Circuit Documentation

Summary

This circuit is designed to interface an ESP32 microcontroller with various sensors and output devices. The ESP32 reads data from a PIR sensor, a flame sensor, and an MQ-2 gas sensor. It also controls a buzzer and displays information on a 16x2 I2C LCD. The circuit is powered by the 3.3V and Vin pins of the ESP32.

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. 16x2 I2C LCD

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

3. KY-026 Flame Sensor

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

4. MQ-2

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

5. PIR sensor

   • Description: A passive infrared sensor for motion detection.
   • Pins: VDD, SIG, GND

6. Buzzer

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

Wiring Details

ESP32 (30 pin)

• 3V3: Connected to VCC of MQ-2, VDD of PIR sensor, and VCC of KY-026 Flame Sensor.
• GND: Connected to GND of MQ-2, GND of PIR sensor, GND of KY-026 Flame Sensor, GND of 16x2 I2C LCD, and GND of Buzzer.
• Vin: Connected to VCC of 16x2 I2C LCD.
• D32: Connected to SIG of PIR sensor.
• D34: Connected to DO of KY-026 Flame Sensor.
• D35: Connected to Digital of MQ-2.
• D23: Connected to PIN of Buzzer.
• D22: Connected to SCL of 16x2 I2C LCD.
• D21: Connected to SDA of 16x2 I2C LCD.

16x2 I2C LCD

• GND: Connected to GND of ESP32.
• VCC: Connected to Vin of ESP32.
• SDA: Connected to D21 of ESP32.
• SCL: Connected to D22 of ESP32.

KY-026 Flame Sensor

• GND: Connected to GND of ESP32.
• VCC: Connected to 3V3 of ESP32.
• DO: Connected to D34 of ESP32.

MQ-2

• GND: Connected to GND of ESP32.
• VCC: Connected to 3V3 of ESP32.
• Digital: Connected to D35 of ESP32.

PIR sensor

• GND: Connected to GND of ESP32.
• VDD: Connected to 3V3 of ESP32.
• SIG: Connected to D32 of ESP32.

Buzzer

• GND: Connected to GND of ESP32.
• PIN: Connected to D23 of ESP32.

Code

No code provided for this circuit.