#include <Servo.h>

int pinTrig = 11;
int pinEcho = 12; //ultrasound sensor on pin 1 (analogue)
int LED = 2;

int brightness = 0;
int proximity = 0;
int distance;
long int duration;

void setup() {
  // put your setup code here, to run once:
  Serial.begin (9600);
  
  pinMode(pinTrig, OUTPUT);
  pinMode(pinEcho, INPUT);
  pinMode(LED, OUTPUT);
  }

void loop() {
  // put your main code here, to run repeatedly:
  // The sensor is triggered by a HIGH pulse of 10 or more microseconds.
  // Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
  brightness = 0;
  digitalWrite(pinTrig, LOW);
  delay(100);
  digitalWrite(pinTrig, HIGH);
  analogWrite(LED, brightness);
  delay(1000);
  digitalWrite(pinTrig, LOW);
  duration = pulseIn(pinEcho, HIGH);
  distance = (duration/2)/29.1; //converts time to cm
  
  //proximity would be used to map brightness?
  Serial.print(distance);
  Serial.println("cm");
  delay(200);

  brightness = brightness + distance;
  analogWrite(LED, brightness);
  Serial.print("Brightness of LED is ");
  Serial.println(brightness);

}