Circuit Documentation

Summary

The circuit in question appears to be designed for environmental sensing and control, featuring a microcontroller, air quality sensor, temperature and pressure sensor, a visual and audible alert system, and a power control system for a 12V fan. The ESP32 microcontroller serves as the central processing unit, interfacing with the MQ-135 air quality sensor and the BME/BMP280 temperature and pressure sensor. The LED and buzzer provide visual and audible alerts, respectively. The SSR-10A solid-state relay controls the power to the 12V fan, which is powered by a 12V power supply. A resistor is used in series with the LED to limit current.

Component List

Buzzer

• Description: An audible alert device.
• Pins: PIN, GND

LED: Two Pin (red)

• Description: A visual alert device emitting red light.
• Pins: cathode, anode

MQ-135 SENSOR AIR QUALITY

• Description: A sensor for detecting various gases in the air.
• Pins: VCC, GND, A0, D0

BME/BMP280

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

Resistor

• Description: A passive two-terminal electrical component that implements electrical resistance as a circuit element.
• Pins: pin1, pin2
• Properties: Resistance: 200 Ohms

ESP32-WROOM-32UE

• Description: A powerful microcontroller with Wi-Fi and Bluetooth capabilities.
• Pins: 3v3, EN, VP, VN, 34, 35, 32, 33, 25, 26, 27, 14, 12, GND, 13, D2, D3, 5V, 23, 22, TX, RX, 21, 19, 18, 5, 17, 16, 4, 0, 2, 15, D1, D0, CKL

SSR-10A

• Description: A solid-state relay for controlling high power devices.
• Pins: 1-in, 2-out, -, +

120 fan 12v

• Description: A 12V fan for cooling or ventilation.
• Pins: 12V+, GND

12v power supply

• Description: A power supply unit providing 12V DC output.
• Pins: +, -

Wiring Details

Buzzer

• PIN connected to ESP32-WROOM-32UE pin 12
• GND connected to common ground net

LED: Two Pin (red)

• cathode connected to common ground net
• anode connected to one end of the Resistor

MQ-135 SENSOR AIR QUALITY

• VCC connected to ESP32-WROOM-32UE 5V
• GND connected to common ground net
• A0 not connected in the provided net list
• D0 connected to ESP32-WROOM-32UE pin 15

BME/BMP280

• GND connected to common ground net
• SCL connected to ESP32-WROOM-32UE pin 22
• SDA connected to ESP32-WROOM-32UE pin 21
• VIN connected to ESP32-WROOM-32UE 3v3

Resistor

• pin1 connected to LED anode
• pin2 connected to ESP32-WROOM-32UE pin 14

ESP32-WROOM-32UE

• 3v3 connected to BME/BMP280 VIN
• 5V connected to MQ-135 SENSOR AIR QUALITY VCC
• GND connected to common ground net
• 12 connected to Buzzer PIN
• 14 connected to Resistor pin2
• 15 connected to MQ-135 SENSOR AIR QUALITY D0
• 21 connected to BME/BMP280 SDA
• 22 connected to BME/BMP280 SCL
• 13 connected to SSR-10A +

SSR-10A

• 1-in connected to 12v power supply +
• 2-out connected to 120 fan 12v 12V+
• - connected to common ground net
• + connected to ESP32-WROOM-32UE pin 13

120 fan 12v

• 12V+ connected to SSR-10A 2-out
• GND connected to 12v power supply -

12v power supply

• + connected to SSR-10A 1-in
• - connected to 120 fan 12v GND

Documented Code

No code was provided in the input. The ESP32-WROOM-32UE microcontroller would typically be programmed to read sensor data, control the LED and buzzer for alerts, and manage the power to the fan via the SSR-10A based on sensor inputs and possibly other logic. The code would be responsible for initializing the sensors, reading their values, implementing control logic, and handling communication if needed.