I entered "sudo useradd -G spi pi" , and it says: "useradd: user 'pi' already exists". So I guess it was already done before.
Anything else I should try ??

What id are you using? root or pi? or are you prefixing your command with sudo? If pi without sudo, then has pi been added to the spi group? sudo useradd -G spi pi I tried it with (.../nrf.../examples/) sudo python send.py. I will try "sudo useradd -G spi pi" when i get back home since i am in coll...

What kernel version are you using? Have a look with uname -r. Have you enabled SPI using the advanced options in sudo raspi-config? My kernel version is 3.12.35+. SPI is enabled in my raspi-config (also commented on blacklist). I am also using spidev from https://pypi.python.org/pypi/spidev . Thank...

Post by luisantunes » Thu Nov 27, 2014 8:13 pm Even after changing the radio.begin() and include 4 arguments, I received this error: File "recv.py", line 14, in <module> radio.begin(1, 0, "P8_23", "P8_24") File "/home/pi/pynrf24/examples/nrf24.py", line 353, in begin self.spidev.open(major, minor) ...