/*Problem 2 : Design an Adaptive Cruise Control (ACC) system that maintains
 a safe distance from the car in front while also providing basic 
 lane-keeping assistance. This project requires dynamic speed adjustments
based on the distance to other vehicles and simple lateral movement detection.

Ultrasonic/LIDAR Sensor: Measure the distance to the car in front.
Infrared or Camera Module (simulated): Detect Lane markings.
PWM Motor Control: Adjust throttle for speed control.
Servo Motor or LED: Provide simple steering adjustments for lane-keeping.

*/
#define PIN_TRIG 3
#define PIN_ECHO 2
#define ir 13
#define led 7
int ir_value=0;
void setup()
{
  Serial.begin(9600);
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);
  pinMode(led, OUTPUT);
  pinMode(ir, INPUT);
}

void loop() 
{
  digitalWrite(PIN_TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG, LOW);
  int duration = pulseIn(PIN_ECHO, HIGH);
  int distance=duration/58;
  ir_value=digitalRead(ir);
  if(ir_value==HIGH)
  {
    digitalWrite(led, HIGH); 
    Serial.println("Adjust throttle to drive on a lane"); 
  }
  if(ir_value==LOW)
  {
    digitalWrite(led, LOW); 
    Serial.println("Vehicle on the lane");
    
  }
  
  delay(1000);

}