// Define the analog input pin
const int analogInputPin = A0;

// Declare the global variable to store the AFR value
float AFR;

void setup() {
  // Initialize the serial communication
  Serial.begin(9600);
}

void loop() {
  // Read the analog input value (0-1023)
  int analogValue = analogRead(analogInputPin);
  
  // Convert the analog value to a voltage (0-5V)
  float voltage = analogValue * (5.0 / 1023.0);
  
  // Calculate the AFR value
  AFR = 2 * voltage + 9.6;
  
  // Output the AFR value to the serial monitor with one decimal place
  Serial.print("AFR: ");
  Serial.println(AFR, 1);
  
  // Add a small delay to avoid spamming the serial monitor
  delay(500);
}