chu-Test1的详细介绍
创作者：chudongyu | 更新日期：2016-03-13 | 在线时长：0秒
arduino with a beeper
创作者：chudongyu | 更新日期：2016-03-13 | 在线时长：0秒
arduino with a beeper
Read the arduino anolog Pin A0
arduino, esp8266
nothing is connected to PinA0, so the value is the floating voltage.
if you send command "play" to it, the beeper will be turned on;
if you send command "stop" to it, the beeper will be turned off.