This document describes an angle measuring device that uses gray code and consists of 8 LEDs, 8 photoelements, and a circular wheel with gray code printed on it to measure absolute angle without needing initialization after powering down. Light passing through the wheel represents a 1 and no light a 0, which is converted from gray code to binary by a circuit with ICs on the same board as the LEDs. The decoded signals are then sent to a microcontroller, PC, or other device to display or process the angle measurements.
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1. Gray code comes handy when measuring absolute angle. In case of power-down no
initialization is needed. So how to make this device?
This measuring device consist of 8 LEDs and 8 fotoelements. Between LED and
fotoelement we put circle with gray code on it. When light goes through the
wheel - this meens logic "1", and if light do not come through - this meens a
logic "0". Circuit with ICs implemented on the same board with LEDs takes care
of conversion from Gray to binary.
Schematic of Angle decoder. The best solution is to take the decoded signals to
microcontroler or PC, display and/or process data.