Arduino Bluetooth Relay Switch

  • Rajkumar Sharma
  • 42 Views
  • easy
  • Tested
  • SKU: EL153725
  • Quote Now

This Bluetooth Relay Switch enables users to control lights, fans, or other devices using a Bluetooth app on an Android device. The device can be controlled using a simple app. The project consists of an Arduino-compatible microcontroller (ATMEGA328), a 5V relay, a relay driver BJT, and an optocoupler, which provides isolation between the relay and microcontroller, ensuring noise immunity and preventing high voltage entering the DC circuit. The HC-05 Bluetooth module provides wireless connectivity between the Android app and the Bluetooth board. Screw terminals are provided to connect the load to the relay contacts, and a header connector is available to power the board with 5V. A power LED indicates the presence of power, and a relay LED indicates relay operations. The relay contacts can handle loads up to 7A/250V AC and 10A/24V DC. An 8-pin header connector is provided for Arduino programming and Bootloader load.

Bootloader and Arduino Programming

To test the board, download the Arduino code and upload it to the ATMEGA328 microcontroller. Before uploading the code, ensure that the Bootloader is loaded on the new ATMEGA328.

Refer to the connections diagram for Arduino programming and bootloader instructions.

https://docs.arduino.cc/built-in-examples/arduino-isp/ArduinoToBreadboard/

Bluetooth Android App Download

https://play.google.com/store/apps/details?id=com.giristudio.hc05.bluetooth.arduino.control&hl=en

Features

  • Power Supply 5V DC @ 100mA
  • Wireless Bluetooth Connectivity
  • On Board Power LED
  • On Board Relay LED
  • 4 x 4 mm Mounting Holes
  • PCB Dimensions 74.61 x 28.89 mm

Connections

  • CN1: Pin 1 VCC 5V DC, Pin 2 = GND
  • CN2: Relay Contacts, Pin 1 = Relay Normally Closed (NC) , Pin 2 = GND, Pin 3 = Normally Open (NO)
  • D1: Relay LED
  • D3: Power LED
  • CN5: Bluetooth HC-05 Module

Schematic

Parts List

NOQNTY.REFDESC.MANUFACTURERSUPPLIERSUPPLIER PART NO
11CN12 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5315-ND
21CN23 PIN SCREW TERMINAL PITCH 5.08MMPHOENIXDIGIKEY277-1248-ND
31CN38 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5321-ND
41CN4DO NOT INSTALL
51CN5BLUETOOTH MODULE HC-05ALIEXPRESS/AMAZON
62C1,C310uF/16V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
72C2,C40.1uF/25V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
82C5,R8DNP
92C6,C722PF/50V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
102D1,D3LED RED/GREEN SMD SIZE 0805OSRAMDIGIKEY475-1278-1-ND
111D21N4007 SMDDIODE INCDIGIKEYS1MBDITR-ND
121Q1BC847AL SOT23-3NEXPERIADIGIKEY1727-2921-1-ND
131RL15V RELAYTE CONNECTIVITYDIGIKEYPB2032-ND
142R1,R61K 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
151R210K 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
162R3,R54.7K 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
171R4470E 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
181R71M 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
191U1ATMEGA328TQPF-32MICROCHIPDIGIKEYATMEGA328P-AU-ND
201U2PC817SHARPDIGIKEYPC817X2NSZ9F-ND
211X116MhzECS IONCDIGIKEYX1103-ND

Connections

Gerber View

Photos

Video

HC-05 Bluetooth Datasheet

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