NFC temperature sensor / pressure sensor
I found this today and thought it worth sharing:
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:
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: