Circuit Documentation

Summary

This circuit involves an Arduino UNO, an ESP8266 NodeMCU, various sensors, LEDs, a buzzer, and a 16x2 I2C LCD. The Arduino UNO serves as the main microcontroller, interfacing with the LEDs, buzzer, and LCD. The ESP8266 NodeMCU is used for Wi-Fi connectivity and interfaces with the GPS module and MQ2 gas sensor. The circuit is powered through the Arduino UNO and ESP8266 NodeMCU.

Component List

1. Arduino UNO

   • Description: Main microcontroller
   • 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: Red LED
   • Pins: cathode, anode

3. LED: Two Pin (green)

   • Description: Green LED
   • Pins: cathode, anode

4. Resistor (10 Ohms)

   • Description: Resistor with 10 Ohms resistance
   • Pins: pin1, pin2

5. Resistor (20 Ohms)

   • Description: Resistor with 20 Ohms resistance
   • Pins: pin1, pin2

6. ESP8266 NodeMCU

   • Description: Wi-Fi microcontroller
   • Pins: D0, D1, D2, D3, D4, 3V3, GND, D5, D6, D7, D8, RX, TX, A0, RSV, SD3, SD2, SD1, CMD, SD0, CLK, EN, RST, VIN

7. Buzzer

   • Description: Buzzer for sound output
   • Pins: PIN, GND

8. GPS NEO 6M

   • Description: GPS module
   • Pins: VCC, RX, TX, GND

9. 16x2 I2C LCD

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

10. MQ2

    • Description: Gas sensor
    • Pins: VCC, GND, AOUT, DOUT

Wiring Details

Arduino UNO

• GND: Connected to the cathode of the green LED, cathode of the red LED, GND of MQ2, GND of 16x2 I2C LCD, and GND of the buzzer.
• D6: Connected to the anode of the green LED.
• D7: Connected to the anode of the red LED.
• 5V: Connected to pin1 of the 20 Ohms resistor, VCC of MQ2, and VCC of 16x2 I2C LCD.
• A0: Connected to pin2 of the 10 Ohms resistor and AOUT of MQ2.
• A4: Connected to SDA of 16x2 I2C LCD.
• A5: Connected to SCL of 16x2 I2C LCD.
• D3: Connected to PIN of the buzzer.

LED: Two Pin (red)

• cathode: Connected to GND of Arduino UNO.
• anode: Connected to D7 of Arduino UNO.

LED: Two Pin (green)

• cathode: Connected to GND of Arduino UNO.
• anode: Connected to D6 of Arduino UNO.

Resistor (10 Ohms)

• pin1: Connected to pin2 of the 20 Ohms resistor.
• pin2: Connected to A0 of Arduino UNO and AOUT of MQ2.

Resistor (20 Ohms)

• pin1: Connected to 5V of Arduino UNO, VCC of MQ2, and VCC of 16x2 I2C LCD.
• pin2: Connected to pin1 of the 10 Ohms resistor and A0 of ESP8266 NodeMCU.

ESP8266 NodeMCU

• GND: Connected to pin1 of the 20 Ohms resistor and GND of GPS NEO 6M.
• A0: Connected to pin2 of the 10 Ohms resistor.
• D5: Connected to TX of GPS NEO 6M.
• D6: Connected to RX of GPS NEO 6M.
• 3V3: Connected to VCC of GPS NEO 6M.

Buzzer

• GND: Connected to GND of Arduino UNO.
• PIN: Connected to D3 of Arduino UNO.

GPS NEO 6M

• TX: Connected to D5 of ESP8266 NodeMCU.
• RX: Connected to D6 of ESP8266 NodeMCU.
• GND: Connected to GND of ESP8266 NodeMCU.
• VCC: Connected to 3V3 of ESP8266 NodeMCU.

16x2 I2C LCD

• GND: Connected to GND of Arduino UNO.
• VCC: Connected to 5V of Arduino UNO.
• SDA: Connected to A4 of Arduino UNO.
• SCL: Connected to A5 of Arduino UNO.

MQ2

• GND: Connected to GND of Arduino UNO.
• VCC: Connected to pin1 of the 20 Ohms resistor.
• AOUT: Connected to pin2 of the 10 Ohms resistor and A0 of Arduino UNO.

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:

}

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 microcontrollers.