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%DASHBOARD{ section="dashboard_start" }% %DASHBOARD{ section="banner" image="%PUBURLPATH%/Velo/EWheel/pcb-dash.jpg" title="How does _Velo Bling-Bling_ work?" titlestyle="color:#F00000;" }% %DASHBOARD{ section="box_start" title="Mode of Operation" width="472" height="350"}% Dank dem [[http://de.wikipedia.org/wiki/Stroboskopeffekt][Stroboskopeffekt]] entsteht für das Auge den Eindruck, als ob das Bild stehen würde. Die LEDs müssen dafür im richtigen Takt ein- und ausgeschaltet werden. Für ein Radumdrehung braucht es etwa 750 ms bei 10 km/h, bei 100 km/h sind das 75 ms (angenommener Radumfang bei einem Rennvelo ist 2.1 m). Der Abstand zwischen zwei LEDs beträgt 5.12 mm, im gleichen Abstand werden die LEDs geschaltet, das ergibt bei Maximalgeschwindigkeit eine Einschaltdauer der LED von 270 us (d.h. weniger als 0.3 Tausendstelsekunde). In dieser Zeit müssen die 16 LEDs auf der Vorderseite und die 16 LEDs auf der Rückseite geschaltet werden. %DASHBOARD{ section="box_end" }% %DASHBOARD{ section="box_start" title="Stroboscopic Effect" width="472" height="350"}% The stroboscopic effect is a visual phenomenon caused by aliasing that occurs when continuous motion is represented by a series of short or instantaneous samples. It occurs when the view of a moving object is represented by a series of short samples as distinct from a continuous view, and the moving object is in rotational or other cyclic motion at a rate close to the sampling rate. It also accounts for the "wagon-wheel effect", so-called because in video or film, spoked wheels on horse-drawn wagons sometimes appear to be turning backwards. Depending on the frequency of flash, the element appears motionless or rotating in reverse direction.<br> <img src="%ATTACHURLPATH%/Strobe_2.gif" alt="Strobe_2.gif" width="180" height="60" /> (Source https://en.wikipedia.org/wiki/Stroboscopic_effect) %DASHBOARD{ section="box_end" }% %DASHBOARD{ section="dashboard_end" }% -- %USERSIG{PeterSchmid - 2014-11-04}% <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-sa/4.0/88x31.png" /></a><br /><span xmlns:dct="http://purl.org/dc/terms/" property="dct:title">Velo Bling-Bling</span> by <a xmlns:cc="http://creativecommons.org/ns#" href="http://veloblingbling.ch" property="cc:attributionName" rel="cc:attributionURL">Peter Schmid</a> is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">Creative Commons Attribution-ShareAlike 4.0 International License</a>.
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2016-03-27 - 21:30
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Topic revision: r3 - 2016-03-28
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PeterSchmid
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