Design a test circuit high and low signal, the following functions: 1. Measuring range: low UL <0.5V, high level> 5V. 2. Treble represented by the measured signal is high. 3. With bass indicates the measured signal is low. 4. When between 0.5V ~ 5V when the signal is not audible.

电平测试
........\ADC.h
........\API.h
........\API._h
........\dianping_cs.c
........\DIANPING_CS.cof
........\DIANPING_CS.dbg
........\dianping_cs.dp2
........\DIANPING_CS.hex
........\dianping_cs.lis
........\DIANPING_CS.lk
........\DIANPING_CS.lst
........\DIANPING_CS.mak
........\DIANPING_CS.mp
........\dianping_cs.o
........\dianping_cs.prj
........\dianping_cs.s
........\DIANPING_CS.SRC
........\dianping_cs._c
........\timer_init.h
........\timer_init._h

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