Grove NFC v1.1 + Teensy strange problem

I’m using v1.1 grove nfc driving with teensy.
I loaded the example program to read tags that came with the library itself, and something strange happens; it works when it wants.
I connect the power and put the tag and reads well, another time connect the power and nothing works. Does anyone know what is happening?


  1. Please check if the communication between Teensy board and Grove NFC 1.1 is happening properly. Apart from UART, Grove NFC supports I2C interface (See Wiki )

2.The distance between Tag and NFC antenna must be very minimal (few mm).

Thanks and Warm Regards