Recent content by wilf_nv

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    Simplest dark sensing LED flasher

    Simple is as simple does and it doesn't get any simpler than this. <A href='' Target=_Blank>External Web Link</a> Flashes LED when very dark. Easily detects the presence of a RED LED emitter across a dark room. Several of these...
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    4096 LED sensor/display

    Scaling the Hex Led Sensor circuit, discussed earlier, to control a large array of LEDs for active mirrors, etc is not practical. With 10ms sensing times for each LED sensor input, multiplexing is not an option for reason of excessive flicker. And using a 18X for each 6 LED sensors would...
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    hex led sensor

    <A href=' ' Target=_Blank>External Web Link</a> shows an example of LEDs used as self illuminating photo sensors. I used garden variety high efficiency clear lens red LEDs with 1K resistors for current limiting. The bidirectional port...
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    sea of keys encoder

    I have posted a little writeup of a new 08M keyboard and touchpad encoder design that may be of interest. Amazing how much can be done with so little. enjoy wilf
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    H-bridges - chip or discrete?

    Stan Swan wrote: Although I applaud making an H bridge for it's educational benefits,the L293D is THE industry standard approach for modest power motors &amp; just HAS to be considered ! I recall it's arival was akin to the 555 (1972)whereby zillions of discretes were done away with. Crucial...