const int pedalPin = A2;          // Accelerator pedal pin (Analog input)
const int wheelPin = 3;           // Wheel speed sensor pin (Digital input)
const int enginePin = 8;          // PWM output pin for engine control
const float wheelSize = 0.45;     // Wheel diameter in meters
void setup() {
  pinMode(enginePin, OUTPUT);
  Serial.begin(9600);
}
void loop() {
  // Read accelerator pedal position
  int pedalPosition = readPedalPosition();
  // Calculate engine demand signal
  int engineDemand = calculateEngineDemand(pedalPosition);
  // Set engine speed using PWM output
  setEngineSpeed(engineDemand);
  // Read wheel speed and calculate vehicle speed
  float vehicleSpeed = calculateVehicleSpeed(wheelPin, wheelSize);
  // Output speed and engine demand to Serial monitor
  outputSpeedAndDemand(vehicleSpeed, engineDemand);
  // Delay for 500 milliseconds
  delay(500);  
}
int readPedalPosition() {
  int pedalValue = analogRead(pedalPin);
  return map(pedalValue, 0, 1023, 0, 100);
}
int calculateEngineDemand(int pedalPosition) {
  return map(pedalPosition, 0, 100, 0, 255);
}
void setEngineSpeed(int engineDemand) {
  analogWrite(enginePin, engineDemand);
}
float calculateVehicleSpeed(int sensorPin, float wheelDiameter) {
  unsigned long pulseDuration = pulseIn(sensorPin, HIGH);
  float wheelCircumference = wheelDiameter * PI;
  float wheelRevolutions = pulseDuration / 1000;  // Convert to seconds
  float vehicleSpeed = (wheelCircumference / wheelRevolutions) * 3.6;  // Convert to km/h
  return vehicleSpeed;
}
void outputSpeedAndDemand(float vehicleSpeed, int engineDemand) {
  Serial.print("Speed = ");
  Serial.print(vehicleSpeed, 2);
  Serial.print(" Km/H ");
  Serial.print("Demand = ");
  Serial.print(engineDemand);
  Serial.println(" %");
}