Appendix B: Arduino Code for “Can You Dodge a Laser?”
Copy everything below this line.

const int ready_light = 2;
const int fire_light = 3;
const int lazzor = 4;
const int fire_switch = 7;
const int sensor_in=0;
int seed_timer = 0;
long sensor_val = 0;


void setup(){
  pinMode(fire_switch,INPUT);
  pinMode(ready_light,OUTPUT);  
  pinMode(fire_light,OUTPUT);
  pinMode(lazzor,OUTPUT);
  Serial.begin(9600);
}

void loop (){
 //check_alignment();
  //read_sensor();
fire_the_lazzor();
}

long read_sensor(){
  int base_line = 0;
  int trip_point = 3 * base_line;
  sensor_val = analogRead(sensor_in);
  if (sensor_val > 500){
    digitalWrite(ready_light,HIGH);
    return sensor_val;
  }
  else{
    
    digitalWrite(ready_light,LOW);
    return 0;
  }
  
}

void check_alignment (){
  int count =0;
  long sensor_read = 0;
  for (int i=0; i < 4; i++){
    digitalWrite(ready_light, HIGH);
    delay(250);
    digitalWrite(ready_light,LOW);
    delay(250);
  }
  Serial.println("Calibrating Laser Please wait");
  digitalWrite (lazzor,HIGH);
  while (count < 10){
    sensor_read = read_sensor();
   Serial.println("Adjust Lazzor until Ready Light turns on"); 
    if(sensor_read > 300){
      Serial.print("Sensor Reading ");
      Serial.println(sensor_read);
      count++;
      delay(100);
    }
    else{
      count=0;
    }
  }
  Serial.println("Lazzor is aligned ... commence firing");
  //return 1;
}
    
  

void fire_the_lazzor(){
  long random_seed=0;
  long delay_time=0;
  static unsigned long startTime = 0;
  static unsigned long reactionTime = 0;
  digitalWrite(fire_light,LOW);
   digitalWrite(lazzor,LOW);
  Serial.println("Press The Fire Button");
  Serial.println("When the Red Light goes on the lazzor will fire ....");
  random_seed=switchTime();
  if (random_seed > 0){    
    delay_time = random(random_seed);
    delay(delay_time);
    digitalWrite(fire_light,HIGH);
    digitalWrite(lazzor,HIGH);
    //delay(500);
    sensor_val = analogRead(sensor_in);
  }
  while(sensor_val < 500){
    digitalWrite(lazzor,HIGH);
  }
  reactionTime = millis()-startTime;
  Serial.print("Reactioj Time is ...");
  Serial.println(reactionTime);
  Serial.println("Hmmm took longer than I expected ... looks like you got burned");   
}