// ตัวอย่าง การเขียนโปรแกรมบอร์ด Multi Function - Arduino uno r3  
// LAB31  HC-SR04  & TM1637
// ครูวิบูลย์ กัมปนาวราวรรณ จันทร์ 1 กรกฏาคม 2567

#include <TM1637.h>

const int CLK = 10;// Pin definitions for TM1637
const int DIO = 11;

TM1637 tm(CLK, DIO);// Create an instance of the TM1637 class

const int trigPin = 3;// Pin definitions for HC-SR04
const int echoPin = 2;

// Pin definitions for LED and Buzzer
const int ledPin = 13;
const int buzzerPin = 12;

long duration;
float distance;

void setup() { 
  Serial.begin(9600); // Initialize the Serial Monitor

  // Set up the pins for the ultrasonic sensor, LED, and Buzzer
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);

  // Initialize the TM1637 display
  tm.init();
  tm.set(7);  // Set brightness (0-7)
}

void loop() { 
  digitalWrite(trigPin, LOW); // Clear the trigPin
  delayMicroseconds(5);
  
  // Set the trigPin HIGH for 10 microseconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Read the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);

  // Calculate the distance
  distance = duration * 0.034 / 2;

  // Display the distance on Serial Monitor
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  // Display the distance on the 7-segment display
  int displayValue = (int)distance;

  int digit1 = displayValue / 1000 % 10;  // Thousands place
  int digit2 = displayValue / 100 % 10;   // Hundreds place
  int digit3 = displayValue / 10 % 10;    // Tens place
  int digit4 = displayValue % 10;         // Units place

  tm.display(0, digit1);  // Display thousands place
  tm.display(1, digit2);  // Display hundreds place
  tm.display(2, digit3);  // Display tens place
  tm.display(3, digit4);  // Display units place

  // Control the LED and Buzzer based on distance
  if (distance > 30) {
    digitalWrite(ledPin, HIGH);  // LED on
    tone(buzzerPin, 1000);       // Buzzer sound at 1kHz
  } else {
    digitalWrite(ledPin, LOW);   // LED off
    noTone(buzzerPin);           // Buzzer off
  }

  delay(300);
}