hyvee.ino

// Double-check that these pins are correct.

const int sensorPin = 9;
const int relayPin = 10;
const int threshold = 50;

void setup() {
  Serial.begin(9600);
  pinMode(sensorPin, INPUT);
  pinMode(relayPin, OUTPUT);
  digitalWrite(relayPin, HIGH);
}

void loop() {
  long distance = pulseIn(sensorPin, HIGH) / 147;

  if (distance < threshold && distance != 0) {
    Serial.println(distance);
  }

}