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tornado/doc/README: calculate image size
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@ -54,3 +54,13 @@ test firmware. CH2 (blue) is signal entering the first LED module,
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CH1 (yellow) is the signal exiting the last module. The absence of
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degradation in a 250 ns pulse suggests that we can go as fast as the
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MCU is able to.
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Image size
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----------
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With a radius of 80 cm the circumference is roughly 5000 mm.
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In order to obtain square pixels at the outer radius, we therefore
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need 1000 lines per rotation, irrespective of speed. Each line
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consists of 64 pixels or 8 bytes of data. Therefore, the full disc
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needs roughly 8 kB of data while a quarter disc needs 2 kB.
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