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Internet of Things Programming Projects

You're reading from   Internet of Things Programming Projects Build modern IoT solutions with the Raspberry Pi 3 and Python

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Product type Paperback
Published in Oct 2018
Publisher Packt
ISBN-13 9781789134803
Length 436 pages
Edition 1st Edition
Languages
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Author (1):
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Colin Dow Colin Dow
Author Profile Icon Colin Dow
Colin Dow
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Table of Contents (21) Chapters Close

Preface 1. Installing Raspbian on the Raspberry Pi FREE CHAPTER 2. Writing Python Programs Using Raspberry Pi 3. Using the GPIO to Connect to the Outside World 4. Subscribing to Web Services 5. Controlling a Servo with Python 6. Working with the Servo Control Code to Control an Analog Device 7. Setting Up a Raspberry Pi Web Server 8. Reading Raspberry Pi GPIO Sensor Data Using Python 9. Building a Home Security Dashboard 10. Publishing to Web Services 11. Creating a Doorbell Button Using Bluetooth 12. Enhancing Our IoT Doorbell 13. Introducing the Raspberry Pi Robot Car 14. Controlling the Robot Car Using Python 15. Connecting Sensory Inputs from the Robot Car to the Web 16. Controlling the Robot Car with Web Service Calls 17. Building the JavaScript Client 18. Putting It All Together 19. Assessments 20. Other Books You May Enjoy

Controlling the servo using weather data

We are close to building our IoT weather dashboard. The final steps involve controlling our servo position based on the weather data returned from the Yahoo! Weather web service and physically building a backdrop for our servo needle.

Correcting for servo range

As some of you may have noticed, your servo motor does not move a full 180 degrees from minimum to maximum. This is due to the minimum and maximum pulse widths of 1 ms and 2 ms set in GPIO Zero. To account for this difference, we must adjust the min_pulse_width and max_pulse_width properties accordingly when we instantiate a Servo object.

The following code does just that. The variable, servoCorrection, adds to and subtracts...

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