Design of automatic light-adjusting system based on TMS320F2812 controller

In order to satisfy the need of acquiring clear image in area CCD aerial camera, an automatic light adjustment control system based on digital signal processer TMS320F2812 as the core light adjustment controller was designed. The control system consisted of programmable logic device EPM7128 worked as logic operation and electric level conversion, integrated photodiode and amplifier OPT301M worked as detective light device, A/D converter AD7865 which converted analog signal to digital signal, direct circuit motor which controlled curtain type shutter speed, photoelectric encode which fed back speed signal, program code which realized automatic light adjustment arithmetic and control. The experiment results show：with the input step signal of 180r/min, the adjustable time is 0.095s, speed error 1.08r/min, which meets the need of system.