March 14th - 03.14 So it stands to reason that at 3:09pm this afternoon (15:09), you should take a break, have a piece of pie, and remember how to associate the circumference of a circle with its area! Read More...
You want a simple Photovore? This very tidy design by Solarbotics' own Grant McKee is based on a technique developed by Mark Tilden - Shok architecture:
Here's video of the test robots being tuned as a 177kB Windows Media Format (WMV) file or as a 168kB RealMedia (RM) file.
ShokPopper V1.0 (click for circuit diagram) - GrantM Aug 2001
Theory of operation:
"Shok" architecture is a technique pioneered by Mark Tilden describing controlled state changes of Bicore style circuits via chip power or enable toggling. When a Bicore circuit is powered on, it will resume a state opposite to what it was when it was powered off, this effect can either be duplicated by pulsing the enable line or by pulsing power to the chip itself. This is called "shoking" the Bicore. The power-on state can also be pre-determined by biasing the voltage across the Bicore capacitors. A photodiode attached directly across the Bicore charge capacitor will pre-bias the shoked output. The addition of tactile sensors is easily implemented by attaching a switch from the input of the Bicore to +Vdd. When the switch is closed, it forces that side high, presetting the state of the Bicore on the next pulse cycle.
Probably one of the simplest photovore circuits to date, the core circuit consists of a 6 part count and a solar-engine. Either 74AC240 or 74HCT240 will work but we recommend using the AC series for better output drive current. The ShokPopper will not work under battery power unless the enable line is pulsed.
Solar Engine to use with Shok:
The best solar-engine to use is the Miller engine. For the ShokPopper Photovore we used a Miller engine consisting of:
The Bicore Circuit Consists of:
The Miller engine switches the ground line of the circuit.
The theory of operating is very similar to that of the shok popper except that the head now only uses one motor, the photo head does not "lock" on but will continually seek for the brightest source of light. Nice effect if you want a continually seeking, dynamic device on a stationary base.
March 14th - 03.14 So it stands to reason that at 3:09pm this afternoon (15:09), you should take a break, have a piece of pie, and remember how to associate the circumference of a circle with its area! Read More...
Today is Friday. Lets celebrate by using only green towels and omitting the letter R. Or just seeing what new stuff we got: Arduino Yun $71.95 Take a wireless router-on-a-chip, and stick an Arduino Leonardo to it - that's the new Arduino YUN! Evil Mad Science The Three Fives Kit $35.00 Take a venerable 555 […]
Don't even bother reading this introduction - skip on ahead and go to the first link in the list. It'll blow your mind. Medusa -Proximity Aware Multi-Touch Tabletop This interactive surface (which is actually a version of Microsoft Surface) uses a mind-boggling 138 proximity sensors to detect people around and using the table. As far […]
Hi all. I went through the effort to invite y'all into our new digs, but didn't stand here at the door to welcome you in! So sorry... Please excuse the sawdust. I'm still pushing the people that push the brooms around here. No matter - everything will be tidied up in no time. The website […]
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Warning: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
Please visit www.P65Warnings.ca.gov for more information. This item was manufactured prior to August 31, 2018.