#define PIN_A0 A0 // Analog Input Pin
#define PIN_D8 8 // Digital Output Pin
#define PIN_D9 9 // Digital Output Pin
#define PIN_D10 10 // Digital Output Pin
unsigned long iterationCounter = 0;

void setup() {
    Serial.begin(9600); // Start serial communication for debugging
    // Setup all pins as input except D8 which needs to start as output
    pinMode(PIN_A0, INPUT);
    pinMode(PIN_D9, INPUT);
    pinMode(PIN_D10, INPUT);
    pinMode(PIN_D8, INPUT);
}

// Function to change state of pins
int changeState(int currentState){
    if(currentState == 2){
        return 0;
    }else{
        return currentState + 1;
    }
}

void loop(){
    
    
    static int d8state = 0, d9state = 1, d10state = 2; // States for digital pins
  
    // Change states for digital pins
    d8state = changeState(d8state);
    d9state = changeState(d9state);
    d10state = changeState(d10state);
      
    switch(d8state){
      case 0: digitalWrite(PIN_D8,HIGH); break;
      case 1: digitalWrite(PIN_D8,LOW); break;
      case 2: digitalWrite(PIN_D8,INPUT); break;
    }
        
    switch(d9state){
      case 0: digitalWrite(PIN_D9,HIGH); break;
      case 1: digitalWrite(PIN_D9,LOW); break;
      case 2: digitalWrite(PIN_D9,INPUT); break;
    }
          
    switch(d10state){
      case 0: digitalWrite(PIN_D10,HIGH); break;
      case 1: digitalWrite(PIN_D10,LOW); break;
      case 2: digitalWrite(PIN_D10,INPUT); break;
    }
    int adcValue = analogRead(PIN_A0); // Read from ADC 
    delay(100); // Delay between cycles
            
    // Printing values
    Serial.print("Iteration: ");
    Serial.print(iterationCounter++);
    Serial.print("\t ADC Value: ");
    Serial.print(adcValue);
    Serial.print("\t Pin D8 State: ");
    Serial.print(d8state);
    Serial.print("\t Pin D9 State: ");
    Serial.print(d9state);
    Serial.print("\t Pin D10 State: ");
    Serial.print(d10state);
    Serial.println();
}