#define sensorPin 4
#define LedAzul 23
#define LedVerde 22
#define LedAmarelo 21
#define Buzzer 2
#define Botao 5
int value = 0;

int button_state = 0;   
float voltage;
void setup()
  {
  
  pinMode(LedAmarelo, OUTPUT);
  pinMode(LedVerde, OUTPUT);
  pinMode(LedAzul, OUTPUT);
  pinMode(Buzzer, OUTPUT);
  pinMode(Botao, INPUT_PULLUP);

Serial.begin(115200);

}
void loop()
{
  voltage = analogRead(sensorPin);
  Serial.print("valor do AD: ");
  Serial.println(voltage);

  voltage = (3,3*voltage)/4095;
  Serial.print("tensao: ");
  Serial.println(voltage); 
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation

  if(voltage < 2){
    digitalWrite(23, HIGH);
    digitalWrite(22, HIGH);
    digitalWrite(21, HIGH);
  }
  else if (voltage >= 2 && voltage <= 2.3){
    digitalWrite(23, LOW);
    digitalWrite(22, HIGH);
    digitalWrite(21, LOW);
  }
  else if(voltage >= 2.3  && voltage <= 2.7){
    digitalWrite(23, LOW);
    digitalWrite(22, LOW);
    digitalWrite(21, HIGH);
  }
button_state = digitalRead(Botao);

  if (button_state == LOW)    
    digitalWrite( sensorPin , HIGH); 
  else                          
    digitalWrite(sensorPin, LOW);  
  tone(Buzzer, 1000);
  delay(10);
};