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!

Comments

Popular posts from this blog

Controlling Servo Motor with BLYNK app over WiFi

Hello Shippers, hope you are having a great time! Today, we are gonna build a simple project of controlling servo motor with BLYNK app over Wifi.
Overview: The slider on the blynk app will send a value to the NodeMCU/ESP8266 and this value will be written on PIN 8 and the servo rotates that much degrees. That's the way we are controlling servo motor. Ahaa!


Things we need:Hardware:Servo SG90NodeMCUMicroUSB cableJumper WiresSoftware:Arduino IDEBLYNK appCircuit:
Connections:D8 pin of NodeMCU connects to Command pin of Servo Motor.3V3 PIN of NodeMCU connects to Power PIN of Servo motor (usually RED one).GND PIN of NodeMCU connects to GND of servo motor (usually BLACK one). Simple connections, huh!
BLYNK app Setup on phone:Create a New Project in BLYNK app.Write Project Name and Select ESP8266 or NodeMCU from dropdown.An AUTH token will be sent to your registered email, note this down.Tap on the screen and add a SLIDER widget on the screen.Tap on the Widget, select Digital PIN 8 and Start…

Time scheduled electric switch controlled with Blynk app

Most of the times when we go out of home for some days, we think of having some device that could switch ON/OFF (let's say) Refrigerator (or any other important appliance)for some hours during the day. Today, we are going to make such time scheduled electric switch which switches ON/OFF at times which we set the in our Blynk app. Woah!

Let's begin!
Things we need:
Hardware:5V relayNodeMCUJumper wiresBreadboard3V3 and 5V power sourceElectrical WiresSoftware:Arduino IDEBLYNK app It's circuit is same as we have created for our Smart Switch. So, if you already have that circuit set up, go ahead with Blynk app set up and Start playing.
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.Let…

Color changing LED Strip with BLYNK app

Hello Sailors! Have you ever thought to own a color changing LED strip, so you could change it's color based on your mood, yes I am taking about Mood Light. Today,  we are back with one more interesting IOT project where are going to create a mood light(LED strip) with BLYNK app. Sounds Romantic, hmm!

Let's Rock' n Roll.
Overview: BLYNK app will send message to your NodeMCU over Wifi, these signals will be translated by NodeMCU and LED strip will change color as received in the message.
Things we need:Hardware:SMD 5050 Led Strip (Color changing LED strip)Jumper WiresTIP 120/122 NPN transistor Buying this from local shops would be a better option12V & 3.3V SupplySoftware:Arduino IDEBLYNK AppCircuit: Connections:D5 pin is connected to TIP 120 NPN(U1) transistor's Base pin.D6 pin to Base pin of U2.D7 pin to Base pin of U3.U1, U2 and U3's Collector pins are connected to respective LED color pinU1, U2 and U3's Emitter pins are grounded. Grounded, That's sad!No…