#include "SoftwareSerial.h"
const int Rx = 1; // this is physical pin 2

const int Tx = 2; // this is physical pin 3


const long A = 1000;     //Resistencia en oscuridad en KΩ
const int B = 15;        //Resistencia a la luz (10 Lux) en KΩ
const int Rc = 10;       //Resistencia calibracion en KΩ
const int LDRPin = A7;   //Pin del LDR 6 ATTiny
 
int V;
int ilum;
int cont = 0;

SoftwareSerial mySerial(Rx, Tx);

void setup(){ 
  pinMode(Rx, INPUT);
  pinMode(Tx, OUTPUT);
  mySerial.begin(9600); // send serial data at 9600 bits/sec 
}

void loop()
{
   V = analogRead(LDRPin);         
 
   //ilum = ((long)(1024-V)*A*10)/((long)B*Rc*V);  //usar si LDR entre GND y A0 
   ilum = ((long)V*A*10)/((long)B*Rc*(1024-V));    //usar si LDR entre A0 y Vcc (como en el esquema anterior)
  
   mySerial.println(ilum);
   mySerial.println(cont);   
   delay(1000);
   cont++;
}