Circuit Documentation

Summary

This circuit involves an Arduino UNO microcontroller, a photocell (LDR), an HC-05 Bluetooth module, a 5V relay, resistors, an LED, and a bulb connected to a 240V power source. The circuit is designed to control the bulb using the relay, with inputs from the photocell and Bluetooth module. The LED is used as an indicator.

Component List

Arduino UNO

• Description: A microcontroller board based on the ATmega328P.
• Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0, A1, A2, A3, A4, A5, SCL, SDA, AREF, D13, D12, D11, D10, D9, D8, D7, D6, D5, D4, D3, D2, D1, D0

Photocell (LDR)

• Description: A light-dependent resistor used to detect light levels.
• Pins: pin 0, pin 1

HC-05 Bluetooth Module

• Description: A Bluetooth module used for wireless communication.
• Pins: Key, VCC, TXD, RXD, State, GND

5V Relay

• Description: An electromechanical switch used to control high voltage devices.
• Pins: Normally Open, Common terminal, Normally Closed, In, GND, VCC

Resistor (10k Ohms)

• Description: A resistor with a resistance of 10k Ohms.
• Pins: pin1, pin2

LED: Two Pin (orange)

• Description: An orange LED used as an indicator.
• Pins: cathode, anode

Resistor (220 Ohms)

• Description: A resistor with a resistance of 220 Ohms.
• Pins: pin1, pin2

Bulb

• Description: A standard bulb.
• Pins: +, -

240V Power Source

• Description: A power source providing 240V AC.
• Pins: Live, Neutral

Wiring Details

Arduino UNO

• 5V connected to Photocell (LDR) pin 0, 5V Relay VCC, HC-05 Bluetooth Module VCC
• GND connected to 5V Relay GND, Resistor (10k Ohms) pin2, HC-05 Bluetooth Module GND, Resistor (220 Ohms) pin2
• A5 connected to Photocell (LDR) pin 0
• D13 connected to LED anode
• D7 connected to 5V Relay In
• D1 connected to HC-05 Bluetooth Module RXD
• D0 connected to HC-05 Bluetooth Module TXD

Photocell (LDR)

• pin 0 connected to Arduino UNO 5V, Arduino UNO A5
• pin 1 not connected

HC-05 Bluetooth Module

• VCC connected to Arduino UNO 5V
• GND connected to Arduino UNO GND
• TXD connected to Arduino UNO D0
• RXD connected to Arduino UNO D1

5V Relay

• VCC connected to Arduino UNO 5V
• GND connected to Arduino UNO GND
• In connected to Arduino UNO D7
• Normally Open connected to 240V Power Source Live
• Common terminal connected to Bulb +
• Normally Closed connected to 240V Power Source Neutral, Bulb -

Resistor (10k Ohms)

• pin1 not connected
• pin2 connected to Arduino UNO GND

LED: Two Pin (orange)

• anode connected to Arduino UNO D13
• cathode connected to Resistor (220 Ohms) pin1

Resistor (220 Ohms)

• pin1 connected to LED cathode
• pin2 connected to Arduino UNO GND

Bulb

• + connected to 5V Relay Common terminal
• - connected to 240V Power Source Neutral, 5V Relay Normally Closed

240V Power Source

• Live connected to 5V Relay Normally Open
• Neutral connected to Bulb -, 5V Relay Normally Closed

Code Documentation

Arduino UNO Code

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

}

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

}

This code is a basic template for the Arduino UNO. The setup() function is used to initialize any settings or configurations, and the loop() function contains the main code that runs repeatedly. Currently, both functions are empty and need to be filled with the appropriate logic for the circuit's operation.