//TOUCH SENSING BETA - LED TURNS ON WHEN LIGHT IS PRESENT
//BY: RICARDO DE LEMOS 1/17/2007
int led1 = 13;
int cath = 2; // negative
int ando = 3;  // positive

void setup()
 {
   pinMode(led1, OUTPUT);
   pinMode(cath, OUTPUT);
   pinMode(ando, OUTPUT);
   Serial.begin(9600);
 }

void loop()
 {
   //TURN SENSOR LED ON
   digitalWrite(cath, LOW);
   digitalWrite(ando, HIGH);
   delay(80);
   //REVERSE BIAS
   digitalWrite(cath, HIGH);
   digitalWrite(ando, LOW);
   //CHARGE LED
   delay(80);
   //READ LED CAP
   pinMode(ando, INPUT);
   delay(80);
   //WRITE TO LED
   if (digitalRead(ando) == LOW)
   {
     digitalWrite(led1,LOW);
   }
   else
   {
     digitalWrite(led1,HIGH);
   }
   //RESET
   pinMode(ando, OUTPUT);
 }