RFID reader with card availble signal?

Forum 2005-2010 (read only) Hardware Interfacing
1

I would like to find a RFID reader with a card available signal so I can easilly hook up multiple readers with NewSoftSerial with a minimal chance of loosing reads. I've found a reader that gives a card available signal. When a card is detected this pin is high. After 6ms, TX outputs data. Then it becomes low after TX output finished:
http://www.emartee.com/product/41968/125Khz-RFID-Mini-Module-Kits#
I've tested a setup with four readers, and it works just fine. The problem is that these don't give a strong enough field to activate small glass tags, which I need for my project.

Anybody knows of a better reader with a card available signal?

2

may be try this RFID Reader ID-12LA (125 kHz) - SEN-11827 - SparkFun Electronics this gives a signal when card is in its vicinity

3

That's one I have here at home. :slight_smile:

The problem is that this LED signal takes a long time, more than the time needed to send the serial info. I need fast response times. But last night I managed to find the solution. Take the LED signa from the id-12l, and when this is high give a reset signal to the id-12. This way it behaves just like the other type of reader I mentioned above. The difference off course is that an extra pin is needed, but that is no problem.