Pressure sensing, regardless of the tag used, requires an extra mechanism in addition to the tag itself. For example, you could have the pressure change cause a small movement in something with a metal coating. A tag placed appropriately could sense the change in the position of the metal, and the reader would interpret this as a pressure change. Both the RFM2100 and RFM3200 could be used in this way, but the exact details of the required mechanism would be different. This is a somewhat advanced topic, so we may need to have more in-depth discussions offline.
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Axzon (formerly RFMicron)
3700 N. Capital of Texas Hwy
Austin, TX 78746
Tel: (512) 535-4647 Axzon.com