If you are the original author, please access your User Control Panel and update it.
The first incarnation of Sandbot seems to have yielded some successful results (see https://www.robotshop.com/letsmakerobots/node/30447). It can successfully navigate its way around a room and avoid obstacles along the way. The robot's mechanical structure is sound, there is plenty of motor torque and the design is modular enough to allow for easy expansion. It was implemented with a PIC16F88 and there is still a lot of mileage in that processor yet. Many thanks to those that offered good advice ...
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/sandbot-gets-a-brain-transplant