#define TRIG 32
#define ECHO 18
#define LED1 26
#define LED2 19

void setup() {
  pinMode (TRIG, OUTPUT);
  pinMode (ECHO, INPUT);
  pinMode (LED1, OUTPUT);
  pinMode (LED2, OUTPUT);
}

void loop() {
  digitalWrite(TRIG, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG, LOW);

  long time = pulseIn(ECHO, HIGH);
  int distance = time * 0.034 / 2;

  if (distance < 20) {
    digitalWrite(LED1, HIGH);
    digitalWrite(LED2, LOW);
  } else {
    digitalWrite(LED1, LOW);
    digitalWrite(LED2, HIGH);
  }

  delay(100);
}