Book Image

Mastering IOT

By : Colin Dow, Perry Lea
Book Image

Mastering IOT

By: Colin Dow, Perry Lea

Overview of this book

The Internet of Things (IoT) is the fastest growing technology market. Industries are embracing IoT technologies to improve operational expenses, product life, and people's well-being. We’ll begin our journey with an introduction to Raspberry Pi and quickly jump right into Python programming. We’ll learn all concepts through multiple projects, and then reinforce our learnings by creating an IoT robot car. We’ll examine modern sensor systems and focus on what their power and functionality can bring to our system. We’ll also gain insight into cloud and fog architectures, including the OpenFog standards. The Learning Path will conclude by discussing three forms of prevalent attacks and ways to improve the security of our IoT infrastructure. By the end of this Learning Path, we will have traversed the entire spectrum of technologies needed to build a successful IoT system, and will have the confidence to build, secure, and monitor our IoT infrastructure. This Learning Path includes content from the following Packt products: Internet of Things Programming Projects by Colin Dow Internet of Things for Architects by Perry Lea
Table of Contents (34 chapters)
Title Page
Copyright
About Packt
Contributors
Preface
Free Chapter
1
The IoT Story
Index

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 from the min_pulse_width and max_pulse_width values. The following code moves the servo to the minimum position and then the maximum position after 5 seconds:

  1. Open up Thonny from Application Menu | Programming | Thonny Python IDE.
  2. Click on the New icon to create a new file.
  1. Type...