ESP32 Bluetooth Home Automation With IR Remote Control Relay | ESP32 Projects 2021

Introduction: ESP32 Bluetooth Home Automation With IR Remote Control Relay | ESP32 Projects 2021

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In this ESP32 project, I have shown how to make an ESP32 Bluetooth Home Automation system to control 8 home appliances with Bluetooth, IR remote, and manual switches. You don't need any internet connection for this project. During the article, I have shown all the steps to make this smart home system.

This ESP32 control smart relay has the following features:

  • Control home appliances with Bluetooth App from your smartphone.
  • Control home appliances with any IR remote.
  • Control home appliances with manual switches or Pushbutton.

If you don't want to use PCB, you can also make this IoT project using an 8-channel relay module, ESP32, and IR receiver sensor.


  • TSOP1838 IR receiver (with metallic case)
  • Relays 5v (SPDT) (8 no)
  • BC547 Transistors (8 no)
  • PC817 Optocuplors (8 no)
  • 510-ohm 0.25-watt Resistor (8 no) (R1 - R8)
  • 1k 0.25-watt Resistors (10 no) (R9 - R18)
  • LED 5-mm (10 no)
  • 1N4007 Diodes (8 no) (D1 - D8)
  • Push Buttons (8 no) or Switches
  • Terminal Connectors
  • Jumper
  • 5V DC supply

Step 1: Circuit Diagram of the ESP32 Bluetooth Project

This is the complete circuit diagram for this home automation project. I have explained the circuit in the tutorial video.

The circuit is very simple, I have used the GPIO pins D23, D22, D21, D19, D18, D5, D25 & D26 to control the 8 relays.

And the GPIO pins D13, D12, D14, D27, D33, D32, D15 & D4 are connected with Switches to control the 8 relays manually.

And the output pin of the IR Receiver is connected with GPIO D35.

I have used the INPUT_PULLUP function in Arduino IDE instead of using the pull-up resistors.

I have used a 5V 5A DC power supply.

Step 2: Testing the Circuit Before Designing the PCB

Before designing the PCB, I have made the complete circuit using ESP32, an 8-channel relay module, and manual switches.

As you can see, the relays can be controlled from the Bluetooth app, IR remote, and manual switches. You don't need any WiFi for this ESP32 project.

In the following steps, I have explained the complete projects in detail, also shared the source code and PCB Garber file.

Download the codes for this project.

Step 3: Control Relays Using Bluetooth App

After pairing the ESP32 with mobile Bluetooth, you can easily control the relays from the Bluetooth App.

I have made this Bluetooth app in MIT app inventor. The app is simple and easy to use.

You can download the app from the following link.

Step 4: ESP32 Control Relay With IR Remote

You can always control the relays from the IR remote. For this project, you can use any IR remote.

I will explain how to get the IR codes (HEX codes) from any remote in the following steps.

Step 5: Control Relays Manually With Switches

For this project, you can use both switches or push buttons.

If you want to use switch (latched), then upload the source code for switches.

And for the push button upload the source code for the manual button.

Both source codes are shared in this article.

Step 6: Design the PCB for ESP32 Smart Home System

To make the circuit compact and give a professional look, I have designed the PCB after testing all the features of the smart relay module.

You can download the PCB Gerber file of this home automation project from the following link:

Step 7: Order the PCB

After downloading the Garber file you can easily order the PCB

1. Visit and Sign in / Sign up

2. Click on the QUOTE NOW button.

3. Click on the "Add Gerber file" button. Then browse and select the Gerber file you have downloaded.

Step 8: Uploading the Gerber File and Set the Parameters

4. Set the required parameter like Quantity, PCB masking color, etc

5. After selecting all the Parameters for PCB click on SAVE TO CART button.

Step 9: Select Shipping Address and Payment Mode

6. Type the Shipping Address.

7. Select the Shipping Method suitable for you.

8. Submit the order and proceed with the payment. You can also track your order from

My PCBs took 2 days to get manufactured and arrived within a week using the DHL delivery option.

PCBs were well packed and the quality was really good at this affordable price.

Step 10: Solder All the Components on PCB

After that, I have soldered all the components as per the circuit diagram.
Then connect the ESP32 board and 1838 IR receiver with PCB.

Step 11: Get the IR Codes (HEX Code) From Remote

Now, to get the HEX codes from the remote, first, we have to connect the IR receiver output pin with GPIO D35.

And give the 5V across the VCC and GND. The IR receiver must have a metallic casing, otherwise, you may face issues.

Then follow the following steps to get the HEX codes

  1. Install the IRremote library in Arduino IDE
  2. Download the attached code, and upload it to ESP32.
  3. Open Serial Monitor with Baud rate 9600.
  4. Now, press the IR remote button.
  5. The respective HEX code will populate in the serial monitor.

Save all the HEX codes in a text file.

Step 12: Codes for the ESP32 (Bluetooth + IR) Home Automation

If you use switch (Latched) then refer to the code for Switch, and for momentary switch please use the code for the pushbutton.

Download and install the following libraries in Arduino IDE

AceButton Library:
IRremote Library:

Step 13: Program the ESP32 With Arduino IDE

Here, I have given the ESP32 Bluetooth name as "ESP32_BT". To change the name update the following line in void setup().

SerialBT.begin("ESP32_BT"); //Bluetooth device name

Then update the HEX code in the ir_remote function as shown in the tutorial video.

After that, select the DOIT ESP32 DEVKIT V1 board and proper PORT.

Then upload the code to ESP32 Board.

While uploading the code to ESP32, if you see the "Connecting....___" text, then press the BOOT button of the ESP32.

Step 14: Connect the Home Appliances

Connect the 8 home appliances as per the circuit diagram.

Please take proper safety precautions while working with high voltage.

Connect 5-volt DC supply with the PCB.

Step 15: Turn ON the Supply

Turn on the 110V/230V supply and 5V DC supply.

Step 16: Connect the Bluetooth App With ESP32

I have designed the Bluetooth Switch App in MIT App Inventor for this ESP32 Bluetooth project.

Please download and install the Bluetooth App (APK file attached), then you have to connect the Bluetooth App with ESP32.

  1. Turn ON mobile Bluetooth and Pair the ESP32.
  2. Open the Bluetooth Switch App and tap on "Tap to Connect".
  3. Select the "ESP32_BT" from the list.
  4. Now, you can control the relay from mobile with Bluetooth.

Download Bluetooth App for the ESP32 Bluetooth project

Step 17: Finally!! the ESP32 Home Automation System Is Ready

Now you can control your home appliances in a smart way.

I hope you have liked this ESP32 Bluetooth home automation project. I have shared all the required information for this project.

I will really appreciate it if you share your valuable feedback. Also if you have any query please write in the comment section.

Thank you & Happy Learning.

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