int sensorPin = 42;    // select the input pin for the potentiometer
int stepperPin = 23; // select the pin for the LED
int dirPin = 40; //  0 for CW 1 for CCW
int sensorValue = 0;  // variable to store the value coming from the sensor
int sensorValue2 =0; // variable for sensor2
int triggerPin = 39;
int ledPin = 16;
int sensorPin2 = 43;
int powerLight = 6;
int Enable = 41;


void setup() {
  // declare the ledPin as an OUTPUT:
  pinMode(stepperPin, OUTPUT);
  pinMode(dirPin, OUTPUT);
  pinMode(triggerPin, OUTPUT);
  pinMode(ledPin, OUTPUT);  
  Serial.begin(9600);
  pinMode(powerLight, OUTPUT);
  pinMode (Enable, OUTPUT);
  }

void powerlight(){
  digitalWrite(powerLight, HIGH);
  delay(500);
  digitalWrite(powerLight, LOW);
  delay(500);
}

void scanner(){
    
    
    for(int i=0;i<4;i++){
    digitalWrite(stepperPin, HIGH); //start motor, move 40um
    delay(2);
    digitalWrite(stepperPin, LOW);}
    
    analogWrite(ledPin, 15); //Open Shutter
    delay(5);
    digitalWrite(triggerPin, HIGH); //aquire spectrum
    delay(10);
    digitalWrite(triggerPin, LOW);
    delay(40);
    digitalWrite(triggerPin, HIGH); //aquire spectrum
    delay(10);
    digitalWrite(triggerPin, LOW);
    delay(40);
    digitalWrite(triggerPin, HIGH); //aquire spectrum
    delay(10);
    digitalWrite(triggerPin, LOW);
    delay(40);
    digitalWrite(triggerPin, HIGH); //aquire spectrum
    delay(10);
    digitalWrite(triggerPin, LOW);
    delay(40);
    digitalWrite(triggerPin, HIGH); //aquire spectrum
    delay(10);
    digitalWrite(triggerPin, LOW);
    delay(40);
    digitalWrite(ledPin, 0);
    delay(25);
  }
 


void reposition(){
  sensorValue2 = analogRead(sensorPin2); //using open builds nema23 and half step mode, this is 8mm or 20um/step
   Serial.print(sensorValue2);
  if (sensorValue2 >= 500){
       for(int i=0;i<400;i++){
       digitalWrite(stepperPin, HIGH);
       delay(2);
       digitalWrite(stepperPin, LOW);
     } 
  }
}
   

void loop() {
    powerlight();
    digitalWrite(dirPin, LOW); 
    sensorValue = analogRead(sensorPin);
    Serial.print(sensorValue);    
    if (sensorValue >= 500){
    for(int i=0;i<800;i++)
    scanner();
    }
    Serial.print("aaa");
    reposition();
 }