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[on:]

Hello there everyone! I'm actually new here and I'm hoping I could get some help from experts out there. So, here's our school project details:

Components:
1 - Arduino ATMEGA2560 Board
1 - Biometric Fingerprint Scanner - FPS (to be connected to Serial1 of Arduino ATMEGA2560)
2 - Passive RFID readers (to be connected to  Serial2 and Serial3 of Arduino ATMEGA2560)
x - Switches

There would be three modes of operation:
1. Adding of New Users
2. Deleting of Currently Enrolled Users
3. Reading the State of Currently Enrolled Users, whether they have previously logged in or logged out of the system

Our problem:

ADDING OF NEW USERS
1st readRFID() - gets the RFID card data
2nd getEmptyID() - gets an available location within the biometric fingerprint scanner where biometric data would be saved
3rd enroll_data() - scans the fingerprint and saves it on the location taken from the getEmptyID() function

When I try to put the getEmptyID() and enroll_data() function in the loop structure, there is actually no output.
However, if only one function is present in the loop structure, we can see an output from the Serial Monitor, which is either printing an available location or asking the user to enroll his/her fingerprint data.

**Code attached. I removed some parts of the code.

[Reply #1 on:]

There is something wrong with your rar. You should attack your code like others do it, using #-button, and paste your  code in it.

Cheers,
kari

[Reply #2 on:]

Sorry. I didn't notice that. I tried pasting it here but it extends the maximum length of characters per post so I attached it.

[Reply #3 on:]

#include <LiquidCrystal.h> //Import library for LCD
#include <EEPROM.h> //Import library for EEPROM
LiquidCrystal lcd(12, 11, 5, 4, 3, 2); //Initialize pins to be used for LCD

//VARIABLES FOR FINGERPRINT
int cks=0;
byte test [] = {0x55,0xAA,0x50,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
byte enroll [] = {0x55,0xAA,0x03,0x01,0x02,0x00,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
byte identify [] = {0x55,0xAA,0x02,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
byte clearalltemplate [] = {0x55,0xAA,0x06,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
byte cleartemplate [] = {0x55,0xAA,0x05,0x01,0x02,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
byte getemptytemp [] = {0x55,0xAA,0x07,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
byte cancelop[]=  {0x55,0xAA,0x30,0x01,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
byte standby[]=  {0x55,0xAA,0x17,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
byte temp_no=0x01;
byte r_data[24];
byte prev;

byte cmd[24];

//VARIABLES FOR RFID
int i = 0;
int curAdd=0;
byte val = 0;
byte code[6];
byte checksum = 0;
byte bytesread = 0;
byte tempbyte = 0;

byte mode = 1;

void setup(){
    Serial.begin(9600); //For Serial Monitor
    Serial1.begin(115200); //For Biometric Fingerprint Scanner
    Serial2.begin(9600); // For RFID Reader 1
    Serial3.begin(9600); //For RFID Reader 2
}
void loop(){
  sendGetEmptyID();
  sendEnroll();
}

void sendTest()
{
    for (int i = 0; i<7;i++)
    {
      cks = cks + test;
    }
   
    test[22] = cks&0xFF;
    test[23] = (cks - test[22])/256;
   
    for (int i = 0; i<24; i++)
    {
      Serial1.write(test);
      //Serial.print(test);
    }
    cks=0;
}

void sendEnroll()
{
   enroll[6]=temp_no;
   send_command:
   for (int i = 0; i<7; i++)
   {
     cks = cks + enroll;
   }
 
   enroll[22]=cks&0xFF;
   enroll[23]=(cks - enroll[22])/256;
 
   for (int i = 0; i<24; i++)
   {
     Serial1.write(enroll);
   }
   cks=0;
}

void sendIdentify()
{
     for (int i = 0; i<7; i++)
     {
       cks = cks + identify;
     }

      identify[22]=cks&0xFF;
      identify[23]=(cks - identify[22])/256;
   
      for (int j = 0; j<24; j++)
      {
        Serial1.write(identify[j]);
      }
      cks=0;
     
}
void sendCancel()
{
  for (int i = 0; i<7;i++)
  {
    cks = cks + cancelop;
  }
 
  cancelop[22] = cks&0xFF;
  cancelop[23] = (cks - cancelop[22])/256;
 
  for (int i = 0; i<24; i++)
  {
    Serial1.write(cancelop);
  }
  cks=0;
}

void sendClearAll()
{
  for (int i = 0; i<7;i++)
  {
    cks = cks + clearalltemplate;
  }
 
  clearalltemplate[22] = cks&0xFF;
  clearalltemplate[23] = (cks - clearalltemplate[22])/256;
   
  for (int i = 0; i<24; i++)
    {
      Serial1.write(clearalltemplate);
    }
    cks=0;
}

void sendClearOne()
{
  for (int i = 0; i<7;i++)
  {
    cks = cks + cleartemplate;
  }
 
