1. Turbidity Sensor How The Sensor Works: When Light Passes Through A Certain Amount Of Water, The Amount Of Light Transmitted Depends On The Amount Of Dirt In The Water. As The Amount Of Dirt Increases, The Amount Of Light Penetrating The Water Sample Decreases, And A Turbidity Sensor Measures The Amount Of Light Transmitted To Calculate The Turbidity Of The Wash Water. 2. The Turbidity Sensor Provides These Turbidity Measurements To The Washing Machine Or Dishwasher Controller, Which Determines The Time Of Each Wash Cycle. These Judgments Are Based On A Comparison Of The Purified Water Measurement (Measured At The Beginning Of The Wash Cycle) And The Wash Water Measurement At The End Of The Wash. 3. By Measuring The Turbidity Of The Wash Water, The Washing Machine Can Only Wash Less Dirty Clothes For The Time Required, Thereby Saving Energy And Allowing The End User To Save Energy. 4. The Small Breakout Lm358 Is Used To Amplify The Analog Input Signal And Adjust The Onboard Trimmer Potentiometer For Amplification. Two Leds On Board, Red Power Status, Green Digital Output Status Led (Not Very Bright) 5. Default Analog Value Output, Switch The Jumper To Digital Output. Adjust The On-Board Potentiometer To Change The Analog Threshold. Sensor Default Output Analog Value:0-4.5V Model:Water Detection Sensor Module Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Colour:As Shown Material:PCB+Plastic Size:Cord Length:About 20cm Package Contents: 1 * Turbid Water Detection Module 1 * Turbidity Sensor 1 * Wire Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.