Capacitive touch switch

Parts Required:

–  ATTINY85
–  Touch Sensor
–  LED (1)
–  Wires to connect it all together

Touch Button as On/ Off Switch (Attiny85):

• upload this code to Attiny (How To Upload code to Attiny)
• connect all  Parts together

ATTiny85 Pinout:

Arduino Code:

/* switch
*
* Each time the input pin goes from LOW to HIGH (e.g. because of a push-button
* press), the output pin is toggled from LOW to HIGH or HIGH to LOW.  There's
* a minimum delay between toggles to debounce the circuit (i.e. to ignore
* noise).  
*
* David A. Mellis
* 21 November 2006
*/

int inPin = 2;         // the number of the input pin
int outPin = 3;       // the number of the output pin
int state = HIGH;      // the current state of the output pin
int reading;           // the current reading from the input pin
int previous = LOW;    // the previous reading from the input pin

// the follow variables are long’s because the time, measured in miliseconds,
// will quickly become a bigger number than can be stored in an int.

long time = 0;         // the last time the output pin was toggled
long debounce = 200;   // the debounce time, increase if the output flickers

void setup()
{
pinMode(inPin, INPUT);
pinMode(outPin, OUTPUT);
}

void loop()
{
reading = digitalRead(inPin);

// if the input just went from LOW and HIGH and we’ve waited long enough
// to ignore any noise on the circuit, toggle the output pin and remember
// the time
if (reading == HIGH && previous == LOW && millis() – time > debounce) {
if (state == HIGH)
state = LOW;
else
state = HIGH;
time = millis();
}

digitalWrite(outPin, state);
previous = reading;
}

Download: Button

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