NFC temperature sensor / pressure sensor
I found this today and thought it worth sharing:
http://www.ti.com/tool/RF430-TMPSNS-EVM
Its a $10 temperature sensor patch which powers and transmits data via NFC. No battery, no bluetooth, just a flexable patch.
The magic behind this is the RF430FRL15xH microcontroller:
http://www.ti.com/product/RF430FRL152H
The microcontroller can be piggy backed or used in your own circuit with different sensors. Here the original temperature patch was piggy backed to add a pressure sensor as well:
https://hackaday.io/project/7077/logs
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Edit: I didn't notice how this was a dead thread till I got a badge...