I want to add NFC (Near Field Communication) to a cheap consumer product with an existing microcontroller.
I need to be able to pass a chunk of static data to a smartphone.
I'd like to be able to pass dynamic data to the smartphone in both directions. (ie. have the microcontroller use NFC as a low speed communication link). But, not if it significantly adds to the system cost.
Low system cost and low power are both important.
There seem to be many different wireless technologies calling themselves NFC, I want the kind that will work with smartphones.
What device(s) would be best for this task?