how to identify uhf rfid tag in vi-85f rfid reader using arduino?

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C++

#include "Arduino.h"
#include<SoftwareSerial.h>
SoftwareSerial mySerial (17,16);
unsigned char incomingByte;

void sendIdentifyCmd ()
{
  mySerial.write (0x40);    
  mySerial.write (0x04);
  mySerial.write (0x01);  
  mySerial.write (0x01);
  mySerial.write (0xCD);
  //mySerial.write (0x32);                
#ifdef DEBUG
  Serial.print (0x40);
  Serial.print (0x04);
  Serial.print (0x01);
  Serial.print (0x01);
  Serial.print (0xCD);
  //Serial.print (0x32);
  Serial.println ();
#endif
}

void setup ()
{
  Serial.begin (9600);
  mySerial.begin (9600);
  Serial.println ("begin initial Serial!\n");
}

void loop ()
{
  sendIdentifyCmd ();
  delay (2);
  while(mySerial.available ()<64)
  {
      incomingByte=mySerial.read();
      Serial.println(incomingByte,HEX);
      Serial.print (' ');
    Serial.println("no tag");
      delay(1000);
  }
  Serial.println ();
  delay (1000);
}

this is my code..pls help me

Posted 1-Dec-15 18:09pm

Member 12180021

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George Jonsson 2-Dec-15 1:15am

So what is the problem?

1 solution

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Kornfeld Eliyahu Peter · Answer 1 · 2015-12-01T20:09:00

Solution 1

It is not clear what is your problem, and how exactly did you connected to the reader, but there are a few things you should check...

1. Did you crossed the tx/rx lines? You should!
2. SoftwareSerial has its limitation about what port can be used as rx. Check here: https://www.arduino.cc/en/Reference/SoftwareSerial[^], and consider to use an Arduino board with more than one hardware serial (Mega?).

// UPDATE

C++

#include "Arduino.h"

unsigned char incomingByte;
 
void sendIdentifyCmd ()
{
	Serial2.write (0x40);		
	Serial2.write (0x04);
	Serial2.write (0x01);	
	Serial2.write (0x01);
	Serial2.write (0xCD);
}
 
void setup ()
{
	Serial.begin (9600);
	while(Serial);
	Serial2.begin (9600);
	while(Serial2);
	
	Serial.println ("begin initial Serial!\n");
}
 
void loop ()
{
	sendIdentifyCmd ();
	
	delay (2);
	
	while(Serial2.available() < 64)
	{
		incomingByte = Serial2.read();
		
		Serial.println(incomingByte,HEX);
		delay(1000);
	}
	
	Serial.println ();
	delay (1000);
}

Posted 1-Dec-15 20:09pm

Kornfeld Eliyahu Peter

Updated 1-Dec-15 20:53pm

v2

Comments

Member 12180021 2-Dec-15 2:26am

thanks for rly..
i connected VI-86 uhf rfid reader with ttl 232 converter with arduino. previously i mention my code when i upload the the code in uart nothing is display after scanning
the the tag

i also used cross connection between ttl232 and arduino mega
pls help

Kornfeld Eliyahu Peter 2-Dec-15 2:28am

What board do you use?
What TTL-RS232 converter do you have?

Member 12180021 2-Dec-15 2:45am

arduino mega 2560
and ttl 232 used for rs232 converter

Kornfeld Eliyahu Peter 2-Dec-15 2:52am

I see...
You made a huge mistake here...Port 17(rx)/16(tx) are hardware serial port!!! It called Serial2!!!
Do not create a software serial on those port, but instead of mySerial use Serial2!!!

See the code in my answer...

Member 12180021 2-Dec-15 3:38am

ok

Member 12180021 2-Dec-15 3:59am

same problerm...nothing is display on uart

Kornfeld Eliyahu Peter 2-Dec-15 4:54am

Can you connect your reader to a PC via RS232 and test it first there?

Member 12180021 2-Dec-15 4:57am

on demo software via rs232 on pc, tag is scan perfectly.
but when i upload the program on arduino mega board as your code the output is blank.pls help me

Kornfeld Eliyahu Peter 2-Dec-15 4:59am

If you have the source of the demo program, your first step should be to reproduce it in Arduino...

Member 12180021 2-Dec-15 5:06am

actually this program is run on arduino and demo software is for vi-86 reader

448866 3-Jun-16 11:28am

Hello,

I have same problem, RFID works perfectly on PC, but in Arduino via rs232 doesn´t work.

Help me pls!