Personal Desk Fan

Your very own desk fan. Component List:

• 1 x Arduino Uno R3
• 1 x SG90 Servo Motor
• 1 x Hobby Motor
• 1 x IR Remote and Receiver
• 1 x Fan Blade
• 1 x 1N4001 Diode
• 1 x 2N2222 Transistor
• 1 x Ceramic Capacitor (104)
• Jumper wires (male-to-male)
• Jumper wires (male-to-female)

Wiring Guide:

1. Arduino Uno R3

• Power (5V):
  • Connect the 5V pin on the Arduino to the positive rail of the breadboard.
• Ground (GND):
  • Connect a GND pin on the Arduino to the ground rail of the breadboard.

2. SG90 Servo Motor

• Signal Pin (Yellow):
  • Connect to Digital Pin 9 on the Arduino.
• Power Pin (Red):
  • Connect to the 5V rail on the breadboard.
• Ground Pin (Brown):
  • Connect to the GND rail on the breadboard.

3. Hobby Motor (DC Motor)

• Motor + Terminal:
  • Connect to the Collector (C) pin of the 2N2222 transistor and + terminal of the Diode
• Motor - Terminal:
  • Connect to the GND terminal of the diode
• The diode is used for flyback protection to prevent voltage spikes when the motor turns off.

Ceramic Capacitor

• Place the capacitor on the motor leads itself + and -
• This stabilizes the whole circuit, the circuit will not work properly if this is not added for the motor.

4. 2N2222 Transistor

• Collector (C):
  • Connect to the - terminal of the hobby motor and Diode
• Emitter (E):
  • Connect to the GND rail on the breadboard
• Base (B):
  • Connect to Digital Pin 6 on the Arduino through a 1kΩ resistor (if not mentioned but recommended for base current limiting).

5. IR Receiver

• VCC Pin:
  • Connect to the 5V rail on the breadboard.
• GND Pin:
  • Connect to the GND rail on the breadboard.
• Signal Pin:
  • Connect to Digital Pin 8 on the Arduino.

6. Fan Blade

• Attach the fan blade to the shaft of the hobby motor. Ensure it is securely fastened.

7. Jumper Wires

• Male-to-Male Wires:
  • Use these to make connections between the breadboard and Arduino or other components.

8. External Power

• Can be a 4xAA battery pack or even the HW-131 set to 5v with a power adapter
  • VCC Pin:
    • Connect to the 5V rail on the breadboard.
  • GND Pin:
    • Connect to the GND rail on the breadboard.
    • Important: Connect the ground of the external power source to the ground of the Arduino (Common Ground)
  • Connect the Servo motor and Hobby Motor to the ground and VCC of this external power supply. Your Arduino is unable to power these parts through the USB only.

Code:

  #include <IRremote.hpp>
  #define RECV_PIN 8
  #include <Servo.h>

  Servo myServo;  // Create a servo object
  int pos = 90;    // Variable to store the servo position
  int increment = 4; // Variable to control the direction of movement
  unsigned long previousMillis = 0; // Stores the last time the servo was updated
  const long interval = 1; // Interval at which to update the servo position (in milliseconds)
  
  int motor=6;
  int powerFlag=0;
  int speed=0;
  int swing=0;
  int remoteSpeed=5;

  void setup()
    {myServo.attach(9); // Attach the servo to pin 9
    Serial.begin(115200); // Establish serial communication
    IrReceiver.begin(RECV_PIN, ENABLE_LED_FEEDBACK); // Start the receiver
    pinMode(motor, OUTPUT); //Set pin 10 as an Output
    }

void loop() {

  if (IrReceiver.decode()) {
      //Serial.println(IrReceiver.decodedIRData.decodedRawData, HEX); // Print "old" raw data
      IrReceiver.printIRResultShort(&Serial); // Print complete received data in one line
      IrReceiver.printIRSendUsage(&Serial);   // Print the statement required to send this data
      IrReceiver.resume(); // Enable receiving of the next value

  Serial.println(IrReceiver.decodedIRData.decodedRawData);

  switch(IrReceiver.decodedIRData.decodedRawData)
      {case 0xE31CFF00: //Ok Button
        if(powerFlag==1)
          powerFlag=0;
        else
          powerFlag=1;
        break;
      case 0xBA45FF00: //1 Button
          remoteSpeed=1;
          break;
      case 0xB946FF00: //2 Button
          remoteSpeed=2;
          break;
      case 0xB847FF00: //3 Button
          remoteSpeed=3;
          break;
      case 0xBB44FF00: //4 Button
          remoteSpeed=4;
          break;
      case 0xBF40FF00: //5 Button
          remoteSpeed=5;
          break;
      case 0xBC43FF00: //6 Button
          remoteSpeed=6;
          break;
      case 0xF807FF00: //7 Button
          remoteSpeed=7;
          break;
      case 0xEA15FF00: //8 Button
          remoteSpeed=8;
          break;
      case 0xF609FF00: //9 Button
          remoteSpeed=9;
          break;
      case 0xE916FF00: //* Button
        if(swing==1)
          swing=0;
        else
          swing=1;
          break;
           
      
      case 0xE718FF00:
      if (increment>0 && increment<=11)
        increment +=2;
      else if(increment<0 && increment>=-11)
        increment -=2;
      break;
      
      case 0xAD52FF00:
      if (increment>2)
        increment -=2;
      else if(increment<0 && increment<=-11)
        increment +=2;
      break;
      }
  }
  
  
  speed = map(remoteSpeed,1,9,50,150); //range goes up to 255, but your power source should be able to handle it. 4 x AA can do 250, 1A External Power supply can do 150.

  if(powerFlag==1)
    analogWrite(motor,speed);
  else
    analogWrite(motor,0);

    Serial.println(speed);

  unsigned long currentMillis = millis();

  // Check if it's time to update the servo position
  if(powerFlag==1 && swing==1)
  {if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;
  
    // Update the servo position
    pos += increment;
    myServo.write(pos);

    // Reverse the direction at the ends of the sweep
    if (pos <= 0 || pos >= 180) {
      increment = -increment;
    }}
  }

delay(100);

}

 
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