February 19, 2016: I created a flexible patch design that is suitable for lower pressures, and had some prototypes built. These prototypes consist of a Kapton flexible circuit on a PET carrier. The antenna is wound with magnet wire. These work very nicely and they give me a great deal of confidence that I could have higher pressure units created for a low cost and still achieve excellent pressure performance. I would like to make these new patches in higher volume, but the quantity order is too high. I have thought of turning to crowdfunding, but I'd need to know first that people were interested. I posted the original design on Tindie (https://www.tindie.com/products/CaptMcAllister/rfid-pressure-sensor/) for people to sign up for a waitlist for the original revision. If you're interested, please head over and sign up. If I get enough interest, I will look to crowdfund the flexible version.