Issue with RFID module
I just got my RFI reader and some tags and got them to work with a BS2 - but there is an issue that I don't understand and can't seem to fix.
I am running a program that I derived from the manual. After hooking the module up and swiping the tag a few times, the voltage at the module's pins begins fluctuating to a degree that makes the LED on the module itself flicker red/green. At this point the readable distance goes way down. As soon as a tag is read, everything seems fine for about 2-3 seconds, until it starts again.
I have tried this directly on a homework board (battery) as well as a breadboard connected to an activity board (9V power supply) - both times with the exact same results.
I also went back to the original program from the manual - same thing.
Do I have a bad module, am I doing something wrong?
Any help would be appreciated.
D.
I am running a program that I derived from the manual. After hooking the module up and swiping the tag a few times, the voltage at the module's pins begins fluctuating to a degree that makes the LED on the module itself flicker red/green. At this point the readable distance goes way down. As soon as a tag is read, everything seems fine for about 2-3 seconds, until it starts again.
I have tried this directly on a homework board (battery) as well as a breadboard connected to an activity board (9V power supply) - both times with the exact same results.
I also went back to the original program from the manual - same thing.
Do I have a bad module, am I doing something wrong?
Any help would be appreciated.
D.
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Chris Savage
Parallax Tech Support
csavage@parallax.com
Same issue on the (older) Activity Board.
The solution is fairly simple - at 7805 or a 2940-5 regulator with appropriate input and output capacitors (see data sheet) connected to a 7.5-9V battery will give you 300 mA of power - enough to run the RFID reader. Just be sure and tie the grounds together.
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Chris Savage
Parallax Tech Support
csavage@parallax.com