I had a chance to build the iitsii Robugtix hexapod and took some time to play with BigFoot Inverse Kinematics engine that comes with the platform. The engine really simplifies the gait management with the six legged platform. The build was easy, even though you have to manually position 18 servo motors by hand. The documentation is great and includes a serial command reference if you want to do some arduino interfacing work.
Over at RJ McNamara’s Blog, he has put together a new Quad Holomonic Drive Robot based on the LEGO® NXT. The robot uses dual Rotacaster® Omni-wheels on each of the four axis’s and four LEGO® NXT Ultrasonic Sensors.
Over at TechnicBricks there is a fascinating post that does a great job of visually explaining the Killough Platform to the uninitiated. As you know I am a big fan of holonomic drive robots and if you are new to the concept, they do a great job of explaining the theory without over complicating the discussion.
Here is an idea I have been playing with for a little while. Instead of simply doing a car with regular steering, I wanted to try a split chassis design where the front of the car rotates in the direction you want to turn. Here are two attempts, but I abandoned any further design after driving both around with my phone via bluetooth. The steering is too inaccurate to use for an autonomous robot, but it is fun to drive.
The other night I was researching building a balancing Segway like robot with the Lego Mindstorms NXT kit. I wanted a robot that could balance on two wheels and could move forward and backward. I also wanted the robot to recover when “pushed”.
I was familiar with Steve Hassenplug’s Legway built on the Lego RCX platform, but I wanted to tackle the challenge with the NXT. Luckily, I found Philo Hurbain’s NXTWay. I was intrigued enough to build a copy and try out the programming.
It is quite hard to get the balance right and in the end I created a very aggressive robot that I can push around and it will mostly right itself. Here is the video of the final creation.
I have been working on a few different designs for a holonomic drive robot. A true platform like the other killough platforms made from Lego would probably contain wheels that rotate differently, but I wanted to publish this design because it is interesting.
I tried two different versions that you can see in the movie below. One version uses wheels but I also built this platform into a three legged walker.