Double click "Laser On" Double click "Laser Off" - Arduino - c++

Question

Thank you all for your time.
I Have my code that when I keep holding the button the laser turn on "HIGH"
when I release my finger from the button the laser turns off "LOW"
But I want when I double click the laser turn on and when I double click again the laser turn off.
Thank you and sorry for my bad English.
const int btn = 6;// The push button
int previousButtonStateLAZER = HIGH; // for btn6
void setup(){
pinMode(btn, INPUT);
pinMode (laserPin, OUTPUT);
}
void loop(){
int buttonStateLAZER = digitalRead(btn);
// if the button state has changed,
if (buttonStateLAZER != previousButtonStateLAZER){
if( buttonStateLAZER == HIGH ) {
digitalWrite (laserPin, HIGH);
}else{
digitalWrite (laserPin, LOW);
}
}
previousButtonStateLAZER = buttonStateLAZER;
}```

Answer 1

You need to store the last two times that a click was detected and then test to see if they occurred close enough together. Try this code out (edited from what you posted):
const int btn = 6;// The push button
int previousButtonStateLAZER = LOW; // for btn6
static long releaseTimes[2];
static int releaseIndex = 1;
static int laserStates[2];
static int laserIndex = 0;
void setup(){
pinMode(btn, INPUT);
pinMode (laserPin, OUTPUT);
releaseTimes[0] = 0;
releaseTimes[1] = 0;
laserStates[0] = LOW;
laserStates[1] = HIGH;
}
void loop(){
int buttonStateLAZER = digitalRead(btn);
// if the button state has changed,
if (buttonStateLAZER != previousButtonStateLAZER){
previousButtonStateLAZER = buttonStateLAZER;
if (buttonStateLAZER == HIGH) {
return;
}
releaseIndex = 1 - releaseIndex;
releaseTimes[releaseIndex] = millis();
if (abs(releaseTimes[0] - releaseTimes[1]) < 800) {
releaseTimes[0] = 0;
releaseTimes[1] = 0;
laserIndex = 1 - laserIndex;
digitalWrite(laserPin, laserStates[laserIndex]);
}
}
}