*Note- The bot shown in the video is an older version. The pictures show the latest design with the sensors for automation.
Through out the project sensors where a constant issue, we found that the sonars we used where inconsistent at best and at times nonfunctional.
In addition the cortex that controls the bot only has 12 digital sensor ports, with each sonar using 2, we quickly ran into the limit.
One thing that we found particularly difficult was keeping weight down, Initially the bot was far to flimsy and would bend under its own weight. To fix this we ran a "spar" down the middle of the bot resulting in an much more rigid build. In addition struts where added to stop the bot from folding in on its self.
The stair climber has 8 wheels, 4 driven 4 non driven. The 4 driven wheels are on the stilts, allowing the bot to drive both on the ground and while lifted.
The bot essentially consists 5 subsystems, the undriven wheels, the driven wheels, the vertical motion rails, the vertical drive, and the drive system.