/*
  Analog Input to LED and to Serial

  Demonstrates analog input by reading an analog sensor (PHOTOTRANSISTOR) on analog pin 0, 
  sending its value over Software Serial and
  turning on and off a light emitting diode(LED) connected to digital pin 7.
  The amount of time the LED will be on and off depends on the value obtained
  by analogRead().
  This code is optimised for usage with the ATTiny44A

  created by David Cuartielles
  modified 30 Aug 2011
  By Tom Igoe
  modified 12 Mar 2019
  by Joey van der Bie

  This example code is in the public domain.

  http://www.arduino.cc/en/Tutorial/AnalogInput
*/
#include <SoftwareSerial.h>
#define RX    1   
#define TX    0   

const int PHOTOTRANSISTOR_PIN = A2;    // select the input pin for the PHOTOTRANSISTOR
const int LED_PIN = 7;     // select the pin for the LED
int sensorValue = 0;  // variable to store the value coming from the sensor

SoftwareSerial Serial(RX, TX);

void setup() {
  //Start serial 
  Serial.begin(9600);
  Serial.println("Initializing...");

  // declare the LED pin as an OUTPUT:
  pinMode(LED_PIN, OUTPUT);
  // declare the PHOTOTRANSISTOR pin as an INPUT
  pinMode(PHOTOTRANSISTOR_PIN, INPUT);
}

void loop() {
  // read the value from the sensor:
  sensorValue = analogRead(PHOTOTRANSISTOR_PIN);
  
  // map the value to a broader range to compensate for small difference in the PHOTOTRANSISTOR
//  sensorValue = map(sensorValue, 900, 1023, 0, 1023);

  //Send the value over the Serial line to the computer
  Serial.println(sensorValue);
  
  // turn the ledPin on
  digitalWrite(LED_PIN, HIGH);
  // stop the program for <sensorValue> milliseconds:
  delay(sensorValue);
  // turn the ledPin off:
  digitalWrite(LED_PIN, LOW);
  // stop the program for for <sensorValue> milliseconds:
  delay(sensorValue);
}