Double Transducer: Proximity to Light to Angle
   Kaitlin McTigue, Nathan Naylor
   This code
   1. Mesures distance with an IR sensor
   2. Maps that distance to a scale of 0-5
   3. Lights an LED with brightness based on the IR value
   4. Uses a photoreceptor to measure the amount of light emitted by the LED
   5. Maps that light value to a number between 1 and 170
   6. Spins a servo to that angle
   The angle of the servo represents the closeness of an object to the IR sensor!
   1 IR proximity sensor
   1 photoreceptor
   1 potentiometer

   1 LED
   1 servometer
   Serial Monitor Feedback

#include <Servo.h>

const int LEDPIN = 3; //digital
const int PHOTOPIN = A1; //analog
const int IRPIN = A0; //analog
Servo outservo;

void setup() {
  outservo.attach(2);  // attaches the servo on pin 
  pinMode(IRPIN, INPUT);
  pinMode(LEDPIN, OUTPUT);
  Serial.begin(9600); // Open serial monitor at 9600

void loop() {
  int irVal = analogRead(IRPIN); //read distance
  int ledVal = map(100, 500, irVal, 0, 5); //convert IR input to a scale 0 to 5 volts 
  analogWrite(LEDPIN, ledVal); //brighten LED as IR distance is closer
  int photoVal = analogRead(PHOTOPIN); //red LED brightness
  int servoVal = map(400, 500, photoVal, 170, 0); //convert photoreceptor input to a scale of 170 to 0
  outservo.write(servoVal); //move servo between 0 and 170 degrees