#define ECHO_PIN 5
#define TRIG_PIN 6

void setup() 
{
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(LED_BUILTIN, OUTPUT);
  Serial.begin(115200);
}

void loop() 
{
    float distance = readDistance();
    bool nearby = distance < 100;
    digitalWrite(LED_BUILTIN,nearby);

    Serial.print("Measured Distance: ");
    Serial.println(readDistance());
    Serial.print("Measured Bool: ");
    Serial.println(nearby);
    delay(1000);
}

float readDistance() 
{
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  return duration * 0.034 / 2;
}