/*
  PhotodiodeReadOut Arduino Script.
  
  Reads out channel 0-3 on an arduino and print out the time and result to the serial port.
  
  Ch 0 on -> time 0001
  Ch 1 on -> time 0010
  ...
  Ch 2,3 on -> time 1100
  etc...
  
  Created: 15 Mar 2013 by Wing H To, UCSB HEX Group
  Updated: 25 Apr 2013 by Wing H To, UCSB HEX Group
  
*/ 
#include <iostream>
#include <iomanip>

void setup() {
  Serial.begin(9600);
}

//int NIter=0;//global variable for testing only.
// the loop routine runs over and over again forever:
void loop() {
    
    //NIter++;// Loop counter.
    int t0,t1,t2,t3;
    // Read out each digital channel.
    bool d0 = digitalRead(0);
    t0 = millis();
    bool d1 = digitalRead(1);
    t1 = millis();
    bool d2 = digitalRead(2);
    t2 = millis();
    bool d3 = digitalRead(3);
    t3 = millis();
    //Serial.println(t0);
    //Serial.println(t1);
    //Serial.println(t2);
    //Serial.println(t3);
    
    unsigned int output = 0;
    
    if(d0) output+=1;
    if(d1) output+=2;
    if(d2) output+=4;
    if(d3) output+=8;
    
   // Output the result on the serial port.
   // Each print  takes ~ 5 ms.
   if(output > 0){
     //Serial.print(NIter);
     Serial.print(millis()/1000.);
     Serial.print(" ");
     if(output < 8) Serial.print(0);
     else delay(5);
     if(output < 4) Serial.print(0);
     else delay(5);
     if(output < 2) Serial.print(0);
     else delay(5);
     Serial.println(output,BIN);
   }
    output = 0;
    delay(100); // Don't go below 20 ms. 
}