Description: Sound is produced by the vibration, a certain frequency vibration to generate a certain frequency of sound. This experiment is ticking speaker, a long, one short of the alarm sound, send the port is p1.2 (ie D2) output as 1khz, 2khz, 3khz frequency signal alarm, not the same as the sound frequency is not the same. R54 for 10 euro to 100 ohm resistor. Purpose: By setting different delay time (delay time is not not the same as the corresponding frequency) will issue fixed buzzer sound. To understand the microcontroller peripherals using digital control methods.
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蜂鸣器报警器试验.ASM
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