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Littledog is a small quadruped made of laser cut and 3D printed parts that uses 2 micro-servos to walk. She uses a ping sensor to detect objects and will back up and turn slightly to avoid imminent collisions. She uses an LED to indicate what she thinks that she is doing.
Her microcontroller is an AT Tiny 44u but any Arduino compatible microcontroller with sufficient IO pins should work.
I was able to source the materials and parts for 40 of these at a cost of approximately $29 each, not including amortized cost of the 3D printer and laser cutter.
30 Children between the ages of approx 8 and 15 were able to assemble these, with help from some adults who had rehearsed, in about an hour and 15 minutes.
I'll work on improving her gait but her behavior was good enough to get the point across and everyone seemed to enjoy their new pets which are approved by even the most stringent of residential building boards.
see her home page photos and pages here on this Wiki for instructions
Littledog by Raymond Blum is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.