Hey guys! I'm trying to design a circuit that will detect when someone wearing a passive RFID bracelet is within 12 inches (no more than that, the range is pretty specific for a reason) of the circuit, and turn on an LED. My initial thoughts were to use passive RFID bracelets since they are extremely cheap and require little to no circuitry on the person wearing the bracelet (which is very very important to the project), but it's becomming clear that it's extremely hard to get the range of 10-12 inches out of it without using enormous amounts of power on the transmitters' side. Do you guys have any ideas of how I can make a circuit that will read a passive RFID tag at 10-12 inches without immense amounts of power, or of something else I can use instead of RFID for the same purpose?
The only real requirements are that the bracelet needs to ideally have as little circuitry as is humanly possible (and prefribly doesn't need battery power), and it has to be able to be picked up in a range no more than 12 inches maximum, but definitely at least 8 inches minimum.
Thanks for your input!
--Zac
The only real requirements are that the bracelet needs to ideally have as little circuitry as is humanly possible (and prefribly doesn't need battery power), and it has to be able to be picked up in a range no more than 12 inches maximum, but definitely at least 8 inches minimum.
Thanks for your input!
--Zac
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