Abstract: When design household intelligent washing machine, the accuracy of water level detection in washing machine barrel is very important. The accuracy of water level is directly reflected in the washing ratio, energy efficiency, user experience and so on. Traditional water level sensors are two-wire or three-wire, and the detection accuracy can only reach about 10% due to the influence of line length, temperature and anti-interference performance, which leads to a large error in judging the height of water level in the washing machine, which is not conducive to the intelligent control of the washing machine. Introduces an integrated digital pressure sensor for water level detection, which can greatly improve the accuracy of water level detection, effectively ensure the water level error within a controllable range, and ensure the energy efficiency, washing ratio and user experience of the washing machine.

Key words: Automatic control, Pressure sensor, Water level detection