Category Archives: Engineering

Supercapacitor Contest Update

Besides the eight project ideas that have been listed as comments to the original contest announcement, I’ve received 39 pieces of contest-entry E-mail, some of which contain more than one project idea.
I’m counting each entry that I’ve received as a separate entry. One piece of email contains a list of thirteen (but number 13 reads “i couldn’t think of anything else, i just like the number thirteen”).

Some of these ideas are just great! Keep ’em coming!

Supercapacitor Contest!

What can you do with a lot of supercapacitors? This is no idle question. I picked up a bag of 100 on eBay. These are sweet: Cooper PowerStor Series A carbon aerogel capactitors with ultra-low resistance. Specifications: 2.5 V, 1.5 F, with nominal equivalent series resistance of 60 milliohms at 1 kHz. I recently saw these at Digi-Key for $9.60 each. These aren’t the wimpy memory backup caps that aren’t rated for enough current to drive an LED. These are power caps, meant for high current charge and discharge.

Obviously, these are meant for great things. It only leaves one question: What great things should I do with them? To help answer that, I’m holding a contest: Come up with the best use for a pile of supercaps, and you’ll get ten of them to play with.
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Making the “Evil” LED logo

On this breadboard there are four Kingbright PSA08-11HWA sixteen segment displays that I got from BG Micro some years ago. The PSA08-11HWA comes in an eighteen pin (16 + decimal point + common anode) dual-inline package. Normally that’s great– ideal for use in a breadboard. Note that the rows of pins are oriented 90 degrees from how you’d like them to be– this is really only good if you want your displays to be read top-to-bottom in the breadboard, rather than left-to-right. Turn your head sideways to read this display saying “M7H7.” Controlling these displays is not difficult. However, in this case, where you don’t need to change what’s displayed, it’s absurdly easy.
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Interactive LED Dining Table

This is our dining table. We built it because we needed a new dining table, and I guess we’re just that kind of people. It has a frosted glass top lit by 448 multicolored LEDs that respond, in a complex and gentle fashion, to input generated by motion above the table while we eat.We showed it off at the Maker Faire. Click on the photo to get to see some other photos of the table construction. Lenore was interviewed about the table at the faire, see Lenore’s CNET inteview.

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