Circuit Documentation

Summary

This circuit involves an Arduino UNO microcontroller interfacing with a 16x2 I2C LCD, an MQ-2 gas sensor, a red LED, a buzzer, and a resistor. The Arduino UNO serves as the central control unit, reading data from the MQ-2 sensor and displaying information on the LCD. The LED and buzzer provide visual and auditory alerts, respectively.

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

16x2 I2C LCD

• Description: A 16x2 character LCD display with I2C interface.
• Pins: GND, VCC, SDA, SCL

MQ-2

• Description: A gas sensor for detecting LPG, i-butane, propane, methane, alcohol, hydrogen, and smoke.
• Pins: GND, VCC, ANALOG, Digital

LED: Two Pin (red)

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

Buzzer

• Description: A simple buzzer for sound output.
• Pins: PIN, GND

Resistor

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

Wiring Details

Arduino UNO

• GND: Connected to GND of MQ-2, 16x2 I2C LCD, and Buzzer.
• 5V: Connected to VCC of MQ-2 and 16x2 I2C LCD.
• A0: Connected to ANALOG of MQ-2.
• D9: Connected to anode of LED.
• D8: Connected to PIN of Buzzer.
• SCL: Connected to SCL of 16x2 I2C LCD.
• SDA: Connected to SDA of 16x2 I2C LCD.

16x2 I2C LCD

• GND: Connected to GND of Arduino UNO.
• VCC: Connected to 5V of Arduino UNO.
• SDA: Connected to SDA of Arduino UNO.
• SCL: Connected to SCL of Arduino UNO.

MQ-2

• GND: Connected to GND of Arduino UNO.
• VCC: Connected to 5V of Arduino UNO.
• ANALOG: Connected to A0 of Arduino UNO.

LED: Two Pin (red)

• Anode: Connected to D9 of Arduino UNO.
• Cathode: Connected to pin2 of Resistor.

Buzzer

• GND: Connected to GND of Arduino UNO.
• PIN: Connected to D8 of Arduino UNO.

Resistor

• Pin1: Connected to GND of Arduino UNO.
• Pin2: Connected to cathode of LED.

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)

This documentation provides a comprehensive overview of the circuit, including a summary, detailed component list, wiring details, and the code used in the Arduino UNO.