Circuit Documentation

Summary

This document provides a detailed overview of a circuit that integrates various components including an Arduino UNO, an ESP32, sensors, a relay, a servo, a water pump, and a buzzer. The circuit is designed to perform multiple functions such as sensing gas and flame, controlling a water pump, and displaying information on an LCD screen. The Arduino UNO serves as the primary microcontroller, with additional functionality provided by the ESP32.

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

ESP32 (30 pin)

• Description: A low-cost, low-power system on a chip microcontroller with integrated Wi-Fi and dual-mode Bluetooth.
• Pins: EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, GND, Vin, D23, D22, TX0, RX0, D21, D19, D18, D5, TX2, RX2, D4, D2, D15, 3V3

MQ-2

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

KY-026 Flame Sensor

• Description: A flame sensor module that can detect fire or other light sources in the wavelength range of 760nm to 1100nm.
• Pins: A0, GND, VCC, D0

Servo

• Description: A small motor with a feedback mechanism for precise control of angular position.
• Pins: gnd, vcc, pulse

1-Channel Relay (5V 10A)

• Description: A relay module that allows a microcontroller to control high voltage devices.
• Pins: NC, signal, C, power, NO, ground

Water Pump

• Description: A small water pump for liquid transfer.
• Pins: positive, negative

Buzzer

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

Wiring Details

Arduino UNO

• 5V connected to:

  • 16x2 I2C LCD (VCC)
  • 1-Channel Relay (power)
  • Servo (vcc)
  • MQ-2 (VCC)
  • KY-026 Flame Sensor (VCC)

• GND connected to:

  • 16x2 I2C LCD (GND)
  • 1-Channel Relay (ground)
  • MQ-2 (GND)
  • Servo (gnd)
  • KY-026 Flame Sensor (GND)
  • Buzzer (GND)
  • ESP32 (GND)

• A4 connected to:

  • 16x2 I2C LCD (SDA)

• A5 connected to:

  • 16x2 I2C LCD (SCL)

• D12 connected to:

  • KY-026 Flame Sensor (D0)

• D9 connected to:

  • Servo (pulse)

• D7 connected to:

  • Buzzer (PIN)

• D5 connected to:

  • MQ-2 (Digital)

• D3 connected to:

  • 1-Channel Relay (signal)

• D1 connected to:

  • ESP32 (RX0)

1-Channel Relay (5V 10A)

• NC connected to:

  • Water Pump (negative)

• NO connected to:

  • Water Pump (positive)

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 document provides a comprehensive overview of the circuit, including a summary, detailed component descriptions, wiring details, and documented code.