From http://www.linuxjournal.com/content/low-power-wireless-6lowpan-ieee802154-and-raspberry-pi
#http://elinux.org/RPI_vcgencmd_usage root@raspberrypi:~# \
for id in core sdram_c sdram_i sdram_p ; do
echo -e "$id:\t$(vcgencmd measure_volts $id)" ;
done core: volt=1.20V sdram_c: volt=1.20V sdram_i: volt=1.20V sdram_p: volt=1.23V
#Hardware http://openlabs.co/store/Raspberry-Pi-802.15.4-radio https://git.openlabs.co/rpi802154.git