// This sketch use a DMX shield with DmxSimple librairie
// A photoelectric sensor used to count people : ...
// A digital display to graph people count : Serial-7-Seg from Sparkfun
// maurin.box@gmail.com
// DmxSimple is available from: http://code.google.com/p/tinkerit
// Help and support: http://groups.google.com/group/dmxsimple
// TIMER2 id used by DMXSimple
#include <Stdio.h>
#include <DmxSimple.h>
#define sensPin        9         // people sensor input pin
int sensVal = 0;                 // sensor value
#define sensSwitchPin        4   // switch sensor input pin
int sensSwitchVal = 0;           // sensor value
long Time = 0;                     // time
int debounceTime = 10;            // debounce time
int peopleCount = 0;              // people count
int maxPeopleCount = 5000;        // set maximum count
boolean peopleCountState = true;
boolean DEBUG = false;
void setup(){
  pinMode(sensPin, INPUT);                // set pin as INPUT
  digitalWrite(sensPin, HIGH);            // turn on pullup resistor
  pinMode(sensSwitchPin, INPUT);          // set pin as INPUT
  digitalWrite(sensSwitchPin, HIGH);      // turn on pullup resistor
  /* The most common pin for DMX output is pin 3, which DmxSimple
   ** uses by default. If you need to change that, do it here. */
  DmxSimple.usePin(11); // TIMER2 is pin 3 & 11
  /* DMX devices typically need to receive a complete set of channels
   ** even if you only need to adjust the first channel. You can
   ** easily change the number of channels sent here. If you don't
   ** do this, DmxSimple will set the maximum channel number to the
   ** highest channel you DmxSimple.write() to. */
  // DmxSimple.maxChannel(4);
  Serial.begin(9600);
  if(!DEBUG)displayInit();
  DmxSimple.write(1, 0); // DMX cannon OFF
  DmxSimple.write(2, 0); // DMX light OFF
}
void loop(){
  sensSwitchVal = digitalRead(sensSwitchPin);   // get switch value 
  sensVal = digitalRead(sensPin);               // get sensor value  
  if( (change(&sensVal) == true) && (sensVal==LOW) && (Time>=debounceTime) && (peopleCountState==true) ){
    Time = 0;                                   // init debounceTime
    peopleCount++;
    if(!DEBUG) digit_print(peopleCount);        // print people count on DIGIT screen
    if(DEBUG) Serial.println(peopleCount);      // print people count on serial
    delay(10);
  }
  if( (change(&sensSwitchVal) == true) && (sensSwitchVal==LOW) && (peopleCountState==true) ){
    peopleCount = 4980;                         // Set people count to 4980
    if(!DEBUG) digit_print(peopleCount);        // print people count on DIGIT screen
    if(DEBUG) Serial.println(peopleCount);      // print people count on serial
    delay(10);
  }
  if( (peopleCount >= maxPeopleCount) && (peopleCountState == true) ){
    Time = 0;                                   // init debounceTime   
    DmxSimple.write(1, 255);                    // DMX cannon ON
    DmxSimple.write(2, 255);                    // DMX light ON
    delay(10);
    peopleCountState = false;
  }
  Time++;                                       // inc debounce Time
  delay(5); 
}
///////////////////////////////////////////////////////////////////
///////////// if input values change output is true
int change(int *val){  // *pointeur
  static int lastVal = 0;
  if(*val != lastVal){
    lastVal = *val;
    delay(10);
    return true;
  }
  else{
    return false;
  }
}
//////////// SetupDisplay
void displayInit(){
  Serial.print(0x76, BYTE);    // reset display
  Serial.print(0x7A, BYTE);    // brightness register
  Serial.print(0xC8, BYTE);    // set brightness to 200 (0 - 255)
  Serial.print(0x77, BYTE);    // adress o decimal points register
  Serial.print(0x00, BYTE);    // turn all decimal points OFF
  // make start-up signal
  for(int i=0; i<20; i++){
    Serial.print(random(200), BYTE);
    delay(20);
    Serial.print(random(200), BYTE);
    delay(20);
    Serial.print(random(200), BYTE);
    delay(20);
  }
  Serial.print(0x76, BYTE);    // reset display
  delay(20);
}
void digit_print(int myValue){
  int digPos = numdigits(myValue);
  for(int i=4; i>digPos; --i){
    if(!DEBUG)Serial.print(0x78, BYTE);    // display a blank digit 120
    delay(10);
  }
  if(!DEBUG)Serial.print(myValue, DEC);
  delay(10);
}
int numdigits(int i){
  char str[20];
  sprintf(str, "%d", abs(i));
  return(strlen(str));
}