The design of flow meter is according to the sensor probe inserted into the pipe and just touching the fluid. Fluid shear stress on the top of sensor probe is in direct proportion to the volume of fluid flow. As shown in Fig.1, Fig.2 is detector probe’s magnification of Fig.1 In these two figure

A good piezoelectric buzzer, if not used correctly, it is very easy to bad,How to correctly use the piezoelectric buzzer? Should pay attention to the following points

Buzzer drive mode can be divided into External drive and self dirve

The electronic buzzer is an integrated structure sounder, divided into piezoelectric buzzer and electromagnetic buzzer two types.

SWT ultrasonic distance measuring sensor, uses the ultrasonic echo ranging principle, using the precise time difference measurement technique