Circuit Documentation

Summary

This circuit integrates an Arduino UNO, an ESP32, and various sensors and components to create a comprehensive system. The sensors include an MQ135 gas sensor, a BME/BMP280 environmental sensor, a GP2Y1010AU0F dust sensor, and an ultrasonic sensor. Additionally, a servo motor and a buzzer are included. The circuit is designed to monitor environmental conditions and control actuators based on sensor inputs.

Component List

1. 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

2. MQ135

   • Description: Gas sensor for detecting air quality.
   • Pins: VCC, GND, A0, D0

3. BME/BMP280

   • Description: Environmental sensor for measuring temperature, humidity, and pressure.
   • Pins: GND, SCL, SDA, VIN

4. GP2Y1010AU0F

   • Description: Dust sensor for measuring particulate matter in the air.
   • Pins: VCC, Vout, S-GND, LED, LED-GND, V-LED

5. Resistor

   • Description: A 200 Ohm resistor.
   • Pins: pin1, pin2
   • Properties: Resistance: 200 Ohms

6. Electrolytic Capacitor

   • Description: A capacitor with a capacitance of 1 µF.
   • Pins: -, +
   • Properties: Capacitance: 1 µF

7. ESP32 (30 pin)

   • Description: A microcontroller with 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

8. Ultrasonic Sensor

   • Description: Sensor for measuring distance using ultrasonic waves.
   • Pins: +VCC, Trigger, Echo, GND

9. Servo Motor 9G

   • Description: A small servo motor for precise control of angular position.
   • Pins: VCC 5V, PMW, GND

10. OV7725

    • Description: Camera module for capturing images.
    • Pins: 3V3, GND, SIOC, SIOD, VSYNC, HREF, PCLK, XCLK, D9, D8, D7, D6, D5, D4, D3, D2, RESET, D1, D0, PWDN

11. Buzzer

    • Description: An audio signaling device.
    • Pins: POSITIVE, NEGATIVE

Wiring Details

Arduino UNO

• 3.3V connected to ESP32 (30 pin) 3V3 and MQ135 VCC
• 5V connected to GP2Y1010AU0F VCC, Resistor pin1, and BME/BMP280 VIN
• GND connected to GP2Y1010AU0F S-GND, GP2Y1010AU0F LED-GND, MQ135 GND, BME/BMP280 GND, ESP32 (30 pin) GND, Ultrasonic Sensor GND, and Electrolytic Capacitor +
• D8 connected to GP2Y1010AU0F Vout
• D1 connected to ESP32 (30 pin) RX2
• D0 connected to ESP32 (30 pin) TX2

ESP32 (30 pin)

• 3V3 connected to Arduino UNO 3.3V and MQ135 VCC
• GND connected to Arduino UNO GND
• RX2 connected to Arduino UNO D1
• TX2 connected to Arduino UNO D0
• D34 connected to MQ135 A0
• D22 connected to BME/BMP280 SCL
• D21 connected to BME/BMP280 SDA
• D35 connected to GP2Y1010AU0F LED

MQ135

• VCC connected to ESP32 (30 pin) 3V3 and Arduino UNO 3.3V
• GND connected to Arduino UNO GND
• A0 connected to ESP32 (30 pin) D34

BME/BMP280

• VIN connected to Arduino UNO 5V
• GND connected to Arduino UNO GND
• SCL connected to ESP32 (30 pin) D22
• SDA connected to ESP32 (30 pin) D21

GP2Y1010AU0F

• VCC connected to Arduino UNO 5V
• Vout connected to Arduino UNO D8
• S-GND connected to Arduino UNO GND
• LED-GND connected to Arduino UNO GND
• LED connected to ESP32 (30 pin) D35
• V-LED connected to Electrolytic Capacitor -

Resistor

• pin1 connected to Arduino UNO 5V
• pin2 not connected

Electrolytic Capacitor

• + connected to Arduino UNO GND
• - connected to GP2Y1010AU0F V-LED

Ultrasonic Sensor

• GND connected to ESP32 (30 pin) GND

Servo Motor 9G

• VCC 5V not connected
• PMW not connected
• GND not connected

OV7725

• 3V3 not connected
• GND not connected

Buzzer

• POSITIVE not connected
• NEGATIVE not connected

Code Documentation

Arduino UNO Code

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

This code is a basic template for the Arduino UNO. The setup() function is used to initialize any settings or configurations, and the loop() function contains the main code that runs repeatedly.

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This documentation provides a comprehensive overview of the circuit, including a detailed component list, wiring details, and the code used in the Arduino UNO.