1, voltage sampling and alarm system basic requirements: based on a single-chip microcomputer test board design can measure to the analog voltage and the voltage value on the digital tube display system. Extension requirements: by setting the button to adjust an alarm the upper and lower limits of voltage, when the voltage being measured by transfinite alarm buzzer given after more than limit, can at the same time cooperate with digital tube display content on the blink. Design tip: AD converter using eight bits serial eight AD board, analog voltage change by adjusting the adjustable potentiometer VR1 to gain

第一题
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