arduino/led_touch/led_touch.pde

   1 //TOUCH SENSING BETA - LED TURNS ON WHEN LIGHT IS PRESENT
   2 //BY: RICARDO DE LEMOS 1/17/2007
   3 int led1 = 13;
   4 int cath = 2; // negative
   5 int ando = 3;  // positive
   6
   7 void setup()
   8  {
   9    pinMode(led1, OUTPUT);
  10    pinMode(cath, OUTPUT);
  11    pinMode(ando, OUTPUT);
  12    //Serial.begin(9600);
  13  }
  14
  15 int dela = 20;
  16 int last = HIGH;
  17 int shine = HIGH;
  18
  19 void loop()
  20  {
  21    //TURN SENSOR LED ON
  22    pinMode(ando, OUTPUT);
  23    if(shine) {
  24      digitalWrite(cath, LOW);
  25      digitalWrite(ando, HIGH);
  26      delay(100);
  27    }
  28
  29    //REVERSE BIAS + CHARGE LED
  30    digitalWrite(cath, HIGH);
  31    digitalWrite(ando, LOW);
  32    //delay(dela);
  33
  34    //READ LED CAP
  35    pinMode(ando, INPUT);
  36    delay(dela);
  37    int state = digitalRead(ando);
  38
  39    //SWITCH
  40    if((state != last) && state == LOW) shine = !shine;
  41    last = state;
  42
  43    //DEBUG LED
  44    if(state) {
  45      digitalWrite(led1,HIGH);
  46    } else {
  47      digitalWrite(led1,LOW);
  48    }
  49  }
  50
  51