By Herp News
Last month, we highlighted wildlife tracking hardware and software that allows
An RFID chip worn on a triathlete’s ankle strap at right is read by the receiver on the left to record their start, finish, and passing by of course markers. Photo: rupp.de, Wikimedia Commons
Commercial applications of RFID technology have been common since the 80’s – it is found in badges worn by medical or security staff, electronic toll readers, and hotel or office entry key cards. Only recently have scientists begun to apply RFID to wildlife research beyond merely mark-recapture purposes. Bridge has created a website that provides information and instructions to build the reader system, ranging from a list of parts to a complete circuit board design and accompanying instructional videos. The website is directed specifically at animal researchers with limited budgets.
“People are sometimes surprised when I say that I started with no engineering background and figured out how to build an RFID reader by surfing the Internet,” said Bridge. “But that sort of thing is becoming commonplace. I’ve corresponded with several people, also non-engineers who have done the same thing.”
How does the RFID work?
RFID technology requires three main components: a uniquely identifiable tag, a reading device with an antenna, and software. A passive integrated transponder (PIT) tag is activated as it comes into contact with the electromagnetic field created by the antenna. When the tag passes near a reader, it is activated to send its unique alphanumeric code to the reader module that is then stored in a memory chip.
The system uses radio waves to capture data from the tag, so while the tag must be relatively close to the reader to be recognized, it doesn’t need to be in line of sight.
Use in the field
To integrate this technology into a biological study, a researcher attaches the tag to an animal and places the tag reader in a spot that is regularly and reliably visited by tagged individuals, such as a nest, den, or birdfeeder. The researcher sets the amount of time the unit will spend reading (probing the antenna’s range for a tag) and resting (intervals in between read attempts) to best balance the collection effort and energy use. The more time the system spends reading, the more battery it will use. If you are placing the antenna at the entrance to a nesting cavity where birds typically pass by through quickly, intervals will have to be set shorter. If you are looking at tortoise movement through culverts, you will have a little more time!

Waterproofing on the cheap: the DIY RFID ready for the field Photo: Eli Bridge, University of Oklahoma
Although Bridge and his colleagues designed this do-it-yourself reader with birds in mind, it can be applied to a wide range of taxa. The tag does not require batteries and so is both lightweight and …read more
Read more here: herpetofauna.com
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