arduino 測量水流速

https://read01.com/zh-tw/xg6G48.html#.XMB_cuQlFpU

https://blog.csdn.net/song527730241/article/details/51134585

PlayRobot
https://www.playrobot.com/timing-counts/1660-fluid-flow-sensor-g12.html

掏寶
https://world.taobao.com/item/14387101429.htm