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Raspberry Pi 3 Projects for Java Programmers

You're reading from   Raspberry Pi 3 Projects for Java Programmers Get the most out of your Raspberry Pi 3 with Java

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Product type Paperback
Published in May 2017
Publisher Packt
ISBN-13 9781786462121
Length 286 pages
Edition 1st Edition
Languages
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Authors (3):
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Rajdeep Chandra Rajdeep Chandra
Author Profile Icon Rajdeep Chandra
Rajdeep Chandra
John Sirach John Sirach
Author Profile Icon John Sirach
John Sirach
Pradeeka Seneviratne Pradeeka Seneviratne
Author Profile Icon Pradeeka Seneviratne
Pradeeka Seneviratne
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Table of Contents (8) Chapters Close

Preface 1. Setting up Your Raspberry Pi 2. Automatic Light Switch Using Presence Detection FREE CHAPTER 3. A Social and Personal Digital Photo Frame 4. Integrating a Real-Time IoT Dashboard 5. Wireless Controlled Robot 6. Building a Multipurpose IoT Controller 7. Security Camera with Face Recognition

Reading and displaying the values from the LDR

Doing this needs some experimentation on the values we want to have, especially because everyone's definition of It is dark is different. Remember, the longer it takes for the pin to detect the high state, the darker it is.

Close all the tabs except the Main class, where we will be uncommenting the next example to run. Scroll to the main function where we will be commenting the runLcdExample(); and uncomment the runLdrExample(); method. This next method runs the example of how to measure light intensity. When the LDR is connected like in the previous directions, you are able to run the application again by pressing the Run button in the button bar. Take a look at the LCD display where we see different text appearing depending on the light intensity surrounding the LDR.

When there is a lot of light, the display could show information as shown in the following screenshot...

You have been reading a chapter from
Raspberry Pi 3 Projects for Java Programmers
Published in: May 2017
Publisher: Packt
ISBN-13: 9781786462121
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