#define sw1 4
unsigned int vr1;
float volte1;

void setup() {
  Serial.begin(9600);
  DDRB=0b111111;
  PORTB = 0b000000;
  pinMode(sw1,INPUT_PULLUP);
}
void loop() {
    vr1 = analogRead(A0);
    volte1 = vr1*5/1023.0;
    if(vr1>500){
      PORTB = 0b11100;
    }else if(vr1<=500){
      PORTB = 0b00011;
    }
    
    String mes;
    mes = "vr1 = "+String(vr1);
    mes = mes + " volte1 = "+String(volte1);
    if(digitalRead(sw1)==LOW){
      Serial.println(mes);
      while(digitalRead(sw1)==LOW){delay(20);}
    }
}