//global variables

//Analog pin 1 for reading in the analog voltage from the MaxSonar device.
//This variable is a constant because the pin will not change throughout execution of this code.
const int anPin = 1;

//variables needed to store values
long anVolt, inches;
int sum=0;//Create sum variable so it can be averaged
int avgrange=10;//Quantity of values to average (sample size)
int waitTime=1000;//time before calibration starts in miliseconds.
int maxDistanceInInch;
boolean isShooting=false;

//MaxSonar Analog reads are known to be very sensitive. See the Arduino forum for more information.
  //A simple fix is to average out a sample of n readings to get a more consistant reading.\\
  //Even with averaging I still find it to be less accurate than the pw method.\\

void setup() {
  //This opens up a serial connection to shoot the results back to the PC console
  Serial.begin(9600);

  delay(waitTime);

  pinMode(anPin, INPUT);

  //measure 10 times to calibrate
  for(int i = 0; i < 10 ; i++)
  {
    //Used to read in the analog voltage output that is being sent by the MaxSonar device.
    //Scale factor is (Vcc/512) per inch. A 5V supply yields ~9.8mV/in
    //Arduino analog pin goes from 0 to 1024, so the value has to be divided by 2 to get the actual inches
    anVolt = analogRead(anPin)/2;
    sum += anVolt;
    delay(10);
  }
  maxDistanceInInch = sum/10;

}
void loop() {


for(int i = 0; i < avgrange ; i++)
  {
    //Used to read in the analog voltage output that is being sent by the MaxSonar device.
    //Scale factor is (Vcc/512) per inch. A 5V supply yields ~9.8mV/in
    //Arduino analog pin goes from 0 to 1024, so the value has to be divided by 2 to get the actual inches
    anVolt = analogRead(anPin)/2;
    sum += anVolt;
    delay(10);
  }

  inches = sum/avgrange;

  if(inches <= maxDistanceInInch&& !isShooting)//if someone comes close and we aren't shooting already
  {
    startShooting();
  }
  else if(inches>maxDistanceInInch && isShooting)//if no one is close but we are shooting
  {
    stopShooting();
  }

  delay(500);
}

void startShooting()
{
  isShooting=true;
//TODO: Code to start shooting
}

void stopShooting()
{
//todo:Code to stop shooting

isShooting=false;
}