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Attiny85_2LED_touch.ino
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Attiny85_2LED_touch.ino
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// 2 LED blink code using capacitive touch
// 2019-01-26
//
// based on the code by high-low tech
// see: http://highlowtech.org/?p=1653
//
// Modifications by Pierre
// http://ictoblog.nl
//
// diagram:
// attiny85
// reset -+---+- power
// (fading always) pb3 -+* +- pb2 (touch input)
// (fading while touching) pb4 -+ +- pb1 (not used)
// ground -+---+- pb0 (not used)
int fadepin1 = 3; // the led that fades on and off
int fadepin2 = 4; // the led that fades on and off while you're touching the input pin
int touchpin = 2; // the touch input
int calibration = 0;
int randomval = 0;
int fadeval = 0, fadestep = 1;
int togglestate = LOW;
void setup()
{
pinMode(fadepin1, OUTPUT);
pinMode(fadepin2, OUTPUT);
delay(100);
for (int i = 0; i < 8; i++) {
calibration += chargeTime(touchpin);
delay(20);
}
calibration = (calibration + 4) / 8;
}
void loop()
{
int n = chargeTime(touchpin);
analogWrite(fadepin1, fadeval);
if (n > calibration) analogWrite(fadepin2, fadeval);
else analogWrite(fadepin2, 0);
fadeval = fadeval + fadestep;
if (fadeval == 255) fadestep = -1;
if (fadeval == 0) fadestep = 1;
delayMicroseconds(500);
}
byte chargeTime(byte pin)
{
byte mask = (1 << pin);
byte i;
DDRB &= ~mask; // input
PORTB |= mask; // pull-up on
for (i = 0; i < 16; i++) {
if (PINB & mask) break;
}
PORTB &= ~mask; // pull-up off
DDRB |= mask; // discharge
return i;
}