int l_32 = 32;
int l_33 = 33;
int l_25 = 25;
int sensor = 35;
int leitura = 0;
float tensao = 0.0;

void setup() {
  pinMode(sensor, INPUT);
  pinMode(l_32, OUTPUT);
  pinMode(l_33, OUTPUT);
  pinMode(l_25, OUTPUT);
}

void loop() {
  leitura = analogRead(sensor);
  tensao = leitura*3.3/4095.0;
  digitalWrite(l_32, tensao>2.9);
  digitalWrite(l_33, tensao>2.7);
  digitalWrite(l_25, tensao>2.5);
}