// MCU BASIC: https://www.basic4mcu.com
// DateTime : 2018-12-07 오전 12:35:09
// by Ok-Hyun Park
//
#include <LiquidCrystal.h>
const int rs=12,en=11,d4=5,d5=4,d6=3,d7=2;
LiquidCrystal lcd(7,8,9,10,11,12);
//
#define Temp_set           A0    // 온도 설정의 위한 아날로그 입력
#define NTC                A1    // 온도 측정의 위한 아날로그 입력
#define Ref_Resistor       10000 // NTC에 연결된 직렬 저항값
#define B_Value            4200  // NTC 10KD-5J의 B값
#define NTC_Nomal_Temp     25    // NTC 10KD-5J의 기준 온도값
#define NTC_Nomal_Resistor 10000 // NTC 10KD-5J의 기준 온도에서의 저항값
#define PWM_out            3     // PWM 출력핀 설정
//
int Buzzer=13;
int Sensor=4;
//
int val;
int count=0;
//
void setup(void){
    pinMode(Buzzer,OUTPUT);
    pinMode(Sensor,INPUT);
    pinMode(PWM_out,OUTPUT);
    lcd.begin(16,2);
    Serial.begin(9600);
}
//
void loop(void){
    float Value,Temp; unsigned char PWM_data; unsigned int Temp_set_value;
    Temp_set_value=analogRead(Temp_set); // 온도설정값 A/D변환
    Temp_set_value/=10;                  // 온도설정값/10로 하여 0~51까지 조정되게 함.
    Value=analogRead(NTC);               // NTC값 A/D변환
    Value=Ref_Resistor/(1023/Value-1);   // A/D값은=x*1023/5로 전압값 구함.
                                         // Stein Hart 방정식에 의한 온도값 산출
    Temp=Value/NTC_Nomal_Resistor;       //(R/Ro)
    Temp=log(Temp);                      // log(R/Ro)
    Temp/=B_Value;                       // 1/B*log(R/Ro)
    Temp+=1.0/(NTC_Nomal_Temp+273.15);   // {1/B*log(R/Ro)}+(1/To),To=273.15+NTC_Nomal_Temp
    Temp=1.0/Temp;                       // 역수 취함.
    Temp-=273.15;                        // 화씨에서 섭씨로 바꿈.
    unsigned char k=Temp;                // float형 Temp값을 char형 k값으로 치환
    if(k<=Temp_set_value)PWM_data=0;     // 온도설정값 이하일 때,PWM_out=OFF
    else if(k<(Temp_set_value+25)){      // 온도설정값 이상일 때,PWM_out=k*10,
        k-=Temp_set_value;
        PWM_data=k*10;
    }
    else PWM_data=255;                          // 온도설정값+25℃의 값 이상일 때,PWM_out=255(최대값)
    //
    val=digitalRead(Sensor); // 센서값 읽어옴
    if(val){                 // 장애물 감지가 안되면
        noTone(13);          // 버저가 울리지 않는다
    }
    else{             // 장애물이 감지되면
        tone(13,220); // 버저가 울린다
        PWM_data=25;  // 255의 10%는 25
    }
    analogWrite(PWM_out,PWM_data); // PWM_out에 PWM_data만큼의 아날로그 신호 출력
    //
    
    unsigned char Duty_rate=(PWM_data*100)/255;                // Duty rate 계산
    if((count<2)&&(Duty_rate>0)&&(Duty_rate<10))Duty_rate==10; // 1~10 사이면 10으로
    if(count<4)count++;
    //
    Serial.print("NTC Value: ");          Serial.print(Value,3);        Serial.print("[Ω]\t");
    Serial.print("Temperature: ");        Serial.print(Temp);           Serial.print("[℃]\t");
    Serial.print("Temp_Setting_Value: "); Serial.print(Temp_set_value); Serial.print("[℃]\t");
    Serial.print("Duty_rate: ");          Serial.print(Duty_rate);      Serial.println("[%]");
    delay(500);
    lcd.setCursor(0,0); lcd.print("Temp: ");      lcd.setCursor( 5,0); lcd.print(Temp);
    lcd.setCursor(0,1); lcd.print("Duty_rate: "); lcd.setCursor(10,1); lcd.print(Duty_rate); lcd.print("%");
}