/*
Button as switch
Original David A. Mellis 2006
Modified Mauro Herrero - Fab Academy 2021
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, ignoring noise
*/

//set constants, according to attiny pinout
const int button = 3;
const int blue = 4;

//set variable - buttonstate
int blueState = 0;
int reading;
int lastRead = 0;

// The following variables are longs because the time is measured in milliseconds, 
// and will be a huge number
long time = 0; // last time the output pin was changed
long debounce = 100; // debounce time

void setup() {
  // put your setup code here, to run once:
    pinMode(blue, OUTPUT);
    pinMode(button, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
    reading = digitalRead(button);
    
    if (reading == HIGH && lastRead == LOW && millis()-time > debounce){
        if (blueState == HIGH)
            blueState = LOW;
        else
            blueState = HIGH;

        time = millis();
    }
    digitalWrite(blue, blueState);
    // lastRead = reading;
}