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News - Circuit Bending RFID | about 3 years ago

If this does turn out to be a 125 kHz HID card, they’re pretty easy to read and emulate. I built a really simple homebrew HID card reader a while back as a garage door opener, and just for fun I built my own emulated HID card using just an AVR and a coil.
Here’s a schematic and details on the HID card reader. It’s just a Propeller microcontroller and a few passive components:
http://forums.parallax.com/forums/default.aspx?f=25&m=287204
And this is a blog post on the AVR firmware that emulates a HID card:
http://scanwidget.livejournal.com/32928.html
Cheers, and good luck on your quest to carry fewer things (and take more of them apart)!
—Micah

Product SEN-08940 | about 4 years ago

I’m really happy to see these at Spark Fun. I’ve bought these from Parallax before, and I can vouch for how amazing these chips are. Response time is very fast, and the overall noise is quite low.
I used two of these as servo feedback sensors to build a laser projector out of hard disk voice coils:
http://www.flickr.com/photos/22238428@N05/2932267038/