Makefile需要将ARDUINO_PATH改到自己的arduino路径，新版的好像都没有mksketch，我用的proteus自带的编译。 5.在buzzer目录下cmd指令node main运行js文件，js会先mp3转码成pcm输出到sound目录， 在经过串口输出到arduino。（js里面的串口号也要改成自己的，波特率不要改） ...

Piezoelectric buzzers or simply piezo buzzers are used mainly in alarm circuits to serve as a beeping or security alerting device ... If we look at lines 10 to 98 - those are the defined notes with ...

His binary clock uses an Arduino Duemilanove (which fits perfectly ... A small piezo speaker serves as the alarm buzzer, which should be sufficient to wake up most people, though something bigger ...

It runs on mains power and uses a 100dB piezo buzzer for ear ... If the Arduino loses sight of the DHT22 temperature sensor inside the freezer, then the alarm sounds continuously.