#include <Keypad.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);   

const uint8_t ROWS = 4;
const uint8_t COLS = 4;
char keys[ROWS][COLS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};

uint8_t colPins[COLS] = { 5, 4, 3, 2 }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = { 9, 8, 7, 6 }; // Pins connected to R1, R2, R3, R4

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);


String inputString = "";

const int ldr=A0;
const float GAMMA=0.7, RL10=50;

int parameterValue = 0;

void setup() {
  Serial.begin(9600);
    lcd.init();
  lcd.backlight();
  pinMode(A0, INPUT);

    const float GAMMA = 0.7;
  const float RL10 = 50;
  int analogValue = analogRead(ldr);
  float voltage = analogValue/1024*5;

}

void loop() {
  char key = keypad.getKey();

  if (key != NO_KEY) {
    Serial.println(key);


inputString += key;

if (inputString.length() > 2) {
      inputString = "";
      lcd.clear();
    
    }

   if (key == 'A') {
      // แปลงค่าที่ได้จาก key pad เป็นตัวเลขและกำหนดค่าให้กับ parameterValue
      parameterValue = inputString.toInt();

      // แสดงค่าที่ได้ใน Serial Monitor
      Serial.println("Setting parameterValue to: " + String(parameterValue));

      // รีเซ็ตตัวแปร inputString สำหรับการรับค่าใหม่
      inputString = "";
 
      lcd.print("LDR setting :" + String(parameterValue));
      lcd.print(" Lux");
      delay(500);
   }
   else if (key == 'B'){
    lcd.clear();
   }
// if (key = 'A'  ){
//   lcd.setCursor(0,0);
//     // lcd.print("LDR setting :");
//     // lcd.print("F A");
//     lcd.print("LDR setting :");
//     lcd.print(inputString);
//     lcd.print(" Lux");
// }
// else if (key = 'A'){
    
// }

    //   lcd.setCursor(0,0);

     delay(50);
  }
}