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tornado/doc/README: calculate image size

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Werner Almesberger 2012-12-19 14:11:42 -03:00
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tornado/doc/README
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@ -54,3 +54,13 @@ test firmware. CH2 (blue) is signal entering the first LED module,
CH1 (yellow) is the signal exiting the last module. The absence of
degradation in a 250 ns pulse suggests that we can go as fast as the
MCU is able to.
Image size
----------
With a radius of 80 cm the circumference is roughly 5000 mm.
In order to obtain square pixels at the outer radius, we therefore
need 1000 lines per rotation, irrespective of speed. Each line
consists of 64 pixels or 8 bytes of data. Therefore, the full disc
needs roughly 8 kB of data while a quarter disc needs 2 kB.