Here's the contest entry video.

June 27--using an onboard power supply and Arduino, the dog can stand untethered.

The Plan

Increase torque of legs

Decrease weight of legs

Build a stiff, low weight body

Take steps

Add onboard power


Take steps 

I had to show this . . . Google's AIY Vision Kit can be used to detect human faces or smiles (and probably other things). This will allow my dog to "know" that someone is there and if they are smiling. More information can be found in log number 10, "Google AIY Vision."

Spot Mini is an amazing (perhaps scary) robot dog built by Boston Dynamics--not for sale.

If you want to purchase something similar, a company in China produces a research platform for around $30,000. Another legged platform, Anymal, can follow you into an elevator.

Using a 3d printer, off the shelf servo motors, an Arduino and a couple of ultracapacitors; I have started something along the same line--but the cost is more like $300. 

She's young and shaky, but my dog can now stand. The body is longer and the rear legs reversed--look to my log, "The Forces Are Not All With Me."

Here's where we "stand" on March 28.

This is where it started.

Here's where I am on March 16.

My first "shoulder connection" put all the "up/down" and "rotate" stress on the servo motor.

This looked like a bad idea, so I created a bearing block and heavy shaft to absorb the "up/down" load and let the servo motor's gearing handle the rotation only.

The bearings are snowmobile bearings available on Amazon.

I designed the servo motor mounts such that there is a sort of "back bearing" opposite the shaft so that it is easier to attach moving limbs.

The first foot was a wheel--but that rolled all over the place, so I created a movable flat pad for better traction.

I mounted a digital voltmeter up on the body--just to keep track of what was available for the servo motors.

So, there's a long way to go, but this walkable platform (when it works) will be useful for robotics on smooth or rough terrain.

On February 27, the first attempt at standing was made. A couple of the joints couldn't take full speed movement--we learn by trying!

Now, with the feet not rolling or bending, it is possible to get the front and back to lift together.