Object counter « counting box »

Hi,

I'm proud to announced that the project seems to work pretty good ! See picture attached.
I corrected some pieces of code (still not changed it with the boolean variables).

I have 1 mini-issue : when i start the arduino, the variable FC51 always goes to 1 by itself, so the counter starts at 1. When i press reset, it goes to 0 and everything becomes normal.
Do you know why the FC51 reacts like that ? Is there a workaround that it doesn't, or at least that the counter really starts at 0 and not 1 ? Maybe something to change in the code ?

Below the current code :

#include "LedControl.h"
LedControl lc = LedControl(4,5,6,4);

// ----- Code for Change State for FC-51
// this constant won't change:
const int  PinFC51 = 12;    // the pin that the pushbutton is attached to
const int  PinButtonPlus1 = 8;    // the pin that the pushbutton is attached to
const int  PinButtonMinus1 = 9;    // the pin that the pushbutton is attached to
const int  PinButtonReset = 10;    // the pin that the pushbutton is attached to
const int PinLED = 4;       // the pin that the LED is attached to

// Variables will change:
int buttonStateFC51 = 0;         // current state of the FC51
int lastButtonStateFC51 = 0;     // previous state of the FC51

int buttonStatePlus1 = 0;         // current state of the button
int lastButtonStatePlus1 = 0;     // previous state of the button

int buttonStateMinus1 = 0;         // current state of the button
int lastButtonStateMinus1 = 0;     // previous state of the button

int buttonStateReset = 0;         // current state of the button
int lastButtonStateReset = 0;     // previous state of the button


int FC51 = 0;
int ButtonPlus1 = 0;
int ButtonMinus1 = 0;
int ButtonReset = 0;


// ----- Code for Max7219 + LEDs
int count = 0;


void setup()
{

// ----- Code for Change State for FC-51
  // initialize the button pin as an input:
  pinMode(PinFC51, INPUT);
  pinMode(PinButtonPlus1, INPUT);
  pinMode(PinButtonMinus1, INPUT);
  pinMode(PinButtonReset, INPUT);
  
  // initialize the LED as an output:
  pinMode(PinLED, OUTPUT);
  
  // initialize serial communication:
  Serial.begin(9600);

// ----- Code for Max7219 + LEDs
    lc.shutdown(0,false); //to activate the led's
    lc.setIntensity(0,5); //to define the brightness of the led's
    lc.clearDisplay(0); //to cancel all info on the led's
    lc.setDigit(0,0,0,false); //to show 0 as initial number - hundreds
    lc.setChar(0,1,0,false); //to show 0 as initial number - tens
    lc.setChar(0,2,0,false); //to show 0 as initial number - units
    lc.setChar(0,3,0,false); //to show 0 as initial number - doesn't exist as 3-digit
}

void loop() {

// if FC51 changes the state, it does +1
ChangeStateFC51();
if (FC51 == 1) { 
  Plus1();
  Update7segment(count);
  Serial.print("FC51=");
  Serial.println(FC51);
  FC51=0;
  }

// if PushButtonPlus1 is active, it does +1
PushButtonPlus1();
if (ButtonPlus1 == 1) { 
  Plus1();
  Update7segment(count);
  Serial.print("ButtonPlus1=");
  Serial.println(ButtonPlus1);
  ButtonPlus1=0;
  }

// if PushButtonMinus1 is active, it does -1
PushButtonMinus1();
if (ButtonMinus1 == 1) { 
  Minus1();
  Update7segment(count);
  Serial.print("ButtonMinus1=");
  Serial.println(ButtonMinus1);
  ButtonMinus1=0;
  }

// if PushButtonReset is active, it resets to 0
PushButtonReset();
if (ButtonReset == 1) { 
  Reset();
  Update7segment(count);
  Serial.print("ButtonReset=");
  Serial.println(ButtonReset);
  ButtonReset=0; 
  }

}

void ChangeStateFC51() {

  // read the FC51 input pin:
  buttonStateFC51 = digitalRead(PinFC51);

  // compare the buttonState to its previous state
  if (buttonStateFC51 != lastButtonStateFC51) {
    // if the state has changed from low to high, increment the counter otherwise don't
    if (buttonStateFC51 == HIGH) {
      FC51=1;
    }
    // Delay a little bit to avoid bouncing
    delay(50);
  }
  // save the current state as the last state, for next time through the loop
  lastButtonStateFC51 = buttonStateFC51;

}

void PushButtonPlus1() {
  
  // read the pushbutton input pin:
  buttonStatePlus1 = digitalRead(PinButtonPlus1);

  // compare the buttonState to its previous state
  if (buttonStatePlus1 != lastButtonStatePlus1) {
    // if the state has changed from low to high, increment the counter otherwise don't
    if (buttonStatePlus1 == HIGH) {
      ButtonPlus1=1;
    }
    // Delay a little bit to avoid bouncing
    delay(50);
  }
  // save the current state as the last state, for next time through the loop
  lastButtonStatePlus1 = buttonStatePlus1;
  
}

void PushButtonMinus1() {
  
  // read the pushbutton input pin:
  buttonStateMinus1 = digitalRead(PinButtonMinus1);

  // compare the buttonState to its previous state
  if (buttonStateMinus1 != lastButtonStateMinus1) {
    // if the state has changed from low to high, increment the counter otherwise don't
    if (buttonStateMinus1 == HIGH) {
      ButtonMinus1=1;
    }
    // Delay a little bit to avoid bouncing
    delay(50);
  }
  // save the current state as the last state, for next time through the loop
  lastButtonStateMinus1 = buttonStateMinus1;
  
}

void PushButtonReset() {
  
  // read the pushbutton input pin:
  buttonStateReset = digitalRead(PinButtonReset);

  // compare the buttonState to its previous state
    if (buttonStateReset != lastButtonStateReset) {
    // if the state has changed from low to high, increment the counter otherwise don't
  if (buttonStateReset == HIGH) {
      ButtonReset=1;
    }
    // Delay a little bit to avoid bouncing
    delay(50);
    }
  // save the current state as the last state, for next time through the loop
  lastButtonStateReset = buttonStateReset;
  
}

void Plus1()
{
  if (count>=999) {
    count = 0;
  } else {
    count = count + 1;
  }
}

void Minus1()
{
  if (count<=0) {
    count = 0;
  } else {
    count = count - 1;
  }
}

void Reset()
{
  count = 0;
}

void Update7segment(int v) {  
    
    int ones;  
    int tens;  
    int hundreds; 

    //set the different numbers
    ones=v%10;  
    v=v/10; 
     
    tens=v%10;  
    v=v/10;
    
    hundreds=v;  

    //print the numbers digit by digit
    lc.setDigit(0,0,(byte)hundreds,false);
    lc.setDigit(0,1,(byte)tens,false); 
    lc.setDigit(0,2,(byte)ones,false);

  Serial.print("count : ");
  Serial.println(count);
  Serial.print("v : ");
  Serial.println(v);
  Serial.print("ByteHun : ");
  Serial.println((byte)hundreds);
  Serial.print("ByteTen : ");
  Serial.println((byte)tens);
  Serial.print("ByteOne : ");
  Serial.println((byte)ones);

}

I now need to build the real protoype, and see if 1 IR sensor works with the plastic bags, or if need to put more, or change to the piezoelectric one.

Thanks again for your help,