Rotating Sprocket Wheel Generator

Posted on Jul 2, 2012

The 16F84 has 13 outputs. All 13 can serve as inputs, but only 12 are normal outputs, one is an open-drain. An open-drain output has no active pull up- you have to provide an external (passive) pull up. Since the `F84 is CMOS based, this leaves us 12 outputs that have good, low impedance 1`s or 0`s. We want two channels, 12/2 = 6 bits/channel. Using the rough approximation of 6 dB/bit, 6 bits/channel * 6 dB/bit gives us approximately 36 dB/channel of dynamic range.

Rotating Sprocket Wheel Generator
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