Circuit Documentation

Summary

This circuit is designed to monitor environmental conditions using various sensors and display the data on an LCD. It includes an ESP32 microcontroller, ultrasonic sensors, a rain sensor, a gas sensor, a buzzer, LEDs, pushbuttons, and servos. The system can detect rain, measure distances, detect gas, and control a servo motor based on sensor inputs. The data is displayed on a 16x2 I2C LCD.

Component List

1. ESP32 Wroom Dev Kit

   • Pins: 3V3, EN, VP, VN, GPIO 34, GPIO 35, GPIO 32, GPIO 33, GPIO 25, GPIO 26, GPIO 27, GPIO 14, GND, GPIO 13, SD2, SD3, CMD, V5, GPIO 23, GPIO 22, TXD, RXD, GPIO 21, GPIO 19, GPIO 18, GPIO 5, GPIO 17, GPIO 16, GPIO 4, GPIO 0, GPIO 2, GPIO 15, SD1, SD0, CLK
   • Description: Microcontroller used to control the circuit and process sensor data.

2. HC-SR04 Ultrasonic Sensor

   • Pins: VCC, TRIG, ECHO, GND
   • Description: Used to measure distance.

3. YL-83 Rain Sensor - Detection Board

   • Pins: POS, NEG
   • Description: Used to detect rain.

4. Rain/Snow Sensor - Board

   • Pins: 1, 2, A0 (Analog), D0 (Digital), GND, VCC (5V)
   • Description: Used to detect rain or snow.

5. MQ-2 Gas Sensor

   • Pins: GND, VCC, ANALOG, Digital
   • Description: Used to detect gas.

6. Pushbutton

   • Pins: Pin 2, Pin 1, Pin 3, Pin 4
   • Description: Used to control the servo motor.

7. Buzzer Module

   • Pins: GND, Vcc, I/O
   • Description: Used to alert when gas is detected.

8. LED: Two Pin (blue)

   • Pins: cathode, anode
   • Description: Used as an indicator.

9. Resistor (220 Ohms)

   • Pins: pin1, pin2
   • Description: Used to limit current for LEDs.

10. Resistor (10k Ohms)

    • Pins: pin1, pin2
    • Description: Used for pull-up/pull-down configurations.

11. Servo

    • Pins: GND, VCC, PWM
    • Description: Used to control mechanical movement.

12. 16x2 I2C LCD

    • Pins: GND, VCC, SDA, SCL
    • Description: Used to display sensor data.

13. MB102 Breadboard Power Supply Module 3.3V/5V

    • Pins: VCC, GND, 3.3V, 5V
    • Description: Provides power to the circuit.

Wiring Details

ESP32 Wroom Dev Kit

• GND connected to:

  • GND of HC-SR04 Ultrasonic Sensor
  • GND of Rain/Snow Sensor - Board
  • GND of MQ-2 Gas Sensor
  • GND of 16x2 I2C LCD
  • GND of MB102 Breadboard Power Supply Module
  • GND of Buzzer Module
  • GND of Servo

• V5 connected to:

  • VCC of HC-SR04 Ultrasonic Sensor
  • VCC of Rain/Snow Sensor - Board
  • VCC of MQ-2 Gas Sensor
  • VCC of 16x2 I2C LCD
  • VCC of Buzzer Module

• GPIO 14 connected to:

  • Pin 4 of Pushbutton
  • pin1 of Resistor (220 Ohms)

• GPIO 27 connected to:

  • Pin 4 of Pushbutton

• GPIO 15 connected to:

  • pin1 of Resistor (10k Ohms)

• GPIO 34 connected to:

  • ANALOG of MQ-2 Gas Sensor

• GPIO 35 connected to:

  • A0 (Analog) of Rain/Snow Sensor - Board

• GPIO 32 connected to:

  • TRIG of HC-SR04 Ultrasonic Sensor

• GPIO 33 connected to:

