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Hi all, this tutorial was brought to you by the Openly Published Environmental Sensing lab at Oregon State University. To learn more about their work visit their website available at www.open-sensing.org.

In this tutorial, we will walk through how one can read RSSI values from an UHF RFID tags using the Cottonwood UHF Long distance RFID reader module. An RSSI value is a measurement of received signal strength. It's an acronym for "received signal strength indicator". It's often used for WIFI signals. Here is a good article from MetaGeek that explains it further: http://www.metageek.com/training/resources/unders...

RSSI values can be affected by many variables including, the distance between the tag and antenna, environmental interference, or moisture. Often, RSSI values can be used to determine which tag to isolate in the case that there are multiple tags picked up by the antenna.

Step 1: Parts List

  1. Cottonwood UHF Long distance RFID reader module
  2. Arduino UNO
    • Other models should work but might need a slight modification, see Code section for more information
  3. Antenna
  4. UHF RFID Tag
    • Any Class 1 Gen 2 tag should work
    • The ones I used and that are pictured are SMARTRAC DOGBONE
<p>Cool design. Good luck in the Microcontroller contest.</p>

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