#define echo 5
#define trig 3
#define luce A0

#define soglia 300

void setup() {
  Serial.begin(9600); // open serial port, set the baud rate to 9600 bps
  pinMode(echo,INPUT);
  pinMode(luce, INPUT);
  pinMode(trig, OUTPUT);
 }

void loop() {
  int l;
  float dist;

  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  dist=pulseIn(echo, HIGH) * 0.034/2;
  l=analogRead(luce);
    
  Serial.print(dist);
  Serial.print(" ");
  Serial.println(l);
  delay(100);     
}