const float BETA = 3950; // should match the Beta Coefficient of the thermistor

void init_ADC(void);
unsigned char start_ADC(void);
uint16_t read_ADC(void);
void Temp(uint16_t value); // Function declaration

void setup() {
  Serial.begin(9600);
  init_ADC();
  start_ADC();
  uint16_t x = read_ADC();
  float y;
  while (1) {
    Temp(x); // Pass x to Temp function
    delay(1000); // Delay for 1 second
  }
}

void init_ADC() {
  volatile char *admux = (volatile char *)0x7C;
  volatile char *adcsra = (volatile char *)0x7A;
  *admux = 0x40; // Internal 1.1V voltage reference with external capacitor at AREF pin
  sei();         // Enable global interrupt;
  *adcsra = 0xA7; // 11010111 128  factor and adc enable adc start
}

unsigned char start_ADC() {
  volatile char *adcsra = (volatile char *)0x7A;
  *adcsra = *adcsra | 0x40; // Starting the ADC
}

uint16_t read_ADC() {
 // volatile char *adcsra = (volatile char *)0x7A;
  volatile unsigned char *L = (volatile unsigned char *)0x78;
  volatile unsigned char *H = (volatile unsigned char *)0x79;
  uint16_t value;
  //while ((*adcsra & 0x10) == 0); // Wait for conversion to be completed
  value = (*H << 8) | *L;  // Combine the upper and lower bits to get 10-bit result
 // *adcsra = *adcsra | 0x10; // Clear the flag
  return value;
}

void Temp(uint16_t value) {
  float analogValue = float(value); // Convert to float
  float celsius = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
  Serial.println(celsius); // Print temperature
}

ISR(ADC_vect) {
  // ADC conversion complete interrupt handler
  ADCSRA |= (1 << 4); // Clear interrupt flag
}


void loop() {
  // Your main loop code here
}