Book Image

Hands-On Internet of Things with Blynk

By : Pradeeka Seneviratne
Book Image

Hands-On Internet of Things with Blynk

By: Pradeeka Seneviratne

Overview of this book

Blynk, known as the most user-friendly IoT platform, provides a way to build mobile applications in minutes. With the Blynk drag-n-drop mobile app builder, anyone can build amazing IoT applications with minimal resources and effort, on hardware ranging from prototyping platforms such as Arduino and Raspberry Pi 3 to industrial-grade ESP8266, Intel, Sierra Wireless, Particle, Texas Instruments, and a few others. This book uses Raspberry Pi as the main hardware platform and C/C++ to write sketches to build projects. The first part of this book shows how to set up a development environment with various hardware combinations and required software. Then you will build your first IoT application with Blynk using various hardware combinations and connectivity types such as Ethernet and Wi-Fi. Then you'll use and configure various widgets (control, display, notification, interface, time input, and some advanced widgets) with Blynk App Builder to build applications. Towards the end, you will learn how to connect with and use built-in sensors on Android and iOS mobile devices. Finally you will learn how to build a robot that can be controlled with a Blynk app through the Blynk cloud and personal server. By the end of this book, you will have hands-on experience building IoT applications using Blynk.
Table of Contents (10 chapters)


Most smartphones and tablets come with a built-in accelerometer. An accelerometer is an electromechanical device that measures acceleration, which is the rate of change of the velocity of the phone. It measures in meters per second squared (m/s2) or in G-forces (g). An accelerometer can sense either static or dynamic forces of acceleration:

  • Sense static forces, including gravity
  • Sense dynamic forces, including vibrations and movement

For your smartphone or tablet, accelerometers are useful for sensing vibrations in systems or for the orientation of applications.

The accelerometer on your smartphone measures linear acceleration along x, y, and z axes. Figure 6.1 shows the x, y, and z orientation axes relative to a typical Android mobile device:

Figure 6.1: x, y, and z orientation axes for smartphone (created by Freepik)

If you place the smartphone face-up on a...