RSSLED Throwies
Read this article in MAKE:
06: Robots, Page 116.
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Subscribers—read this article now in your digital edition!Make and toss a bunch of these inexpensive little lights to add color to any ferromagnetic surface in your neighborhood.
From the column 123
Links
- Nerd Alert, The Video
We decided to use LED Throwies to promote the Dutch soccerteam in the coming World Cup. - Newark InOne
- cheapbatteries.com
- Amazing Magnets
- HB Electronic Components
Errata for this article
Correction for page 116
The LED Throwies article on p. 116 lists the wrong size magnets to be used. The size of the magnet should be 1/2" diameter by 1/8" (not 1") thickness.
MAKE: Noise — Discuss this article
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- Doesn't last nearly as long as they say
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The article says this device uses CR2032 batteries.
The spec sheet can be found here: http://www.panasonic.com/industrial/battery/oem/images/pdf/Panasonic_Lithium_CR2032_CR2320.pdf
These batteries have a capacity of around 220mAh. At 20mA to drive an LED, the life expectancy should be around 11 hours. However, these batteries are designed to supply microamps. Shorting them through an LED reduces the capacity to about 80mA, or 4 hours of life, according to the spec sheet I linked.
Also at the prices cited in the magazine, these cost $1 each to build and you're supposed to "toss a bunch" what a joke. People can find better ways to amuse themselves than throw dollar bills away, you can toss 10 throwies or enjoy a movie for a couple of hours.Posted by Oracle1729 on May 17, 2006 at 00:18:24 Pacific Time
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