This the source code for a work of an electronic design contest preliminaries. Chip microcontroller the AT89C52, C language. Role of the test input of the low-frequency AC signal, can measure the range of from 1Hz to 60kHz, the maximum of 5V peak-to-peak square wave signal. Hardware, the channel is the analog switch chip select different magnifications.

Low Frequecy signal measurement.c

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