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)

Configuring Button widget with virtual pin

In this section, you will modify the Blynk app, LED Controller, by configuring a virtual pin:

  1. Go to edit mode by tapping the stop icon if you're already in play mode.
  2. Tap the Button widget.
  3. On the Button Settings page, tap GP 18 under OUTPUT. Scroll down and choose Virtual from the left-hand part of the list. Then, scroll down and choose V1 from the right-hand part of the list under PIN. Blynk provides 128 virtual pins for working with Raspberry Pi. Finally, tap OK.

  1. Now, your Button Settings page should look like this:
Button settings for virtual pin
  1. Tap the LEFT arrow on the toolbar. You will see the new button configured with the virtual pin V1:
Button configured with virtual pin V1

Now, you've successfully modified the Button widget, so it can write values to the virtual pin V1.