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Thanks for the reply. I guess I'll do some experimenting as soon as I can get the snake untethered (electronics and batteries onboard). I do want it to go as quickly as it can.
Very cool project. I am making a robot snake with 3d printed parts and am using your neat math for the serpentine motion. Question though, if you have a 12 segment snake (12 servos), why did you calculate angle of lag between segments using 11 as the divisor? I plan to increase my current 12 to 16 segments. Should I divide 2Pi by 15?
I did make it, but gave up trying to get the moon to go around. It's a wonderful design, quite thorough and well documented. I did enlarge the x&y dimensions of the gear arms by 1.5%. Also there was a bit too much reliance on superglue so I used set-screws to secure the gear arms and the body to the center shaft (threaded into the plastic). To mount the slip ring, I replaced the motor driven gear with a gear with riser and flange. Also I got fancy for Earth and used a beautiful little painted marble I bought on Ebay.
My dream is to have a heads up karaoke display in the car so I can sing while driving. My vague plan is to use an Arduino with MP3 module to send audio to the car's stereo and send synchonized text to the scrolling display on the dashboard. However most karaoke files are MP3 + a CDG video file. I'd need something like an SRT file where the timing and words are in text. Ideas?