The answer is interrupts, an interrupt signal is used here which has the highest priority of all. Another simple example of Interrupts is touch ... In ATmega168/328 based Arduino boards any pins or ...

/* A simple example of a hardware switch debouncer with an interrupt. Button should be connected to GND and via switch debouncer into Arduino pin 2 or any interrupt pin.

Interrupts in Arduino works same as in other microcontrollers ... The programming starts with declaring pin numbers where LEDs and Push Button are connected. Just as explained above in the blink ...

Debouncing button or switch inputs on microcontrollers ... For those wanting to try this out, [stockyu] has included some example Arduino code for others to use. It’s an interesting take on ...

They are Interrupts and millis. When you use the delay (); function in Arduino, you are actually putting the ... the Arduino processor cannot do any other tasks like read from a button, for example.