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Etch-servo drives two servo motors using a simple parallel-port-attached circuit. 'pwmgen' produces an enable waveform to turn the servo motors at a variable speed, and 'encoder' reads TTL-level quadrature inputs to close the loop.
The circuit uses an L298 dual full-bridge driver to control two servo motors.
More information on the circuit is available:
http://emergent.unpy.net/projects/01142347802
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