Circuit Documentation

Summary

This circuit is designed to control an LED and a buzzer using a PIR sensor, a pushbutton, and a Bluetooth module. The Arduino UNO microcontroller is the central unit that processes inputs from the PIR sensor and the pushbutton, and controls the LED and buzzer accordingly. The Bluetooth module allows for remote control of the LED.

Component List

1. 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

2. LED: Two Pin (red)

   • Description: A red LED with two pins.
   • Pins: cathode, anode

3. Buzzer

   • Description: A simple buzzer with two pins.
   • Pins: PIN, GND

4. Pushbutton

   • Description: A pushbutton with four pins.
   • Pins: Pin 3 (out), Pin 4 (out), Pin 1 (in), Pin 2 (in)

5. Bluetooth HC-06

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

6. Resistor

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

7. PIR Sensor

   • Description: A Passive Infrared (PIR) sensor for motion detection.
   • Pins: GND, VCC, Data

Wiring Details

Arduino UNO

• 5V is connected to:

  • Pushbutton Pin 4 (out)
  • PIR Sensor VCC
  • Bluetooth HC-06 VCC

• GND is connected to:

  • PIR Sensor GND
  • Bluetooth HC-06 GND
  • Resistor pin2
  • Buzzer GND

• D10 is connected to Buzzer PIN

• D9 is connected to LED anode

• D5 is connected to Bluetooth HC-06 RXD

• D4 is connected to Bluetooth HC-06 TXD

• D3 is connected to Pushbutton Pin 1 (in)

• D2 is connected to PIR Sensor Data

LED: Two Pin (red)

• anode is connected to Arduino UNO D9
• cathode is connected to Resistor pin1

Buzzer

• PIN is connected to Arduino UNO D10
• GND is connected to Arduino UNO GND

Pushbutton

• Pin 4 (out) is connected to Arduino UNO 5V
• Pin 1 (in) is connected to Arduino UNO D3

Bluetooth HC-06

• VCC is connected to Arduino UNO 5V
• GND is connected to Arduino UNO GND
• RXD is connected to Arduino UNO D5
• TXD is connected to Arduino UNO D4

Resistor

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

PIR Sensor

• VCC is connected to Arduino UNO 5V
• GND is connected to Arduino UNO GND
• Data is connected to Arduino UNO D2

Code Documentation

Arduino UNO Code

int pirPin = 2;          
int ledPin = 9;          
int buzzerPin = 10;      
int buttonPin = 3;       
int bluetoothPin = 4;    
unsigned long timer = 0; 
int delayTime = 300000;  
bool lightOn = false;   

void setup() {
  pinMode(pirPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);  
  Serial.begin(9600);                
}

void loop() {
  int pirState = digitalRead(pirPin);    
  int buttonState = digitalRead(buttonPin); 

  if (buttonState == LOW) {
    lightOn = !lightOn;
    digitalWrite(ledPin, lightOn ? HIGH : LOW);
    delay(500); 
  }

  if (Serial.available() > 0) {
    char command = Serial.read();
    if (command == '1') {
      digitalWrite(ledPin, HIGH); 
      lightOn = true;
    }
    if (command == '0') {
      digitalWrite(ledPin, LOW); 
      lightOn = false;
    }
  }

  if (pirState == HIGH && !lightOn) {
    digitalWrite(ledPin, HIGH);
    lightOn = true;
    timer = millis();
  }

  if (lightOn && millis() - timer >= delayTime) {
    for (int i = 0; i < 5; i++) {
      digitalWrite(buzzerPin, HIGH);
      delay(200);
      digitalWrite(buzzerPin, LOW);
      delay(200);
    }
    digitalWrite(ledPin, LOW);  
    lightOn = false;
  }
}

This code initializes the pins for the PIR sensor, LED, buzzer, pushbutton, and Bluetooth module. It reads the state of the PIR sensor and the pushbutton, and controls the LED and buzzer accordingly. The Bluetooth module allows for remote control of the LED.