16x2 character display
45
Showing data on the HD44780-compatible display
48
Adding the light-dependent resistor to the setup
55
Reading and displaying the values from the LDR
57
Using digital out to switch and display a relay status
63
Automatic switch based on environment lighting
67
Using the Bluetooth chip on the Raspberry Pi
71
Bluetooth device discovery
72
Putting it all together, our first automation project
77
Summary
82
Chapter 3: A Social and Personal Digital Photo Frame
83
Bill of materials
84
Waveshare HDMI display
84
Assembling with Raspberry Pi
85
Selecting video source
87[ ii ]
Correcting display resolution
89
Mounting on desktop
93
Connecting with Flickr
94
Obtaining a Flickr API key
94
Creating an album
97
Finding Flickr photoset_id
98
REST request format
99
Invoking flickr.test.echo
100
Invoking flickr.photosets.getPhotos
100
Constructing photo source URL
101
Writing Java program
103
Accessing Flickr image URL
106
Installing feh on Raspberry Pi
111
Scheduling your application
113
Writing shell script for Java application
113
Testing the digital_photo_frame.sh with the terminal
114
Scheduling digital_photo_frame.sh with crontab
115
Testing digital_photo_frame.sh with crontab
115
Writing shell script for slideshow
116
Starting digital photo frame on Raspberry Pi boot
116
Photo frame in action
117
Summary
117
Chapter 4: Integrating a Real-Time IoT Dashboard
118
Adafruit IO
119
Bill of materials
119
Sign in with Adafruit IO
120
Finding your AIO key
121
Creating news feed
122
Understanding topics
127
Creating a dashboard
128
Creating a block on a dashboard
131
Raspberry Pi and I2C pins
136
Connecting an I2C-compatible sensor to the Raspberry Pi
137
Serial bus addresses
139
Configuring the Raspberry Pi to use I2C
141
Searching I2C devices attached to the Raspberry Pi
146
Accessing I2C with Pi4J
149
Eclipse Paho Java client
150
Writing Java program to publish data to a feed
150
Publishing temperature sensor data
154
Publishing system information
159
Subscribing to a feed
160[ iii ]
Creating a toggle button on Adafruit dashboard
161
Subscribe to the button feed
164
Controlling an LED from button feed
166
Summary
169
Chapter 5: Wireless Controlled Robot
170
Prerequisites
171
The Zumo chassis kit
171
Assembling Zumo chassis
172
Preparing motors to reducing the effects of electrical noise
173
Attaching Raspberry Pi to Zumo chassis
174
Building the circuit
175
Wiring them together
180
Moving and turning
181
Moving
182
Turning
183
Swing turn
187
Writing your Java program
192
Running and testing your Java program
202
Summary
206
Chapter 6: Building a Multipurpose IoT Controller
207
Prerequisites
208
Preparing your Raspberry Pi board
208
Installing and configuring Jetty servelet engine
208
Writing your first Java web application
212
Creating a Maven project from Archetype
212
Creating a servlet
222
Copying iot.war file to the Raspberry Pi
231
Summary
234
Chapter 7: Security Camera with Face Recognition
235
Raspberry Pi camera module
236
Connecting the camera module to the Raspberry Pi
238
OpenCV
239
Downloading and installing OpenCV on Windows
239
Creating the Java project
240
Adding the OpenCV library to your Java project
241
Downloading and building OpenCV on Raspberry Pi
249
Working with video
252
Facial recognition
260
Build and run
267[ iv ]
Summary
268
Index
269
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