Circuit Documentation

Summary

This circuit involves an Arduino Mega 2560 microcontroller interfacing with a DHT22 temperature and humidity sensor, an MQ-2 gas sensor, and a PIR motion sensor. The Arduino Mega 2560 reads data from these sensors and can be programmed to perform various tasks based on the sensor inputs.

Component List

Arduino Mega 2560

• Description: A microcontroller board based on the ATmega2560.
• Pins: IOREF, RESET, 3V3, 5V, GND, VIN, A0-A15, D0-D53, AREF, SDA, SCL

DHT22

• Description: A digital temperature and humidity sensor.
• Pins: +, Out, -

MQ-2

• Description: A gas sensor that can detect various gases including LPG, i-butane, methane, alcohol, hydrogen, and smoke.
• Pins: GND, VCC, ANALOG, Digital

PIR Sensor

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

Comments

• Description: Placeholder components for documentation purposes.
• Pins: None

Wiring Details

Arduino Mega 2560

• 5V: Connected to VDD of PIR sensor, + of DHT22, and VCC of MQ-2.
• GND: Connected to GND of PIR sensor, - of DHT22, and GND of MQ-2.
• D2 PWM: Connected to Out of DHT22.
• A0: Connected to ANALOG of MQ-2.
• D3 PWM: Connected to SIG of PIR sensor.

DHT22

• +: Connected to 5V of Arduino Mega 2560.
• Out: Connected to D2 PWM of Arduino Mega 2560.
• -: Connected to GND of Arduino Mega 2560.

MQ-2

• VCC: Connected to 5V of Arduino Mega 2560.
• GND: Connected to GND of Arduino Mega 2560.
• ANALOG: Connected to A0 of Arduino Mega 2560.
• Digital: Not connected.

PIR Sensor

• VDD: Connected to 5V of Arduino Mega 2560.
• SIG: Connected to D3 PWM of Arduino Mega 2560.
• GND: Connected to GND of Arduino Mega 2560.

Code Documentation

Arduino Mega 2560 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

This documentation provides a comprehensive overview of the circuit, including a summary, detailed component list, wiring details, and the code used for the Arduino Mega 2560 microcontroller.