Skip to main content

Control switch over internet with BLYNK

Yo... yo... yo... Shippers! It's been quite a few days that we have not built anything awesome. Come let's gather up the stuff and get ready to roll. Today, we are going to control switch over internet using our very precious BLYNK app, let's call this Smart Switch. Cool!

Overview:

The 5V relay connected to D5 pin of NodeMCU goes ON when D5 pin is set LOW and relay goes OFF when D5 pin is set HIGH.

We are simply going to set D5 pin HIGH to turn ON the appliance and D5 as LOW to turn OFF the appliance, considering the neutral wire is passing through the NC and COM of the relay.

Stuff required:

Circuit:


Connections:

  • D5 pin of NodeMCU connects to IN1 pin of 5V relay.
  • 3V3 of NodeMCU connects to 3V3 powers source and GND to GND.
  • Vcc of relay connects to 5V source and GND to GND.
  • Live wire is connected directly to appliance.
  • Neutral wire from source comes to relay NC pin and another wire goes out from COM pin which is connected to the appliance.
Technically, we are connecting our switch on the neutral wire of the appliance, which is turning ON/OFF the appliance. Simple!

Let's set up our BLYNK app:

  • Create a New Project in BLYNK app.
  • Write Project Name and Select NodeMCU from dropdown.
  • An AUTH token will be sent to your registered email, note this down.
  • Tap on the screen and add a Button.
  • Tap on the Widget and select D5 pin, then change MODE to SWITCH.
Code:We have completed the circuit and set up our BLYNK. Let's do some coding.

Make sure to change the AUTH_KEY, SSID and PASSWORD before uploading the code to NodeMCU.

Upload and Play:

Connect NodeMCU using the MicroUSB cable and upload the code using Arduino IDE.

Once uploaded, click Play button on the BLYNK app and start turning ON/OFF your devices from anywhere in the world.

Oh Yeah! That's it for now, Shippers. See you in the next awesome IOT project.

Keep breaking, keep making!
Labels:

Comments

Post a Comment

Popular posts from this blog

Build a REST API using Node and Express.js

Hello Sailors, if you are a programmer you would have heard about APIs or have developed APIs in JAVA, Python or any language. Today, we are going to build an API which sends random nutrition tips as response, with Nodejs and Express.js. Sounds interesting! What is an API? API stands for Application Program Interface. Ho ho ho! this just made my life, what an explanation! Well, an API is a set of functions and procedures that allow you to create applications which access the data of an application or service. Why do we need an API? When we want to build an android application, a web application and a desktop application because there are different type of users, so instead of building separate logic for all of these applications, we will build an API and all these applications will consume this API and serves the purpose. Here's another example : You have built a printer which prints great on paper but still no one buys it because you do not provide them any tool ...
Post a Comment
Read more

Setup Mosquitto MQTT broker in Windows

MQTT (Message Queueing Telemetry Transport) is a Client Server messaging transport protocol. It provides a lightweight method of carrying messages using a publish/subscribe model. The pub/sub model being lighweight makes it suitable for IOT messaging with low power devices, sensors, phones or microcontrollers. How MQTT works? MQTT follows publish/subscribe model which is alternative to server-client model where client communicates directly with server. The pub/sub model defines the client which send a message(publisher) to another client which received that message(subscriber). The subscriber and publisher are unaware of the presence of each other. The main part, which we call the Broker, which our both publisher and subscriber are aware of, filters all the coming messages and distributes them respectively. Now we know what is MQTT and how it works. Let's dive in to set this up on Windows 7/8/10. Mosquitto: This is an open source message broker used for handling lightwe...
Post a Comment
Read more

Karna - The hapless Mahabharata Warrior

“Karma is a bitch.”  These must be the truest words ever spoken. Karna was so unfortunate because of his Karma. In his previous birth, Karna was a demon by name “Dambhodbhava”. He was an Asura, who like every other asura, wanted to be powerful and had a ridiculous desire to become Immortal. So, one fine day, he started to pray for Sun God “Surya Deva”. Lord Surya was impressed by his devotion and intensity of his “ Tapas  (Deep meditation)” and asked him what his desire was. Dambhodbhava who was greedy for power asked Surya to grant him the one boon no one could grant i.e. Immortality. “Everything that takes birth must die” . This was the First Law Of the Universe and Surya told the asura, he can ask for anything except Immortality. Dambodhbhava was crestfallen as he thought that all the Tapas was a waste of time. Dambodhbhava unwilling to give up, was lost in thought for a long time. He was determined to go home immortal one way or the other. So, he ...
2 comments
Read more