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Author Topic: Finding the right RFID Sensor  (Read 462 times)
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I am working on a project that requires two RFID readers. They need to have a sampling rate of at least a few samples per second, and need to be able to differentiate among ~10 RFID tags. A program is run that uses the two readers to detect the tags, and play a sound based on the type of tag (there are two “types,” ~5 tags of each “type”). We have been told that almost any MicroController board will work, and we have one in mind.

We now have the problem of finding good RFID readers. There are a few considerations here. One is how the readers interact with the program. Ideally, we would like the program to be able to run both readers at once, versus switching between the readers many times a second (effectively only using one reader at any given moment). Are there specific RFID readers that can only do this with certain MicroControllers ? Also, what type of RFID readers would be most effective for our goals, especially given the previous consideration? Will USB work? Any advice in general would be very helpful smiley
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You need to decide what type of RFID reader you want.

The cheapest is the EM type and there are lots of readers to do this, however a lot of them are expensive. Readers usually output in the form of either serial or wiegand format. This project uses three wiegand readers feeding into the arduino at the same time:-
http://www.thebox.myzen.co.uk/Hardware/Crazy_People.html

The EM type (125KHz tag) can only cope with one tag in the field at any one time. If you want more than one then you have to go for a type with collision avoidance.
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Are there specific RFID readers that can only do this with certain MicroControllers ?
No most controllers will be able to handle RFID.

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Will USB work?
A USB RFID reader will work (well two of them)  but then you do all the project on the PC and do not need an arduino.

You could make your own reader, you can get the chips from here:-
http://www.apdanglia.org.uk/shoppingcart2.html#EM4095-IC
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