Whirlpool Turbidity Sensor

In the course of one of our Makership Projects, we needed a water turbidity sensor.  Of course a new sensor was prohibitively expensive, but eBay pointed us towards inexpensive dishwasher sensors.  We ended up purchasing a Whirlpool Turbidity Sensor, part number 99002650

Pin 1 -> Thermistor

Pin 2 -> Turbidity (photoresistor)

Pin 3 -> Photodiode

Pin 4 -> +5V Power Supply

To use this sensor with an Arduino:

Tie pin 1 to an analog input, and connect that pin via a 10K pull down (to ground) resistor

Tie pin 2 to an analog input, and connect that pin via a 3K pull down (to ground) resistor

Tie pin 3 to ground with a 150ohm resistor

Tie pin 4 directly to 5V power

We weren’t able to find much pinout information online so we thought we’d document this somewhere in the hopes of helping someone else.

 

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