# Water turbidity sensor: specs

> Optical turbidity probe with an amplifier board that gives an analog voltage, and a digital high/low output with an adjustable threshold. Every spec…

[HTML version](https://soldr.ai/docs/components/turbidity-sensor)

[Docs](https://soldr.ai/docs) / [Components](https://soldr.ai/docs/components)

Optical turbidity probe with an amplifier board that gives an analog voltage, and a digital high/low output with an adjustable threshold. Every spec below is from the original maker's SEN0189 wiki, a reference board: the stocked board is not confirmed to be that board, so its supply, output range and digital output are not confirmed.

Every value cites its sourcePinout not published

[Buy on Compoden](https://compoden.com/products/water-turbidity-sensor-with-analog-module-ntu-measurement)

## Specs

| Spec | Value | Source |
|---|---|---|
| the original maker's SEN0189 reference board: Operating voltage | 5 V DC | source Specification table (wiki page for SEN0189) |
| the original maker's SEN0189 reference board: Operating current | 40 mA max | source Specification table (wiki page for SEN0189) |
| the original maker's SEN0189 reference board: Response time | under 500 ms | source Specification table (wiki page for SEN0189) |
| the original maker's SEN0189 reference board: Insulation resistance | 100 Mohm min | source Specification table (wiki page for SEN0189) |
| the original maker's SEN0189 reference board: Analog output | 0 to 4.5 V | source Specification table (wiki page for SEN0189) |
| the original maker's SEN0189 reference board: Digital output | High/Low level; threshold adjustable with the potentiometer | source Specification table (wiki page for SEN0189) |
| the original maker's SEN0189 reference board: Operating temperature | 5 C to 90 C | source Specification table (wiki page for SEN0189) |
| the original maker's SEN0189 reference board: Storage temperature | -10 C to 90 C | source Specification table (wiki page for SEN0189) |
| the original maker's SEN0189 reference board: Weight | 30 g | source Specification table (wiki page for SEN0189) |

## Power

| | Value | Source |
|---|---|---|
| Supply | the original maker's SEN0189 reference board: 5 V DC (stocked board's supply not confirmed) | source Specification table |
| Current | the original maker's SEN0189 reference board: 40 mA max (stocked board not confirmed) | source Specification table |

## Pinout
We don't publish a pin table for this part: no official source we could verify gives one. Check the labels printed on your module, and see the notes below.

The the original maker's wiki is used as the reference for this module type. The pin labels of the board you receive are not confirmed by a document, so read the markings printed on it.

## Build with it
Project ideas for the Water turbidity sensor. Each link opens Soldr with the prompt filled in; Soldr assigns the pins, checks power and shows how to wire every part.

- [Water clarity display](https://app.soldr.ai/?prompt=I%20want%20to%20build%20a%20water%20clarity%20display%20with%20an%20Arduino%20Uno%2C%20a%20turbidity%20sensor%20module%20and%20a%2016x2%20I2C%20LCD): On the original maker's reference board the supply is 5 V and the analog output runs to 4.5 V, which an Uno input accepts; measure the output of the board you received before relying on that. Relative readings only; not a drinking-water test. Learning project.
- [Finer-resolution turbidity reading](https://app.soldr.ai/?prompt=I%20want%20to%20build%20a%20turbidity%20reader%20with%20an%20Arduino%20Uno%2C%20a%20turbidity%20sensor%20module%2C%20an%20ADS1115%20converter%20and%20an%20OLED%20display): On the reference board the output reaches 4.5 V, so power the converter at 5 V to keep it within its supply; measure the output of the board you received before connecting it to the converter. Learning project.
- [Aquarium clarity log](https://app.soldr.ai/?prompt=I%20want%20to%20build%20a%20turbidity%20logger%20with%20an%20Arduino%20Uno%2C%20a%20turbidity%20sensor%20module%2C%20a%20real%20time%20clock%20and%20a%20microSD%20card%20reader): Logs a time-stamped reading to compare water clarity over days. Learning project.

## Common mistakes

- Feeding the analog output straight into a 3.3 V ADC pin: the analog output runs to 4.5 V and the supply is 5 V ([source](https://wiki.dfrobot.com/sen0189/))
- Using it as a calibrated NTU meter: the fetched wiki page lists no voltage-to-NTU table, so readings are only relative until you calibrate against a known standard ([source](https://wiki.dfrobot.com/sen0189/))
- Running it outside 5 C to 90 C: the stated operating range is 5 C to 90 C ([source](https://wiki.dfrobot.com/sen0189/))

## Not covered by the official source

- Listing product is not confirmed identical to the original maker's SEN0189; values are that board's published specification.
- The the original maker's wiki gives no pin table or voltage-to-NTU curve; both are omitted.
- Probe waterproof depth and probe cable length are not stated.
- No voltage-to-NTU table is published for this board, so readings are relative until you calibrate.

## Sources

- [link](https://wiki.dfrobot.com/sen0189/) (the original maker's wiki, Gravity: Analog Turbidity Sensor for Arduino, SEN0189; maker page, retrieved 2026-11-07)