Water Level Measurement Device

Abstract

In order to detect water level information accurately, a new sensing technology based on capacitance sensing principle is adopted. A long rectangle metal sheet is inserted into the water. When the water level changes, the parasitic capacitance of the metal sheet will change. using the high precision and digital capacitive sensor FDC2214 senses this slight change and converts it into a digital output of up to 28 bits, data are sampled by the IIC interface, connected it to the high-performance microprocessor STM32, STM32 can efficiently sample and process these data. In programming the software, a multitude of data are sampled each time, and mean filtering algorithm is adopted to eliminate the interference, finally, we accurately acquire the information of water level. The experimental results show that this method can quickly detect the level of the water, the accuracy of measurement is closed to 1 mm.