In order to improve positioning precision of time grating indexing turntable further and reduce response time of the system

research and fabricate servo turntable control system based on μC / OS-Ⅱ. The system uses STM32F4 with digital signal processing（ DSP） control instruction set as microprocessor

apply single-neuron PID control algorithm

use servo motor as drive device

use high-precision time grating angular displacement sensor as turntable grid position detection unit which constitute a closed-loop control system

so as to achieve precise indexing. Experimental results confirm that the system responses fast and the indexing precision reaches ± 2″

it shows that this scheme is feasible.