/* 
Show the voltage across potentiometer using 4 digit 7SD.
*/
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  lcd.init();
  lcd.backlight();
  Serial.begin(9600);
  analogReference(INTERNAL);
}

void loop() {
  int x = analogRead(A0);
  float T = 100*(1.1 / 1023.0) * x;
  Serial.println(T);
  lcd.setCursor(6, 0);

  lcd.print(T);
   lcd.write(0xdf);
  lcd.print("C");
}


// #define vREF 5  // 1.1 if INTERNAL
// byte lupTable[] = 
// {
// 0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07,
// 0x7F, 0x6F, 0x77, 0x7C, 0x39, 0x5E, 0x79, 0x71	 
// };
// void setup() {
//   DDRD = 0b11000000;
//   DDRB = 0b00111111;
//   DDRC = 0b001111;
//   Serial.begin(9600);
//   analogReference(DEFAULT);
//   // INTERNAL in case of LM35
  
// }

// void loop() {
  
//   float myVoltage = analogRead(A5)*(vREF/1023.0); 
//   // Compute temperature while using LM35.
//   // float myTemperature = 100*myVoltage; then use myTemperature instead of myVoltage for 7SDs.
//   Serial.println(myVoltage,3);
//   unsigned long presentMillis = millis();
  
//   while(millis()-presentMillis<1000)
//   {
//     int convertedFor7SD = myVoltage*100;
//     for(int i = 0; i<=3; i++)
//     {
//       byte digit = convertedFor7SD%10;
//       byte y = lupTable[digit];
//       if (i==2)
//         y = y | 0b10000000;          // to turn on decimal point
//       PORTB = y;
//       digitalWrite(6,bitRead(y,6));
//       digitalWrite(7,bitRead(y,7));
//       PORTC = 0b001111;              // PORTC = DDRC; this command is also correct in this case.
//       bitClear(PORTC,i);
//       Serial.println(y,HEX);
//       /* Use delay(10) for hardware*/
//       delay(1000);                   // delay should be around 10-20 ms. But this simulator can't simulate that fast.
//       convertedFor7SD = convertedFor7SD/10;
//     }
//   }
// }