#include <SoftwareSerial.h>
// ***
// *** Define the RX and TX pins. Choose any two
// *** pins that are unused. Try to avoid D0 (pin 5)
// *** and D2 (pin 7) if you plan to use I2C.
// ***
#define RX    1   // *** D3, Pin 2
#define TX    2   // *** D4, Pin 3

// ***
// *** Define the software based serial port. Using the
// *** name Serial so that code can be used on other
// *** platforms that support hardware based serial. On
// *** chips that support the hardware serial, just
// *** comment this line.
// ***
SoftwareSerial Serial(RX, TX);
const int analogPin = 3;    // pin that the sensor is attached to
const int laser = 4;       // pin that the LED is attached to
//const int threshold = 600;   // an arbitrary threshold level that's in the range of the analog input

void setup() {
  // initialize the LED pin as an output:
  pinMode(laser, OUTPUT);
  // initialize serial communications:
  Serial.begin(9600);
}

void loop() {
  // read the value of the potentiometer:
  int analogValue = analogRead(analogPin);
  digitalWrite(laser, HIGH);
  // if the analog value is high enough, turn on the LED:
 // if (analogValue > threshold) {
   // digitalWrite(ledPin, HIGH);
  //} else {
   // digitalWrite(ledPin, LOW);
 // }

  // print the analog value:
  Serial.println(analogValue);
  delay(1);             // delay in between reads for stability
}