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)

Labeled Value

The Labeled Value widget is very similar to the Value Display widget, but allows you to format the output the way you want. As an example, you can append the text C to the sensor values coming from a temperature sensor with the Labeled Value widget.

The Labeled Value widget supports both digital and virtual pins. You can add a Labeled Value widget to the Blynk app by tapping Labeled Value under DISPLAYS in the Widget Box.

After adding a Labeled Value widget, your canvas should look like this (see the following screenshot):

Labeled Value widget

Configuring a Labeled Value widget

You can get the configuration settings page for the Labeled Value widget by tapping the Labeled Value widget on the canvas. Following...