介绍利用干簧管阵列,通过类似键盘扫描方式检测干簧管接点位置,开发了一种集LCD 显示、RS2485通信及4~20 mA 输出廉价的小量程液位传感器。 关键词:液位传感器;干簧管;AD421
Abstract :A low2cost and small2scale liquid level sensor with a LCD display ,a RS2485 communication interface and a 4~ 20 mA current output is successfully developed by a method similar to keybord scanning of using an array of contacts of tongue tube. Key words :liquid level sensor ;tongue tube ;AD421