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Mastering Internet of Things

You're reading from   Mastering Internet of Things Design and create your own IoT applications using Raspberry Pi 3

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Product type Paperback
Published in Mar 2018
Publisher Packt
ISBN-13 9781788397483
Length 410 pages
Edition 1st Edition
Concepts
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Author (1):
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Peter Waher Peter Waher
Author Profile Icon Peter Waher
Peter Waher
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Toc

Table of Contents (18) Chapters Close

Preface 1. Preparing Our First Raspberry Pi Project FREE CHAPTER 2. Creating a Sensor to Measure Ambient Light 3. Creating an Actuator for Controlling Illumination 4. Publishing Information Using MQTT 5. Publishing Data Using HTTP 6. Creating Web Pages for Your Devices 7. Communicating More Efficiently Using CoAP 8. Interoperability 9. Social Interaction with Your Devices Using XMPP 10. The Controller 11. Product Life Cycle 12. Concentrators and Bridges 13. Using an Internet of Things Service Platform 14. IoT Harmonization 15. Security for the Internet of Things 16. Privacy 17. Other Books You May Enjoy

Plotting graphs

No sensor application is complete without plotting graphs. We can do this directly from the web interface hosted on the sensor itself. We have already defined a web page for it: /History.md. We first need to add the Waher.Script.Graphs NuGet package to the project. It adds graph plotting functions to our scripting engine. It uses the cross-platform SkiaSharp two-dimensional drawing package to do the actual drawing. We must just make sure to add the corresponding assemblies of Waher.Script and Waher.Script.Graphs to the types inventory when we initialize the application.

For a list of script syntax supported, including some extension libraries, see http://waher.se/Script.md.

Reading historical values from the database

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