Heating Pad Hand Warmer Blanket

Contributors: HelloTechie

Example Code

language:c
  /*

 Heating Pad Hand Warmer Blanket Code Example
  SparkFun Electronics, Pamela, 1/24/2013
  Beerware License

  Hardware Connections:
  -led1 = D9;
  -led2 = D10;
  -led3 = D11;
  -button = D2;
  -Mofset = D3;

  Usage: 
  Hit the switch to power, hit the button to adjust how warm the heating elements get, and three LEDs will indicate low, medium, and high levels. 
 */

int btnPin = 2;
boolean btnPressed = false;
int fetPin = 3;
int led1 = 9;
int led2 = 10;
int led3 = 11;
int mode;

void setup() {                
  // initialize the digital pin as an output.
  pinMode(btnPin, INPUT_PULLUP);  //set internal pull-up resistor for button
  pinMode(fetPin, OUTPUT);  
  pinMode(led1, OUTPUT);  
  pinMode(led2, OUTPUT);  
  pinMode(led3, OUTPUT);  
}

// the loop routine runs over and over again forever:
void loop() {
  //Increment mode on depress, unless mode = 3, then reset to 0
  if (btnPressed && digitalRead(btnPin) == LOW)
    mode = mode == 3 ? 0 : mode + 1;
  //Assign button state
  btnPressed = digitalRead(btnPin);
  switch (mode)
  {
    case 0:
      analogWrite(fetPin, 0); //off
      digitalWrite(led1, LOW);
      digitalWrite(led2, LOW);
      digitalWrite(led3, LOW);
      break;
    case 1:
      analogWrite(fetPin, 85); //33% duty cycle
      digitalWrite(led1, HIGH);
      digitalWrite(led2, LOW);
      digitalWrite(led3, LOW);
      break;
    case 2:
      analogWrite(fetPin, 170); //66% duty cycle
      digitalWrite(led1, HIGH);
      digitalWrite(led2, HIGH);
      digitalWrite(led3, LOW);
      break;
    case 3:
      analogWrite(fetPin, 255); //100% duty cycle
      digitalWrite(led1, HIGH);
      digitalWrite(led2, HIGH);
      digitalWrite(led3, HIGH);
      break;
  }
}

There you go! As with any DIY project, you should always customize and tweak what you want for maximum awesomeness.