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Full Stack Web Development with Raspberry Pi 3

You're reading from   Full Stack Web Development with Raspberry Pi 3 Build complex web applications with a portable computer

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Product type Paperback
Published in Aug 2017
Publisher Packt
ISBN-13 9781788295895
Length 214 pages
Edition 1st Edition
Languages
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Author (1):
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Soham Kamani Soham Kamani
Author Profile Icon Soham Kamani
Soham Kamani
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Table of Contents (13) Chapters Close

Preface 1. Getting Started on the Raspberry Pi FREE CHAPTER 2. Getting Up-and-Running with Web Development on the Raspberry Pi 3. Running a Node Server on the Pi 4. Extracting Information from the GPIO Pins 5. Retrieving Sensor Readings from the Server 6. Creating a Web Page to Display Sensor Data 7. Enhancing Our UI - Using Interactive Charts 8. SQLite - The Fast and Portable Database 9. Integrating SQLite into Our Application 10. Making our Application Real Time with Web Sockets 11. Deploying our application to Firebase 12. Using Firebase APIs to Update Our Application

Integrating sensor data into our charts

The goal of this section is to have our sensor data reflect in our charts. We know that readings are measured every two seconds. This means that we will also have to update our charts every two seconds. This is a slightly different situation when compared to the sample chart we created earlier because there are some assumptions that we didn't consider:

  • The constant readings from the sensor require that our chart be dynamic. The values plotted have to change every time a new reading comes.
  • We must choose a sensible scale. Our sample chart had values from 12 to 23. In the real world, temperature and humidity readings rarely change that often or that drastically, especially when we are measuring on a per-second timescale.

Fortunately, the Chart.js library has features to take care of both of these new findings. Let's modify our...

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