Arduino UNO Controlled Smart Lighting System with HC-05 Bluetooth Module

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Circuit Documentation

Summary

The circuit in question is designed to control multiple AC bulbs using an Arduino UNO as the central processing unit, interfaced with an HC-05 Bluetooth module for wireless communication and a 4-channel 5V relay module to switch the AC bulbs on and off. The power supply for the circuit is a 220V AC source, which is also the operating voltage for the AC bulbs.

Component List

Arduino UNO

Microcontroller board based on the ATmega328P
It has 14 digital input/output pins, 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header, and a reset button.

HC-05 Bluetooth Module

Wireless communication module that can operate in either master or slave mode
It has 6 pins: EN (Enable), VCC, GND, TXD (Transmit), RXD (Receive), and STATE.

AC Bulb

Standard AC-powered light bulb
It has 2 pins: P (Phase) and N (Neutral).

Relay 4 Channel 5V

A 4-channel relay module with 5V operating voltage
It has multiple pins for ground (GND), input signals (IN1-IN4), VCC, common (COM1-COM4), normally open (NO1-NO4), and normally closed (NC1-NC4) contacts.

Power 220V

AC power supply
It has 2 pins: hot wire and neutral wire.

Wiring Details

Arduino UNO

5V to HC-05 VCC and Relay VCC
GND to HC-05 GND and Relay GND
Digital Pin D9 to Relay IN1
Digital Pin D8 to Relay IN2
Digital Pin D5 to Relay IN3
Digital Pin D4 to Relay IN4
Digital Pin D1 (TX) to HC-05 RXD
Digital Pin D0 (RX) to HC-05 TXD

HC-05 Bluetooth Module

VCC to Arduino 5V
GND to Arduino GND
TXD to Arduino D0 (RX)
RXD to Arduino D1 (TX)

AC Bulbs

N (Neutral) of each bulb to Relay COM1, COM2, COM3, and COM4 respectively
P (Phase) of all bulbs connected together and to Power 220V hot wire

Power 220V

Hot wire to P (Phase) of all AC Bulbs
Neutral wire to Relay NO1, NO2, NO3, and NO4

Documented Code

Arduino UNO Code (sketch.ino)

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

Note: The provided code is a template and does not contain any functional code to control the relay module or communicate with the HC-05 Bluetooth module. The user is expected to write the necessary code to implement the desired functionality.