servo.ino

#include <Servo.h>
#include <NewPing.h>

#define TRIGGER_PIN  12  // Arduino pin tied to trigger pin on the ultrasonic sensor.
#define ECHO_PIN     11  // Arduino pin tied to echo pin on the ultrasonic sensor.
#define MAX_DISTANCE 200// Maximum distance we want to ping for (in centimeters). Maximum sensor distance is rated at 400-500cm.

NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE); // NewPing setup of pins and maximum distance.

Servo myservo;  // create servo object to control a servo

int potpin = 0;  // analog pin used to connect the potentiometer
int val;    // variable to read the value from the analog pin

int Pinled=2;

void setup() {
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
  pinMode(Pinled, OUTPUT);
}

void loop (){
  if (sonar.ping_cm() <= 20)
  {
    val=180;
    myservo.write(val);
    digitalWrite(Pinled, HIGH);
    
  }
  else {
    val=0;
    myservo.write(val);
    digitalWrite(Pinled, LOW);
    }
}