The RFM69 units come in a 433 MHz variety, which does give a little better range (the nRF24 operates only in the 2.4 GHz band, which is more affected adversely by walls).
Unfortunately, 433 MHz is not an ISS unlicensed band in the U.S.
Love the robot! I wonder if the four cell pack is NiMH, or other?mikronauts wrote:I've had excellent success using 5200mAh and larger USB power banks.
One example: http://www.mikronauts.com/robot-zoo/elf-2wd-pi-robot/