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Reverse engineering a flip dot sign

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Published on Apr 21, 2010

Here's a little demonstration about how to control a flip-dot sign. These mechanical display devices were common before LED displays took off, and this device in particular is surplus from a city bus. Curiously, this one actually has LEDs on it to light the sign, however the physical dots probably provide a much higher contrast ratio, allowing the sign to be viewed in the daytime.

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