FPGA Based Quadrature Decoder/Counter with I2C Bus Interface For Motor Control

This paper presents a new solution for processing the pulses from an optical encoder attached to a motor shaft, and deriving the rotational speed information The measurement accuracy at low speeds using the proposed method is improved, compared to currently known methods. Another significant advantage of using the proposed circuit is that it can be implemented in specific hardware, thus, reserving the full computational power of the controlling micro controllers for high-level control tasks and for future software expansions.