  • TRIG of HC-SR04 Ultrasonic Sensor

• GPIO 25 connected to:

  • ECHO of HC-SR04 Ultrasonic Sensor

• GPIO 26 connected to:

  • ECHO of HC-SR04 Ultrasonic Sensor

• GPIO 13 connected to:

  • PWM of Servo

• GPIO 22 connected to:

  • SCL of 16x2 I2C LCD

• GPIO 21 connected to:

  • SDA of 16x2 I2C LCD

• GPIO 2 connected to:

  • I/O of Buzzer Module

HC-SR04 Ultrasonic Sensor

• VCC connected to:

  • V5 of ESP32 Wroom Dev Kit

• GND connected to:

  • GND of ESP32 Wroom Dev Kit

• TRIG connected to:

  • GPIO 32 of ESP32 Wroom Dev Kit
  • GPIO 33 of ESP32 Wroom Dev Kit

• ECHO connected to:

  • GPIO 25 of ESP32 Wroom Dev Kit
  • GPIO 26 of ESP32 Wroom Dev Kit

YL-83 Rain Sensor - Detection Board

• POS connected to:

  • 2 of Rain/Snow Sensor - Board

• NEG connected to:

  • 1 of Rain/Snow Sensor - Board

Rain/Snow Sensor - Board

• VCC (5V) connected to:

  • V5 of ESP32 Wroom Dev Kit

• GND connected to:

  • GND of ESP32 Wroom Dev Kit

• A0 (Analog) connected to:

  • GPIO 35 of ESP32 Wroom Dev Kit

• 2 connected to:

  • POS of YL-83 Rain Sensor - Detection Board

• 1 connected to:

  • NEG of YL-83 Rain Sensor - Detection Board

MQ-2 Gas Sensor

• VCC connected to:

  • V5 of ESP32 Wroom Dev Kit

• GND connected to:

  • GND of ESP32 Wroom Dev Kit

• ANALOG connected to:

  • GPIO 34 of ESP32 Wroom Dev Kit

Pushbutton

• Pin 4 connected to:

  • GPIO 14 of ESP32 Wroom Dev Kit
  • GPIO 27 of ESP32 Wroom Dev Kit

• Pin 1 connected to:

  • Pin 1 of another Pushbutton

• Pin 3 connected to:

  • pin1 of Resistor (220 Ohms)

Buzzer Module

• Vcc connected to:

  • V5 of ESP32 Wroom Dev Kit

• GND connected to:

  • GND of ESP32 Wroom Dev Kit

• I/O connected to:

  • GPIO 2 of ESP32 Wroom Dev Kit

LED: Two Pin (blue)

• cathode connected to:

  • pin2 of Resistor (220 Ohms)

• anode connected to:

  • pin2 of Resistor (220 Ohms)

Resistor (220 Ohms)

• pin1 connected to:

  • GPIO 14 of ESP32 Wroom Dev Kit
  • GPIO 15 of ESP32 Wroom Dev Kit

• pin2 connected to:

  • cathode of LED: Two Pin (blue)
  • anode of LED: Two Pin (blue)

Resistor (10k Ohms)

• pin1 connected to:
  • GPIO 15 of ESP32 Wroom Dev Kit

Servo

• GND connected to:

  • GND of ESP32 Wroom Dev Kit

• VCC connected to:

  • VCC of MB102 Breadboard Power Supply Module

• PWM connected to:

  • GPIO 13 of ESP32 Wroom Dev Kit

16x2 I2C LCD

• GND connected to:

  • GND of ESP32 Wroom Dev Kit

• VCC connected to:

  • V5 of ESP32 Wroom Dev Kit

• SDA connected to:

  • GPIO 21 of ESP32 Wroom Dev Kit

• SCL connected to:

  • GPIO 22 of ESP32 Wroom Dev Kit

MB102 Breadboard Power Supply Module 3.3V/5V

• VCC connected to:

  • VCC of Servo

• GND connected to:

  • GND of