https://www.electrodragon.com/product/water-turbidity-sensor/
Sensor default out analog value 0~4.5V Digital output or amplified output by LM358-DAT
jumper select:
- D: LM3528 channel 1 as comprator
- digital threashold output, LED on
- tuning on-board trim-pot for the threashold.
- D': LM3528 channel 1 as amplifier
- you can use arduino analog read data, normal aroun 65x, block at 5-10
note
- few boards' LED may not work, but the rest functions work well