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Arduino UNO-Based Smart Fan Controller with Temperature and Humidity Sensing

Image of Arduino UNO-Based Smart Fan Controller with Temperature and Humidity Sensing

Circuit Documentation

Summary

This circuit involves an Arduino UNO microcontroller, a 12V fan, a DHT11 humidity and temperature sensor, two LEDs (red and blue), resistors, a rectifier diode, and an IRF520 PWM module. The circuit is designed to control the fan and LEDs based on the sensor readings and other 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. 120 fan 12V

    • Description: A 12V cooling fan.
    • Pins: 12V+, GND
  3. Resistor (100 Ohms)

    • Description: A resistor with a resistance of 100 Ohms.
    • Pins: pin1, pin2
  4. LED: Two Pin (red)

    • Description: A red LED.
    • Pins: cathode, anode
  5. LED: Two Pin (blue)

    • Description: A blue LED.
    • Pins: cathode, anode
  6. 1N4007 Rectifier Diode

    • Description: A rectifier diode.
    • Pins: Cathode, Anode
  7. IRF520 PWM

    • Description: A PWM module.
    • Pins: V+, V-, Vin, GND, SIG, Vcc
  8. DHT11 Humidity and Temperature Sensor

    • Description: A sensor for measuring humidity and temperature.
    • Pins: VDD, DATA, NULL, GND
  9. Battery 12V

    • Description: A 12V battery.
    • Pins: +, -

Wiring Details

Arduino UNO

  • 5V connected to:

    • IRF520 PWM (Vcc)
    • DHT11 Humidity and Temperature Sensor (VDD)
  • GND connected to:

    • IRF520 PWM (GND)
    • LED: Two Pin (blue) (cathode)
    • DHT11 Humidity and Temperature Sensor (GND)
    • LED: Two Pin (red) (cathode)
  • D6 connected to:

    • Resistor (pin1)
    • Resistor (pin2)
    • LED: Two Pin (red) (anode)
  • D5 connected to:

    • LED: Two Pin (blue) (anode)
    • Resistor (pin1)
    • Resistor (pin2)
  • D4 connected to:

    • IRF520 PWM (SIG)
  • D3 connected to:

    • DHT11 Humidity and Temperature Sensor (DATA)

120 fan 12V

  • 12V+ connected to:

    • IRF520 PWM (V+)
  • GND connected to:

    • IRF520 PWM (V-)

Resistor (100 Ohms)

  • pin1 connected to:

    • Resistor (pin2)
    • LED: Two Pin (red) (anode)
    • Arduino UNO (D6)
  • pin2 connected to:

    • Resistor (pin1)
    • LED: Two Pin (blue) (anode)
    • Arduino UNO (D5)

LED: Two Pin (red)

  • cathode connected to:

    • Arduino UNO (GND)
  • anode connected to:

    • Resistor (pin1)
    • Resistor (pin2)
    • Arduino UNO (D6)

LED: Two Pin (blue)

  • cathode connected to:

    • Arduino UNO (GND)
  • anode connected to:

    • Resistor (pin1)
    • Resistor (pin2)
    • Arduino UNO (D5)

1N4007 Rectifier Diode

  • Anode connected to:

    • IRF520 PWM (Vin)
    • Battery 12V (+)
  • Cathode connected to:

    • IRF520 PWM (GND)
    • Battery 12V (-)

IRF520 PWM

  • Vcc connected to:

    • Arduino UNO (5V)
  • GND connected to:

    • Arduino UNO (GND)
    • 1N4007 Rectifier Diode (Cathode)
    • Battery 12V (-)
  • SIG connected to:

    • Arduino UNO (D4)
  • V+ connected to:

    • 120 fan 12V (12V+)
  • V- connected to:

    • 120 fan 12V (GND)
  • Vin connected to:

    • 1N4007 Rectifier Diode (Anode)
    • Battery 12V (+)

DHT11 Humidity and Temperature Sensor

  • VDD connected to:

    • Arduino UNO (5V)
  • DATA connected to:

    • Arduino UNO (D3)
  • GND connected to:

    • Arduino UNO (GND)

Battery 12V

  • + connected to:

    • 1N4007 Rectifier Diode (Anode)
    • IRF520 PWM (Vin)
  • - connected to:

    • 1N4007 Rectifier Diode (Cathode)
    • IRF520 PWM (GND)

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:

}

Documentation (documentation.txt)