Circuit Documentation

Summary

The circuit in question is designed to interface an Arduino UNO with various peripherals including an HC-05 Bluetooth Module, a buzzer, a 16x2 LCD, a two-channel 5V relay, and two bulbs. The Arduino UNO serves as the central microcontroller unit, managing input and output signals to control the connected devices. The HC-05 Bluetooth Module allows for wireless communication, while the relay module controls power to the bulbs. The LCD displays information, and the buzzer provides audible alerts. A potentiometer is included to adjust the contrast of the LCD. The circuit is powered by a 5V supply from the Arduino and a separate 220V power source for the relay and bulbs.

Component List

Arduino UNO

• Microcontroller board based on the ATmega328P
• Digital I/O Pins: 14 (of which 6 provide PWM output)
• Analog Input Pins: 6
• Operating Voltage: 5V

HC-05 Bluetooth Module

• Wireless communication module for Bluetooth connectivity
• Operating Voltage: 3.3V to 6V

Buzzer

• An audible signaling device
• Operating Voltage: Typically 5V

16X2 LCD

• Alphanumeric Liquid Crystal Display
• 16 characters wide, 2 rows
• Operating Voltage: 5V

Two Channel Relay 5v

• Relay module with two channels
• Operating Voltage: 5V

Bulb

• Electric light source
• Operating Voltage: 220V

Potentiometer

• Three-terminal resistor with an adjustable voltage divider
• Operating Voltage: Typically 5V

Power 220v

• Main power supply
• Voltage: 220V AC

Wiring Details

Arduino UNO

• 5V to VCC of LCD, Potentiometer, Relay, and HC-05 Bluetooth Module
• GND to GND of Potentiometer, Relay, LCD, Buzzer, and HC-05 Bluetooth Module
• D13 to PIN of Buzzer
• D12 to D6 of LCD
• D11 to D5 of LCD
• D10 to D4 of LCD
• D9 to E of LCD
• D8 to RS of LCD
• D5 to IN2 of Relay
• D4 to IN1 of Relay
• D3 to TXD of HC-05 Bluetooth Module
• D2 to RXD of HC-05 Bluetooth Module

HC-05 Bluetooth Module

• VCC to 5V of Arduino UNO
• GND to GND of Arduino UNO
• TXD to D3 of Arduino UNO
• RXD to D2 of Arduino UNO

Buzzer

• PIN to D13 of Arduino UNO
• GND to GND of Arduino UNO

16X2 LCD

• VDD to 5V of Arduino UNO
• VSS, RW to GND of Arduino UNO
• V0 to Output of Potentiometer
• RS to D8 of Arduino UNO
• E to D9 of Arduino UNO
• D4 to D10 of Arduino UNO
• D5 to D11 of Arduino UNO
• D6 to D12 of Arduino UNO
• D7 to D13 of Arduino UNO

Two Channel Relay 5v

• VCC to 5V of Arduino UNO
• GND to GND of Arduino UNO
• IN1 to D4 of Arduino UNO
• IN2 to D5 of Arduino UNO
• NC1 to power of Bulb (instance a5f20df5-9651-4d78-b4fa-ebfcca759a8c)
• NC2 to power of Bulb (instance 3cff27f7-e5f6-4d75-8721-f6e7ae45d33a)
• C1, C2 to hot wire of Power 220v

Bulb (instance a5f20df5-9651-4d78-b4fa-ebfcca759a8c)

• power to NC1 of Relay
• GND to neutral wire of Power 220v

Bulb (instance 3cff27f7-e5f6-4d75-8721-f6e7ae45d33a)

• power to NC2 of Relay
• GND to neutral wire of Power 220v

Potentiometer

• VCC to 5V of Arduino UNO
• Output to V0 of LCD
• GND to GND of Arduino UNO

Power 220v

• hot wire to C1, C2 of Relay
• neutral wire to GND of Bulbs

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 for the Arduino UNO is a template with empty setup and loop functions. Actual functionality needs to be implemented based on the desired behavior of the circuit.