Circuit Documentation

Summary

This circuit is designed to interface an Arduino UNO with a PIR sensor, a 5V relay, a piezo buzzer, and a 9V battery. The PIR sensor detects motion and sends a signal to the Arduino, which then activates the relay. The relay, in turn, controls the piezo buzzer, which is powered by the 9V battery.

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. PIR sensor

   • Description: A passive infrared sensor used to detect motion.
   • Pins: VDD, SIG, GND

3. 5V relay

   • Description: An electromechanical relay that operates at 5V.
   • Pins: Normally Open, Common terminal, Normally Closed, In, GND, VCC

4. Piezo Buzzer

   • Description: An electronic device that produces a sound when a voltage is applied.
   • Pins: pin 1, pin 2

5. 9V battery

   • Description: A battery providing 9V DC power.
   • Pins: +, -

Wiring Details

Arduino UNO

• 5V is connected to:

  • VCC of the 5V relay
  • VDD of the PIR sensor

• GND is connected to:

  • GND of the PIR sensor
  • GND of the 5V relay

• D8 is connected to:

  • In of the 5V relay

• D7 is connected to:

  • SIG of the PIR sensor

PIR sensor

• VDD is connected to:

  • 5V of the Arduino UNO

• SIG is connected to:

  • D7 of the Arduino UNO

• GND is connected to:

  • GND of the Arduino UNO

5V relay

• VCC is connected to:

  • 5V of the Arduino UNO

• GND is connected to:

  • GND of the Arduino UNO

• In is connected to:

  • D8 of the Arduino UNO

• Normally Open is connected to:

  • - of the 9V battery

• Common terminal is connected to:

  • pin 2 of the Piezo Buzzer

Piezo Buzzer

• pin 1 is connected to:

  • + of the 9V battery

• pin 2 is connected to:

  • Common terminal of the 5V relay

9V battery

• + is connected to:

  • pin 1 of the Piezo Buzzer

• - is connected to:

  • Normally Open of the 5V relay

Documented Code

sketch.ino

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

}

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

}

documentation.txt