text: Q:
  
  RFID Reader Really Slow
  
  I did some research on different inexpensive RFID readers and I ended up building my project around this one 
  https://www.parallax.com/product/28340
  I also bought these tags:
  https://www.parallax.com/product/28161
  The problem is that whenever I get close with the tags, sometimes it doesn't read them at all, other times it takes 1-10 seconds to read it. 
  I use this code to test it on my ubuntu (I tested it on a raspberry pi as well, same issue):
  http://theatticlight.net/posts/Using-a-Parallax-RFID-reader-on-the-Raspberry-PI/
  I am not sure if this is a problem with my reader or something else I am doing wrong. 
  Would a 13MHz reader/tag have faster reading speeds? Is this problem related to the specific antenna of the module? 
  
  A:
  
  I built a custom RFID card reader for the exact same protocol you are using and was able to read cards every time in just a few hundred milliseconds tops...
  My reader included an Atmega328p connected to LC tank (large wire wound coil for L to act as antenna).. The LC tank was then reconnected to a pin of the Atmega through a 2 stage filter and then a schmitt trigger. 
  I would say its a problem with the reader or something you are doing for sure... 125kHz tags are not that slow. Should be MUCH faster (as I stated, just a few hundred milliseconds tops, I never logged exact timing... but it appeared instantaneous to all users)
  
  