Just a quick note to say that we have survived MakeFashion, with (hopefully) positive outcomes, and if you haven't attended, the highlights of the show are available on our Flickr photostream.
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.
Just a quick note to say that we have survived MakeFashion, with (hopefully) positive outcomes, and if you haven't attended, the highlights of the show are available on our Flickr photostream.
We've been working hard to bring you a conundrum* of new protoboards and other handy items to go with them (*conundrum - a collective noun used to describe massive amounts of protoboards inhabiting our shelves). This issue of Friday new products features roughly half of the whole selection we offer, which can cover pretty much […]
Solarbotics will be closing for the winter holidays as of Tuesday, December 24th. We will be open again December 30, 2002.
Instructables is an ever-expanding documentation platform for sharing DIY projects of all kinds, from pancakes to electronics to making anything fly. Since 2005 when it became what it is now, Instructables grew from hundreds to more than a hundred thousand projects. It's a great community of fellow makers from around the world fueled by curiosity […]
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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.