# Soil Four Parameter Sensor Code Help

**URL:** <https://forum.arduino.cc/t/soil-four-parameter-sensor-code-help/1326054>\
**Category:** Sensors\
**Created:** [November 26, 2024, 1:32pm UTC](https://forum.arduino.cc/t/soil-four-parameter-sensor-code-help/1326054 "2024-11-26T13:32:36Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![palmmy88](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/palmmy88/32/1103287_2.png) [@palmmy88](https://forum.arduino.cc/u/palmmy88)\
**Post date:** [November 26, 2024, 1:32pm UTC](https://forum.arduino.cc/t/soil-four-parameter-sensor-code-help/1326054/1 "2024-11-26T13:32:36Z")

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Pls help me write code from this datasheet, I want to use just Temp Humidity and pH.

 ![image](https://europe1.discourse-cdn.com/arduino/original/4X/7/6/f/76f801af5a4389606f06e4b5614a20354ece7a41.png)  
 ![image](https://europe1.discourse-cdn.com/arduino/original/4X/3/c/6/3c6385703f7e16e0bd7c94800c01f99a37067fe5.png)  
 ![image](https://europe1.discourse-cdn.com/arduino/original/4X/3/0/e/30e83f1fa6b98131a45039740f9b4d0ca3c72eb8.png)

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**Author:** ![palmmy88](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/palmmy88/32/1103287_2.png) [@palmmy88](https://forum.arduino.cc/u/palmmy88)\
**Post date:** [November 26, 2024, 1:33pm UTC](https://forum.arduino.cc/t/soil-four-parameter-sensor-code-help/1326054/2 "2024-11-26T13:33:06Z")

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![image](https://europe1.discourse-cdn.com/arduino/original/4X/9/0/d/90d2efa58be023680c7f91422d49e8262b42d40e.png)

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**Author:** ![markd833](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/markd833/32/1186928_2.png) [@markd833](https://forum.arduino.cc/u/markd833)\
**Post date:** [November 26, 2024, 1:35pm UTC](https://forum.arduino.cc/t/soil-four-parameter-sensor-code-help/1326054/3 "2024-11-26T13:35:04Z")

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From the limited information you have provided, I'm assuming that you have one of those 3 (or 5) prong NPK sensors that uses modbus over RS485 to communicate with it.

Search the forums for NPK Sensor and you should find code to get you started.

You might want to tell us which Arduino you are using.

Also note that the general forum opinion is that those NPK sensors don't do what they claim to do - assuming of course that is what you have.

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**Author:** ![xfpd](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/xfpd/32/1120236_2.png) [@xfpd](https://forum.arduino.cc/u/xfpd)\
**Post date:** [November 26, 2024, 5:28pm UTC](https://forum.arduino.cc/t/soil-four-parameter-sensor-code-help/1326054/4 "2024-11-26T17:28:57Z")

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Here are two thorough, similar, procedures for using registers on an NPK sensor. The second link has very complete comments in the code, but uses another serial library.

> **[In-Depth: Interfacing Soil NPK Sensor with Arduino](https://lastminuteengineers.com/soil-npk-sensor-arduino-tutorial/)**
>
> Learn to interface JXCT Soil NPK sensor with Arduino along with Pinout, Wiring, Usage, Modbus RTU requests for reading NPK levels and Arduino Code.

> **[Measure Soil NPK values using Soil NPK Sensor with Arduino – Circuit Schools](https://www.circuitschools.com/measure-soil-npk-values-using-soil-npk-sensor-with-arduino/)**

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**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\
**Post date:** [May 25, 2025, 5:29pm UTC](https://forum.arduino.cc/t/soil-four-parameter-sensor-code-help/1326054/5 "2025-05-25T17:29:32Z")

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