RDM6300 125KHz (ID) RFID reader module

Wired it up to an Arduino and had it beeping within an hour—the 125kHz read range is solid for a mini module, and it handles my EM4100 tags without a hiccup. For the price, this thing is perfect for a DIY door lock project.

Finally got it reading within minutes of connecting to my Arduino Uno, the tiny module fits easily on a breadboard. The 125KHz read range is perfect for my office door lock project, even through thin plastic.

Having wired this up to an Arduino, I was surprised how clean the data output is, and the small footprint makes it easy to fit into any enclosure.