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shahidpk

@kowshik1729 a simple npn transistor such as BC547 is enough for this.No need of MOSFET. EM-18 module draws 50mA current. I already tried it. But, No luck. I think, any changes are needed in my code.

shahidpk

@salmanfaris i have tried in all my ways... when power on in the absence of card. Shows no card. And led connected to indicate it is low(set by program on arduino pin 3). When card is placed it reads card and led light up. BUT it stay on always till power off. And once the card is placed. Then there is any change if card is removed. I noticed that by placing an led on tx pin of module, there is always a high signal from module. And when card is placing a small blink is seen. I think data stream.

shahidpk

@kowshik1729 i am working on it. When vcc is reconnecting the module re-reads the card. It take about 1 seconds maximum to read it.

shahidpk

@manthan555 Thanks

shahidpk

i brought an ATmega328P MCU with arduino bootloader.And programmed it few times. Worked without any error. But, once i tried to upload a program to it, it won't upload. and i checked the blinking of 13 rd pin won't blinking when reset. So, i thought bootloader is missing and tried to upload bootloader. But get some error. Help please. Error message given below

Arduino: 1.8.12 (Linux), Board: "Arduino Uno"

/snap/arduino/7/hardware/tools/avr/bin/avrdude -C/snap/arduino/7/hardware/tools/avr/etc/avrdude.conf -v -patmega328p -cstk500v1 -P/dev/ttyACM0 -b19200 -e -Ulock:w:0x3F:m -Uefuse:w:0xFD:m -Uhfuse:w:0xDE:m -Ulfuse:w:0xFF:m 

avrdude: Version 6.3-20190619
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2014 Joerg Wunsch

         System wide configuration file is "/snap/arduino/7/hardware/tools/avr/etc/avrdude.conf"
         User configuration file is "/home/shahid/snap/arduino/7/.avrduderc"
         User configuration file does not exist or is not a regular file, skipping

         Using Port                    : /dev/ttyACM0
         Using Programmer              : stk500v1
         Overriding Baud Rate          : 19200
         AVR Part                      : ATmega328P
         Chip Erase delay              : 9000 us
         PAGEL                         : PD7
         BS2                           : PC2
         RESET disposition             : dedicated
         RETRY pulse                   : SCK
         serial program mode           : yes
         parallel program mode         : yes
         Timeout                       : 200
         StabDelay                     : 100
         CmdexeDelay                   : 25
         SyncLoops                     : 32
         ByteDelay                     : 0
         PollIndex                     : 3
         PollValue                     : 0x53
         Memory Detail                 :

                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           eeprom        65    20     4    0 no       1024    4      0  3600  3600 0xff 0xff
           flash         65     6   128    0 yes     32768  128    256  4500  4500 0xff 0xff
           lfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           hfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           efuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           lock           0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           calibration    0     0     0    0 no          1    0      0     0     0 0x00 0x00
           signature      0     0     0    0 no          3    0      0     0     0 0x00 0x00

         Programmer Type : STK500
         Description     : Atmel STK500 Version 1.x firmware
         Hardware Version: 2
         Firmware Version: 1.18
         Topcard         : Unknown
         Vtarget         : 0.0 V
         Varef           : 0.0 V
         Oscillator      : Off
         SCK period      : 0.1 us

avrdude: AVR device initialized and ready to accept instructions

Reading | Error while burning bootloader.
################################################## | 100% 0.02s

avrdude: Device signature = 0x00ff00
avrdude: Expected signature for ATmega328P is 1E 95 0F
         Double check chip, or use -F to override this check.

avrdude done.  Thank you.

when i connect an external supply during bootloader burning the device signature shows as 0x00ff00. and when i connect power to ic from arduino uno 5v pin the device signature is 0x000000

shahidpk

@kowshik1729 yup. I had seen it somewhere

shahidpk

@salmanfaris ok, lemme try

shahidpk

i am working with arduino and EM-18 Reader module. i have a code for reading different cards. But,it reads the card once and return the card data. i want to read the same card continuously or periodically using that module to detect the presence of the card on the reader module to do a specific task. simply, i want to get a high signal on a pin as long as there is a right a right card in the reader range .and the signal should be low if the card is away from the range of the reader.
i have a code to read a card. for the operation that i mentioned above, what changes should i make in that code . or please provide a proper code. please Help !!!!!

char input[12];                        
int Number;

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

void loop() {                         
  if(Serial.available())             
  {
    int count = 0;
    while(Serial.available() && count < 12)
    {
      input[count] = Serial.read();
      count++;
      delay(5);
    }
    if(input[0] == '6' && input[1] == 'D' && input[2] == '0' && input[3] == '0' &&
       input[4] == '9' && input[5] == '4' && input[6] == 'D' && input[7] == '4' &&
       input[8] == '8' && input[9] == '1' && input[10] == 'A' && input[11] == 'C' )  //if the card id read is 6D0094D481AC
    {
      Number=1;                    
      Serial.println("GROUP 1"); 
    }
    else if(input[0] == '6' && input[1] == 'D' && input[2] == '0' && input[3] == '0' &&
       input[4] == '9' && input[5] == '4' && input[6] == 'D' && input[7] == '6' &&
       input[8] == 'F' && input[9] == 'F' && input[10] == 'D' && input[11] == '0' )    //if the read card id is 6D0094D6FFD0
    {
      Number=2;                   
      Serial.println("GROUP 2");
    }
     else if(input[0] == '6' && input[1] == 'D' && input[2] == '0' && input[3] == '0' &&
       input[4] == '9' && input[5] == '4' && input[6] == '9' && input[7] == 'C' &&
       input[8] == 'B' && input[9] == 'B' && input[10] == 'D' && input[11] == 'E' )
    {
      Number=3;
      Serial.println("GROUP 3");
    }
     else if(input[0] == '6' && input[1] == 'D' && input[2] == '0' && input[3] == '0' &&
       input[4] == '9' && input[5] == '4' && input[6] == 'B' && input[7] == '5' &&
       input[8] == 'E' && input[9] == 'B' && input[10] == 'A' && input[11] == '7' )
    {
      Number=4;
      Serial.println("GROUP 4");
    }
     else if(input[0] == '6' && input[1] == 'D' && input[2] == '0' && input[3] == '0' &&
       input[4] == '9' && input[5] == '4' && input[6] == 'C' && input[7] == '0' &&
       input[8] == '2' && input[9] == '3' && input[10] == '1' && input[11] == 'A' )
    {
      Number=5;
      Serial.println("GROUP 5");
   }
  }
}

please Help

Posts made by shahidpk