/*
  HC-SR04 Ultrasonic Sensor Example.

*/
#include <TM1637Display.h>

const int CLK = 7;  
const int DIO = 6;  
TM1637Display display(CLK, DIO);

#define ECHO_PIN 3
#define TRIG_PIN 2

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



 
  display.setBrightness(5);  //brightness


}

float readDistanceCM() {
  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;
}

void loop() {
  float distance = readDistanceCM();

  bool isNearby = distance < 100;
  
   if (distance > 9999) {
    display.showNumberDec(9999);    } else {
    display.showNumberDec(distance, false);  
  }
  Serial.print("Measured distance: ");
  Serial.println(readDistanceCM());

  delay(100);
}