  cleartemplate[22] = cks&0xFF;
  cleartemplate[23] = (cks - cleartemplate[22])/256;
   
  for (int i = 0; i<24; i++)
    {
      Serial1.write(cleartemplate);
    }
    cks=0;
}

void sendGetEmptyID()
{ 
  for (int i = 0; i<7;i++)
  {
    cks = cks + getemptytemp;
  }
 
  getemptytemp[22] = cks&0xFF;
  getemptytemp[23] = (cks - getemptytemp[22])/256;
 
  for (int i = 0; i<24; i++)
  {
    Serial1.write(getemptytemp);
  }
  cks=0;
}

void sendStandbyMode()
{
  for (int i = 0; i<7;i++)
  {
    cks = cks + standby;
  }
 
  standby[22] = cks&0xFF;
  standby[23] = (cks - standby[22])/256;
 
  for (int i = 0; i<24; i++)
  {
    Serial1.write(standby);
  }
  cks=0;
}

void serialEvent1(){
  for(int ctr=0;ctr<24;ctr++)
  {
    r_data[ctr]=Serial1.read();
    Serial.print(r_data[ctr],HEX);
  }
  Serial.println("");
  processFPS();
}

void processFPS(){
  switch(r_data[2])
  {
    case 2:      //identify
     if(r_data[8]==0xF4)
     {
       for (int k = 0;k<24;k++)
       {
         r_data[k] = Serial1.read();
       }
       
       if(r_data[8]==0x12||r_data[8]==0xFF)
       {
         Serial.print("Fingerprint doesn't exist on database.");
        }
       else
       {
         Serial.print("Identify successful. Template number is ");
         Serial.println(r_data[8],HEX);
        }
     }
    break;
    case 3:      //enroll
    readAgain:
    if (r_data[6]==0x00)
    {
      if (r_data[8]==0xF1)
         {
           Serial.println("First pass:");
                   for(int i = 0; i<24; i++)
                      {
                       r_data = Serial1.read();
                       //Serial.print(r_data);
                      }
                      goto readAgain;
                   
         }     
       else if (r_data[8]==0xF2)
         {
           Serial.println("Second pass:");
           for(int i = 0; i<24; i++)
           {
             r_data = Serial1.read();
             //Serial.print(r_data);
            }
            goto readAgain;       
         }
         else if (r_data[8]==0xF3)
         {
           Serial.println("Third pass:");
           for(int i = 0; i<24; i++)
           {
             r_data = Serial1.read();
             //Serial.print(r_data);
           }
           goto readAgain;
         }
         else if (r_data[8]==0xF4)
         {
             Serial.println("Sweep successful! Please lift finger");
             for(int i = 0; i<24; i++)
             {
               r_data = Serial1.read();
               //Serial.print(r_data);
             }
             goto readAgain;
         }
    }
    else if(r_data[6]==0x01)
    {
      if(r_data[8]==0x23)
      {
            Serial.println("Time out. No fingerprint detected!");
            for(int i = 0; i<24; i++)
            {
              r_data = Serial1.read();
              //  Serial.print(r_data);
            }
            goto readAgain;
       }
      else if(r_data[8]==0x21)
      {
            Serial.println("Bad quality taken. Please try again");
            for(int i = 0; i<24; i++)
            {
              r_data = Serial1.read();
              //Serial.print(r_data);
            }
            goto readAgain;
       }
      else if(r_data[8]==0x60)
      {
        Serial.println("Template number is invalid");
      }
      else if(r_data[8]==0x14)
      {
        Serial.println("Data exists for template number");
      }
      else if(r_data[8]==0x30)
      {
        Serial.println("Generalizing template number fail");
        sendEnroll();
      }
      else if(r_data[8]==0x19)
      {
        Serial.println("Fingerprint has been enrolled already!");
      }
    }
    break;   
    case 5:      //clear template
    break;
    case 6:      //clear all template
    if(r_data[22]=0x0A&&r_data[23]==0x01) Serial.println("Clear all template successful");
    break;
    case 7:      //get empty ID
readID: 
    for (int k = 0;k<24;k++)
    {
      r_data[k] = Serial1.read();
    }
 
    if (r_data[6]==0x00)
    {
      if(r_data[8]==0x00||r_data[8]==0xFF||r_data[8]>0x60)
      {
        goto readID;
      }
      else
      {
        temp_no=r_data[8];
        Serial.print(temp_no,HEX);
      }
    }
    break;
    case 17:    //enter standby mode
    break;
    case 30:    //cancel current operation
    break;
    case 50:    //test connection
    if(r_data[22]=0x54&&r_data[23]==0x01) Serial.println("Connection to FPS successful");
    break;
  }
}

[Reply #4 on:]

Above is the revised program. Hope you could help. 

[Reply #5 on:]

...using #-button, and paste your  code in it...

Try again...

Cheers,
Kari