Circuit Documentation

Summary

This circuit integrates an Arduino UNO, an ESP32, various sensors, a relay module, an LCD display, a motor driver, and other components to create a comprehensive system. The Arduino UNO serves as the primary microcontroller, interfacing with sensors and actuators, while the ESP32 provides additional processing power and connectivity. The system includes a light sensor, temperature and humidity sensor, flame sensor, relay module, LCD display, and a fan controlled by a motor driver.

Component List

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

1 Channel 5V Relay Module

• Description: A relay module used to control high voltage devices.
• Pins: VCC+, VCC- (GND), IN, N.O., COM, N.C.

16x2 I2C LCD

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

ESP32 (30 pin)

• Description: A low-cost, low-power system on a chip microcontroller with integrated Wi-Fi and dual-mode Bluetooth.
• 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

Photosensitive Sensor Module Digital Light Intensity Detection

• Description: A sensor module used to detect light intensity.
• Pins: Analog Output, Digital Output, Ground, VCC

DHT 11

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

Flame Sensor

• Description: A sensor used to detect flame or fire.
• Pins: A0, GND, D0, VCC

Resistor

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

12v Power Supply

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

LED: Two Pin (red)

• Description: A red LED.
• Pins: cathode, anode

Fan

• Description: A fan used for cooling.
• Pins: GND, 5V

L298N DC Motor Driver

• Description: A dual H-Bridge motor driver.
• Pins: OUT1, OUT2, 12V, GND, 5V, OUT3, OUT4, 5V-ENA-JMP-I, 5V-ENA-JMP-O, +5V-J1, +5V-J2, ENA, IN1, IN2, IN3, IN4, ENB

Wiring Details

Arduino UNO

• 3.3V connected to ESP32 Vin
• 5V connected to 16x2 I2C LCD VCC, Photosensitive Sensor Module VCC, DHT 11 VCC, Flame Sensor VCC
• GND connected to 16x2 I2C LCD GND, Photosensitive Sensor Module Ground, DHT 11 GND, Flame Sensor GND, L298N DC Motor Driver GND, 1 Channel 5V Relay Module VCC- (GND), 1 Channel 5V Relay Module COM, 12v Power Supply -, LED cathode, ESP32 GND
• A4 connected to 16x2 I2C LCD SDA
• A5 connected to 16x2 I2C LCD SCL
• D13 connected to ESP32 RX2
• D12 connected to ESP32 TX2
• D11 connected to Photosensitive Sensor Module Digital Output
• D10 connected to DHT 11 DATA
• D9 connected to Flame Sensor D0
• D8 connected to 1 Channel 5V Relay Module IN
• D7 connected to L298N DC Motor Driver IN2
• D6 connected to L298N DC Motor Driver IN1
• D5 connected to L298N DC Motor Driver ENA

1 Channel 5V Relay Module

• VCC+ connected to 12v Power Supply +, L298N DC Motor Driver 12V
• N.O. connected to Resistor pin2

16x2 I2C LCD

• VCC connected to Arduino UNO 5V
• GND connected to Arduino UNO GND
• SDA connected to Arduino UNO A4
• SCL connected to Arduino UNO A5

ESP32 (30 pin)

• Vin connected to Arduino UNO 3.3V
• GND connected to Arduino UNO GND
• RX2 connected to Arduino UNO D13
• TX2 connected to Arduino UNO D12

Photosensitive Sensor Module Digital Light Intensity Detection

• VCC connected to Arduino UNO 5V
• Ground connected to Arduino UNO GND
• Digital Output connected to Arduino UNO D11

DHT 11

• VCC connected to Arduino UNO 5V
• GND connected to Arduino UNO GND
• DATA connected to Arduino UNO D10

Flame Sensor

• VCC connected to Arduino UNO 5V
• GND connected to Arduino UNO GND
• D0 connected to Arduino UNO D9

Resistor

• pin1 connected to LED anode
• pin2 connected to 1 Channel 5V Relay Module N.O.

12v Power Supply

• + connected to 1 Channel 5V Relay Module VCC+, L298N DC Motor Driver 12V
• - connected to Arduino UNO GND

LED: Two Pin (red)

• cathode connected to Arduino UNO GND
• anode connected to Resistor pin1

Fan

• GND connected to L298N DC Motor Driver OUT1
• 5V connected to L298N DC Motor Driver OUT2

L298N DC Motor Driver

• GND connected to Arduino UNO GND
• 12V connected to 12v Power Supply +
• IN2 connected to Arduino UNO D7
• IN1 connected to Arduino UNO D6
• ENA connected to Arduino UNO D5
• OUT1 connected to Fan GND
• OUT2 connected to Fan 5V

Documented Code

Arduino UNO Code (sketch.ino)

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

}

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

}

Additional Documentation (documentation.txt)

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