Datel Duo-FX Wireless Nunchuck

Hi guys..

I've bought a duofx wireless nunchuck, because I read that it works with arduino. I found this page that is dedicated to datel nunchucks:

https://github.com/radekk/wii-duofx-nunchuk

Unfortunately with both the configurations (with or without pull up resistors) the nunchuck doesn't work: in both cases the reciever power led is on, but nothing happens on the sync led when I press the sync button on the nunchuck..

The configurations I test are the following (from the previous site)

Anyone has suggestions?

Thanks in advance!