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一個小玩具, 只看到一個LED, 但是在暗室就自動發光, 回到亮處自動熄滅. 大小朋友都很有興趣, 想了解為什麼?
this is the archive for some hints, http://www.educypedia.be/electronics/circuitssensorslight.htm
this is design idea of how to uses LED as light sensing element, http://www.edn.com/contents/images/81601di.pdf
this is a project page that visited 8 years ago, the author is really a hobbier for LED in uses for sun light tracking, http://www.redrok.com/electron.htm#led
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