Turbidity sensors is the use of optics , through the liquid solution and scattering rate of transmittance integrated to determine the turbidity case , since the amount of haze value is gradual , usually detected in a dynamic environment , the turbidity sensor acquisition value , the need for external control for AD conversion , the conversion to obtain the corresponding environment turbidity situation, so that the sensor can also need to produce a peripheral circuit detected in the system , with a waterproof probe , mainly used in washing machines, dishwashers and other equipment turbidity testing can also be used on electronic design, graduate design, electronic competition experiments and other applications.