An inductor and 8-pin microcontroller are all that make up this barebones RFID tag. You might have done ... This one uses a PIC 12F683 but should work with just about any 12F or 16F model.

The answer lies in an RFID chip attached to the inside of the bib each runner wears, which is read as the runner crosses the line to ensure that their time is recorded among the hundreds of other ...