Skip to main content

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:


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's set up the Blynk app:

  1. Create a New Project in BLYNK app.
  2. Write Project Name and Select NodeMCU from dropdown and WiFi as connection type.
  3. An AUTH token will be sent to your registered email, note this down.
  4. Tap on the screen and add the Eventor widget to the screen.
  5. Tap on the Eventor widget and click Add New Event.
  6. Select Time button and choose DAYS OF THE WEEK and START AT time and TIME ZONE. SET THE TIME, then tap OK.
  7. Now, select turn ON pin and add D5 pin as we have connected our relay to PIN D5. Tap OK to finalize your Start Event.
  8. Same way create a new event and select START time that will Switch OFF the relay at PIN D5.
We have completed the circuit and set up our BLYNK. Let's do some coding.

Code:


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 we can now close the app. The app will do rest.


And yes, the button we added in our previous (Smart Switch Project) still works like a charm. So, scheduled or manual, everything is awesome! Oh yeah!

We can now schedule our appliances to turn ON/OFF when ever we want with our time scheduled electric switch. That's what we call some good use of technology.

Suggestions and comments are always welcome. Feel Free!

Keep breaking, keep making!

Comments

  1. Where is the code? Not seeing it on the web page.

    ReplyDelete
    Replies
    1. Hi David, I have added the code. Thanks for mentioning it!

      Delete
  2. D5 Isn't an option on my version of Blynk, only virtual outputs V0, V1, etc.
    Any suggestions? Thanks

    ReplyDelete
    Replies
    1. Sorry, please disregard my previous question. I was using Timer instead of Eventor. Apparently Eventor still not available for iOS.

      Delete
  3. This comment has been removed by the author.

    ReplyDelete

Post a Comment

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…

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…