#include <avr/io.h>
#include <util/delay.h>

void setup() {
  // Set PD2, PD3, and PD4 as output pins
  DDRD |= (1 << 2); 
  DDRD |= (1 << 3);
  DDRD |= (1 << 4); 
  
  // Set PD5, PD6, and PD7 as input pins
  DDRD &= ~(1 << 5);
  DDRD &= ~(1 << 6);
  DDRD &= ~(1 << 7);

  // ADC setup
  ADMUX = 0; // Select ADC0
  ADMUX &= ~(1 << MUX0); // Ensure it's using ADC0
  ADCSRA |= (1 << ADEN) | (1 << ADSC); // Enable ADC and start conversion

  // Initialize serial communication
  Serial.begin(9600);
}

void butanLesen(double *x) 
{
double butan=0;
  ADCSRA |= (1<<ADSC);
  butan = ADCL|ADCH<<8;
  _delay_ms(200);
  double y=(50/1023);
  *x=butan*1000/1023;
}


void Ampel(double x) {
  if (x >= 100 && x < 500) {
    // Green light on, others off
    PORTD &= ~(1 << 3); 
    PORTD &= ~(1 << 4);
    PORTD |= (1 << 2);  
    _delay_ms(600);
  }

  if (x >= 500 && x < 700) {
    // Yellow light on, others off
    PORTD &= ~(1 << 2); 
    PORTD &= ~(1 << 4);
    PORTD |= (1 << 3);
    _delay_ms(600);
  }

  if (x >= 900) {
    // Red light on, others off
    PORTD &= ~(1 << 2); 
    PORTD &= ~(1 << 3);
    PORTD |= (1 << 4);
    _delay_ms(600);
  }

  // Check if button on PD7 is pressed and x is 3 (reset condition)
  if (PIND & (1 << 7)) {
    // All lights off
    PORTD &= ~(1 << 2);  
    PORTD &= ~(1 << 3);  
    PORTD &= ~(1 << 4); 
    _delay_ms(600);
  }
}

int main() {
  

  // Initial setup
  setup();
  double x = 0;

  while (1) {
    // Read sensor value
    butanLesen(&x);

    Ampel(x);
  }

  return 0;
}