Now something very strange has happened. I added an HP touchscreen monitor to the laptop interfacing with the Arduino. That is, the Arduino is connected to the laptop, and the monitor is also connected to the laptop.When the touchscreen monitor is connected, range on the RFID reader drops to almost nothing. By experimentation, the RFID range dies when:1) The touchscreen monitor is plugged in, and...
7.0.html]http://arduino.cc/forum/index.php/topic,53517.0.html[/url]If I power the reader from a battery instead of the Arduino power supply (and disconnect the serial line to the Arduino) the read range goes back to normal So I am going to try my original idea of powering the reader from a separate supply, and optoisolating the serial data.
Actually now I think about it some RFID stuff is very low frequency like 27MHz isn't it?
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