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.

Tutorial Video on this ESP32 Bluetooth Home Automation:

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. 

 Circuit Diagram of the ESP32 Projects:

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.

Required Components:

  • ESP32 DEVKIT V1 board
  • 8-channel SPDT 5V Relay Module
  • TSOP1838 IR receiver
  • Manual Switches or Pushbuttons

Required Components for the PCB:

  • 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 (9 no) or Switches
  • Terminal Connectors
  • Jumper
  • 5V DC supply

Required Software:

  • 1. Arduino IDE
  • 2. Bluetooth App

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.

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.

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.

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.

Designing the PCB for ESP32 Projects:

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 on the breadboard.

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

Download the PCB Gerber File

Order the PCB from JLCPCB:

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.

Uploading the Gerber File and Set the Parameters...

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