// Mission Test My Idea code cpp.

// 
#include <LiquidCrystal.h>
LiquidCrystal lcd16(12,11,10,9,8,7);


// HC-SR04
int trig = 2;
int echo = 3;
int bz = 13;

// 
long duration = 0;
int cm = 0;
int inch = 0;

void setup() {

  Serial.begin(9600);

  lcd16.begin(16,2);
  lcd16.setCursor(0,0);
  lcd16.print("Measure Distance");

  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(bz, OUTPUT);
}

void loop() {

  Serial.print("CM  : ");
  Serial.println(cm);

  // ส่งคลื่นเสียง 1 Ware
  digitalWrite(trig , LOW);
  digitalWrite(trig, HIGH);
  digitalWrite(trig, LOW);

  duration = pulseIn(echo,HIGH);
  cm = duration*0.034/2;
  inch = duration*0.0133/2;
  Serial.print("CM: ");
  Serial.println(cm);

  checkCM(cm);

  //Data of Row 1 (TOP ROW)
  lcd16.setCursor(0, 1);
  lcd16.print("Value CM :");
  lcd16.setCursor(11, 1);
  lcd16.println(float(cm));

  delay(200);

}

void checkCM(int NUM) {
  if(cm <= 300) {
    digitalWrite(bz, !HIGH);
    tone(13, 2000, 50);
  }
  if(cm <= 200) {
    digitalWrite(bz, !HIGH);
    tone(13, 2300, 25);
  }
  if(cm <= 100){
    digitalWrite(bz, !HIGH);
    tone(13, 2500, 10); // tone(pinMode[ระบุ pin ที่ใช้งาน], ความถี่เสี่ยง Hz , ระยะเวลา sec )
    }
    else{
    digitalWrite(bz, LOW);
    }
    
}