Grove NFC v1.1 + Teensy strange problem

Products & Technology Grove
#1

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?

#2

Hello,

  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