Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes an ESP32 microcontroller, a buzzer, a 16x2 I2C LCD, a KY-026 Flame Sensor, and an MQ-2 gas sensor. The circuit is designed to detect flame and gas presence and provide visual and auditory alerts.

Component List

1. ESP32 (30 pin)

   • Description: A powerful microcontroller with built-in Wi-Fi and Bluetooth capabilities.
   • 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

2. Buzzer

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

3. 16x2 I2C LCD

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

4. KY-026 Flame Sensor

   • Description: A sensor module for detecting flame.
   • Pins: AO, GND, VCC, DO

5. MQ-2

   • Description: A gas sensor module for detecting various gases.
   • Pins: GND, VCC, ANALOG, Digital

Wiring Details

ESP32 (30 pin)

• GND is connected to:

  • KY-026 Flame Sensor (GND)
  • MQ-2 (GND)
  • Buzzer (GND)
  • 16x2 I2C LCD (GND)

• 3V3 is connected to:

  • KY-026 Flame Sensor (VCC)
  • MQ-2 (VCC)

• D34 is connected to:

  • KY-026 Flame Sensor (DO)

• D23 is connected to:

  • Buzzer (PIN)

• D35 is connected to:

  • MQ-2 (Digital)

• Vin is connected to:

  • 16x2 I2C LCD (VCC)

• D22 is connected to:

  • 16x2 I2C LCD (SCL)

• D21 is connected to:

  • 16x2 I2C LCD (SDA)

Buzzer

• PIN is connected to:

  • ESP32 (D23)

• GND is connected to:

  • ESP32 (GND)
  • 16x2 I2C LCD (GND)

16x2 I2C LCD

• GND is connected to:

  • ESP32 (GND)
  • Buzzer (GND)

• VCC is connected to:

  • ESP32 (Vin)

• SDA is connected to:

  • ESP32 (D21)

• SCL is connected to:

  • ESP32 (D22)

KY-026 Flame Sensor

• GND is connected to:

  • ESP32 (GND)

• VCC is connected to:

  • ESP32 (3V3)

• DO is connected to:

  • ESP32 (D34)

MQ-2

• GND is connected to:

  • ESP32 (GND)

• VCC is connected to:

  • ESP32 (3V3)

• Digital is connected to:

  • ESP32 (D35)

Code

No code is provided for this circuit.

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This document provides a comprehensive overview of the circuit, including a summary, component list, wiring details, and code documentation. The wiring details section ensures that each component's connections are clearly outlined, facilitating easy assembly and troubleshooting.