Let's Make Robots!

sensible discussion on "open collector circuit" for sensor

Just found this on hackaday:

" ... Why open collector?
An open collector output doesn’t toggle between high and ground, it toggles between ground and unconnected. The unconnected state, also called high impedance, exerts nothing on the output and allows the signal line to float.
Open collector outputs are useful when several sensors need to share the same microcontroller pin. ..." (my emphasis)

Theo Jansen style robot leg: prototypes #4 and #5

Continuing where I left off (after a stiff binary interruption)...

This picture compares prototype #2 with an angled profile version:



The angled "L-profile" introduces a new property in the design: chirality. All of a sudden, it matters which direction you want to fold the joints. Compare the symmetric #2 on the right:

Theo Jansen style robot leg: prototype #6

(continued from here)

I am busy with the tweaking and fine tuning of my plywood version of prototype #5. I had no idea this would turn into a different design I now call #6.


This photo shows #6 in its leftmost position. It just cannot reach the extreme. There are still several small bits of plywood touching that should not be touching. Again with the jig and with the saw!


Theo Jansen style robot leg: prototype #2 and #3

I started tinkering with "Theo Jansen legs" again (follow the link first if you don't know what that means).

I am prototyping in corrugated cardboard and trying to come up with a design that could be produced in large numbers (six at least) in plywood.


Chase The Light, bumping into everything
Here is a brainless, nameless, clueless little vehicle that chases the light. It's a photovore. Well, it actually is just a photophile. It does not eat the light, … Read more

Theo Jansen style robot leg: prototype #1

For my dreamed symbiotic robots, I am looking for an alternative locomotion. For the passive robot (the trailer) anyway. The active tractor probably needs tracks. I heard Theo Jansen say on TED (improving on the wheel, 4 minutes into the video) that his design for a legged creature is (theoretically) more energy efficient than wheels or tracks.

diy multi touch input = interesting sensor

Two sets of copper wires in opposite directions, separated by a layer of rubber. When pressed, the two wires respond to eachother as the two plates in a capacitor. The harder you press, the closer the "plates", the higher the capacity of the "capacitor".

Eight wires per set, sixty four permutations. Watch this video for the explanation by the maker himself. (Vimeo does not embed on LMR)

The Pulse - 2008w49

LMR on the Brain
Sensing the living LMR community since 2008w43.

The Pulse - 2008w50

LMR on the Brain
Sensing the living LMR community since 2008w43.

OH man, I am slow!

It just dawned on me: GroG's goatee in his avatar is in fact a 9V battery!




Keep on tingling GroG!