Circuit Documentation

Summary

This circuit involves an Arduino UNO microcontroller interfacing with various sensors and output devices. The sensors include a PIR sensor, an MQ-2 gas sensor, and an SW-420 vibration sensor. The output devices include a buzzer and two red LEDs. The circuit is designed to detect motion, gas presence, and vibrations, and respond accordingly by activating the buzzer and LEDs.

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. MQ-2

   • Description: A gas sensor used to detect the presence of gases like LPG, i-butane, propane, methane, alcohol, Hydrogen, and smoke.
   • Pins: GND, VCC, ANALOG, Digital

4. SW-420 Vibration Sensor

   • Description: A vibration sensor module used to detect vibrations.
   • Pins: vcc, Ground, Digital output

5. Buzzer

   • Description: An audio signaling device.
   • Pins: PIN, GND

6. LED: Two Pin (red)

   • Description: A red light-emitting diode.
   • Pins: cathode, anode

7. Resistor (200 Ohms)

   • Description: A resistor with a resistance of 200 Ohms.
   • Pins: pin1, pin2

Wiring Details

Arduino UNO

• GND is connected to:

  • GND of PIR sensor
  • GND of buzzer
  • GND of MQ-2
  • Ground of SW-420 Vibration Sensor
  • pin1 of Resistor (200 Ohms)
  • pin1 of another Resistor (200 Ohms)

• 5V is connected to:

  • VDD of PIR sensor
  • VCC of MQ-2
  • vcc of SW-420 Vibration Sensor

• D4 is connected to:

  • cathode of LED (red)

• D5 is connected to:

  • cathode of another LED (red)

• A0 is connected to:

  • ANALOG of MQ-2

• D6 is connected to:

  • SIG of PIR sensor

• D3 is connected to:

  • PIN of buzzer

• D2 is connected to:

  • Digital output of SW-420 Vibration Sensor

PIR sensor

• GND is connected to:

  • GND of Arduino UNO

• VDD is connected to:

  • 5V of Arduino UNO

• SIG is connected to:

  • D6 of Arduino UNO

MQ-2

• GND is connected to:

  • GND of Arduino UNO

• VCC is connected to:

  • 5V of Arduino UNO

• ANALOG is connected to:

  • A0 of Arduino UNO

SW-420 Vibration Sensor

• Ground is connected to:

  • GND of Arduino UNO

• vcc is connected to:

  • 5V of Arduino UNO

• Digital output is connected to:

  • D2 of Arduino UNO

Buzzer

• GND is connected to:

  • GND of Arduino UNO

• PIN is connected to:

  • D3 of Arduino UNO

LED: Two Pin (red)

• cathode is connected to:

  • D4 of Arduino UNO

• anode is connected to:

  • pin2 of Resistor (200 Ohms)

Another LED: Two Pin (red)

• cathode is connected to:

  • D5 of Arduino UNO

• anode is connected to:

  • pin2 of another Resistor (200 Ohms)

Resistor (200 Ohms)

• pin1 is connected to:

  • GND of Arduino UNO

• pin2 is connected to:

  • anode of LED (red)

Another Resistor (200 Ohms)

• pin1 is connected to:

  • GND of Arduino UNO

• pin2 is connected to:

  • anode of another LED (red)

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:

}

Additional Documentation (documentation.txt)