#define LED  2
#define PUSH 3

int pushState = 0;
int ledState = 0;
int lastPushState =0;

void setup() {
  pinMode(LED, OUTPUT);
  pinMode(PUSH, INPUT_PULLUP);
}

void loop() {
  // put your main code here, to run repeatedly:
       pushState = digitalRead(PUSH);
       
       if( pushState != lastPushState){
          if(lastPushState == 0){
           ledState = !ledState;
           digitalWrite(LED, ledState);
          }
          delay(50);
       }
        lastPushState = pushState;
  delay(1); // this speeds up the simulation
}