Set/ Reset

How to do a set/reset in Arduino with only one button?

(deleted)

Pablo1006:
How to do a set/reset in Arduino with only one button?

Not a lot of detail here. Set / reset what? An output an LED or the machine.

At a guess I would look at the state change detect in the File -> Examples -> 02Digital menu.

Switch LED_BUILTIN on/off with one button.

#include <Bounce2.h>

const byte button = 3;
const byte ledPin = LED_BUILTIN;
byte ledState = LOW;

Bounce key;

void setup() {
  pinMode(ledPin, OUTPUT);
  key.attach(button, INPUT_PULLUP); // button closing to GND
}

void loop() {
  if (key.update() && key.fell()) {
    ledState = !ledState;
  }
  digitalWrite(ledPin, ledState);
}