Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes various components such as an ESP32 microcontroller, sensors, a relay module, a fan, and a buzzer. The circuit is designed to monitor environmental conditions and control a fan based on sensor inputs. The ESP32 microcontroller serves as the central control unit, interfacing with the sensors and actuators.

Component List

1. 40 Fan 12v

   • Description: A 12V DC fan.
   • Pins: +12V, -12V

2. Relay module 5v-30v

   • Description: A relay module capable of switching voltages between 5V and 30V.
   • Pins: common contact, normally open, normally closed, trigger, V-, V+

3. ESP32

   • Description: A versatile microcontroller with Wi-Fi and Bluetooth capabilities.
   • Pins: EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, GND, VIN, 3V3, D15, D2, D4, RX2, TX2, D5, D18, D19, D21, RX0, TX0, D22, D23, BOOT

4. MQ-3 Breakout

   • Description: An alcohol sensor module.
   • Pins: VCC, GND, DO, AO

5. DHT11

   • Description: A temperature and humidity sensor.
   • Pins: DATA, GND, VCC

6. Buzzer

   • Description: An electronic buzzer.
   • Pins: PIN, GND

7. Voltage Sensor

   • Description: A sensor to measure voltage.
   • Pins: Ground, Phase, Vcc, Out, Gnd

8. 12V Battery (Small Size)

   • Description: A small-sized 12V battery.
   • Pins: VCC, GND

Wiring Details

40 Fan 12v

• +12V is connected to the normally open pin of the Relay module 5v-30v and the Phase pin of the Voltage Sensor.
• -12V is connected to the Ground pin of the Voltage Sensor and the GND pin of the 12V Battery (Small Size).

Relay module 5v-30v

• common contact is connected to the VCC pin of the 12V Battery (Small Size).
• normally open is connected to the +12V pin of the 40 Fan 12v and the Phase pin of the Voltage Sensor.
• trigger is connected to the D4 pin of the ESP32.
• V- is connected to the GND pin of the ESP32, GND pin of the DHT11, GND pin of the buzzer, GND pin of the MQ-3 Breakout, and the Gnd pin of the Voltage Sensor.
• V+ is connected to the VIN pin of the ESP32, VCC pin of the DHT11, Vcc pin of the Voltage Sensor, and the VCC pin of the MQ-3 Breakout.

ESP32

• D5 is connected to the PIN of the buzzer.
• GND is connected to the GND pin of the DHT11, V- pin of the Relay module 5v-30v, Gnd pin of the Voltage Sensor, GND pin of the buzzer, and the GND pin of the MQ-3 Breakout.
• D4 is connected to the trigger pin of the Relay module 5v-30v.
• VIN is connected to the VCC pin of the DHT11, V+ pin of the Relay module 5v-30v, Vcc pin of the Voltage Sensor, and the VCC pin of the MQ-3 Breakout.
• D34 is connected to the DO pin of the MQ-3 Breakout.
• VP is connected to the AO pin of the MQ-3 Breakout.
• D12 is connected to the Out pin of the Voltage Sensor.
• D15 is connected to the DATA pin of the DHT11.

MQ-3 Breakout

• VCC is connected to the VIN pin of the ESP32, VCC pin of the DHT11, V+ pin of the Relay module 5v-30v, and the Vcc pin of the Voltage Sensor.
• GND is connected to the GND pin of the ESP32, GND pin of the DHT11, V- pin of the Relay module 5v-30v, Gnd pin of the Voltage Sensor, and the GND pin of the buzzer.
• DO is connected to the D34 pin of the ESP32.
• AO is connected to the VP pin of the ESP32.

DHT11

• DATA is connected to the D15 pin of the ESP32.
• GND is connected to the GND pin of the ESP32, V- pin of the Relay module 5v-30v, Gnd pin of the Voltage Sensor, GND pin of the buzzer, and the GND pin of the MQ-3 Breakout.
• VCC is connected to the VIN pin of the ESP32, V+ pin of the Relay module 5v-30v, Vcc pin of the Voltage Sensor, and the VCC pin of the MQ-3 Breakout.

Buzzer

• PIN is connected to the D5 pin of the ESP32.
• GND is connected to the GND pin of the ESP32, GND pin of the DHT11, V- pin of the Relay module 5v-30v, Gnd pin of the Voltage Sensor, and the GND pin of the MQ-3 Breakout.

Voltage Sensor

• Ground is connected to the -12V pin of the 40 Fan 12v and the GND pin of the 12V Battery (Small Size).
• Phase is connected to the +12V pin of the 40 Fan 12v and the normally open pin of the Relay module 5v-30v.
• Vcc is connected to the VIN pin of the ESP32, VCC pin of the DHT11, V+ pin of the Relay module 5v-30v, and the VCC pin of the MQ-3 Breakout.
• Out is connected to the D12 pin of the ESP32.
• Gnd is connected to the GND pin of the ESP32, GND pin of the DHT11, V- pin of the Relay module 5v-30v, GND pin of the buzzer, and the GND pin of the MQ-3 Breakout.

12V Battery (Small Size)

• VCC is connected to the common contact pin of the Relay module 5v-30v.
• GND is connected to the Ground pin of the Voltage Sensor and the -12V pin of the 40 Fan 12v.

Code

No code is provided for this circuit.