Evil Pumpkin

I'm from Europe and we’re not celebrating Halloween, but I always wanted to carve a pumpkin.

So I’ve bought one and I carved it. At first I thought that a simple candle inside would be enough, but then I decided to go with arduino, LED, speaker and distance sensor. I’ve used my Nano, and for sensor I used my IR sensor. Here’s the video and code.

code:

int IRSense = A0;

int IRTrans = 2;

int Flick = 10;

int valueAmbient = 0;

void setup() {

 pinMode(IRSense, INPUT);

 pinMode(IRTrans, OUTPUT);

 digitalWrite(IRTrans,LOW);

}

void ambient()

{

 digitalWrite(IRTrans,HIGH);

 delay(20); 

 valueAmbient = analogRead(IRSense);

 delay(20);

}

void loop() 

{

 ambient();

 digitalWrite(IRTrans,LOW);

 delay(20);

 int value = analogRead(IRSense);

 int value2 = round(value - valueAmbient);

 int dist = (((value2+15.0)/(value2*(value2+100.0)))*2000.0);

 if(dist<20) 

  {

   analogWrite(Flick,random(0,256));

   tone(8, 38);

  }

 else

  {

   analogWrite(Flick,0);

   noTone(8);

  } 

}