void setup ()                     // This command sets up the Arduino software
{                                 // This bracket marks the start of set up
  pinMode (13, OUTPUT);           // Initializes Arduino pin 13 as an output and happens to be the same as the Arduino board's onboard LED 
  pinMode (A0, INPUT);            // Initializes analog pin "A0" as an input for the sensor module 
}                                 // This bracket marks the end of set up

void loop ()                      // Runs the Arduino software in a never ending loop
{                                 // This bracket marks the start of the loop
  if (digitalRead (A0) == LOW)    // If a pinball is detected, do one of the following two things
  {                               // This bracket marks the start of the "if"  statement - The first thing
    digitalWrite (13, HIGH);      // If a pinball is detected, turn the onboard LED ON
  }                               // This bracket marks the end of the "if"  statement
  else                            // If a pinball is not detected, keep the onboard LED OFF
  {                               // This bracket marks the start of the "else" statement - The second thing
    digitalWrite (13, LOW);       // This command keeps the onboard LED off
  }                               // This bracket marks the end of the "else" statement   
}                                 // This bracket marks the end of the loop