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'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.<br />
<br />
== Summary ==<br />
The Waveshare Moisture Sensor (P/N 9527 / WSAL9527) is a fork-shaped soil sensor with an analog output that measures soil moisture via transistor current amplification.<br />
<br />
== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/9527 9527 – Moisture Sensor]<br />
* [https://shop.jw-tech.eu/p/WSAL9527 WSAL9527 – Moisture Sensor]<br />
<br />
== Technical overview ==<br />
* Fork design for insertion into soil; the output voltage rises as soil moisture increases.<br />
* Specifications: detection depth 38 mm, power 2.0–5.0 V, dimensions 20.0 × 51.0 mm, mounting holes 2.0 mm.<br />
* Pinout: VCC (2.0–5.0 V), GND, AOUT (analog data output).<br />
* Operating principle: moist-soil conduction switches the base-emitter path of a transistor; collector current is converted to a voltage across a resistor for the ADC.<br />
* Raspberry Pi Pico: MicroPython and C examples are provided; the matching firmware must be flashed to the Pico before use.<br />
* Pico wiring: VCC → 3.3 V, GND → GND, AOUT → GP26 (ADC channel).<br />
* STM32 examples target STM32F103RBT6 or STM32H743; the shown connection uses PA6 for AOUT at 3.3 V.<br />
* Arduino example targets the UNO: VCC → 5 V, GND → GND, AOUT → A0.<br />
* Expected behavior: when the probe is inserted into soil and water is gradually added, the serial output value changes accordingly.<br />
* FAQ note: if the output stays constant, the threshold voltage may be set too high; adjust it to an appropriate value.<br />
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'''Commands and examples – verify before use:''' <br />
<syntaxhighlight lang="text"><br />
sudo apt-get install p7zip-full<br />
cd ~<br />
sudo wget https://files.waveshare.com/upload/5/59/Moisture-Sensor-code.7z<br />
7z x Moisture-Sensor-code.7z -o./Moisture-Sensor-code<br />
cd ~/Moisture-Sensor-code/Pico/c/build/<br />
export PICO_SDK_PATH=../../pico-sdk<br />
cmake ..<br />
make -j9<br />
cp main.uf2 /media/pi/RPI-RP2/<br />
</syntaxhighlight><br />
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== Notes and version constraints ==<br />
* The Pico firmware version (e.g., rp2-pico-20210418-v1.15.uf2) is version-sensitive; verify that the firmware matches the sample code before flashing.<br />
* The STM32 example assumes the HAL library and Keil; porting to other STM32 boards requires custom adaptation.<br />
* The Arduino example is tailored to the UNO; compatibility with other Arduino boards must be verified separately.<br />
* If the reading is constant: adjust the threshold voltage in the code, then recompile/re-flash.<br />
* The source provides no certification, warranty, or safety-classification information; such claims are not supported here.<br />
<br />
== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/Moisture_Sensor Moisture Sensor - Waveshare Wiki]<br />
* Source revision: 68933<br />
* Captured: 2026-08-29T09:37:52+00:00<br />
* SHA-256: <code>7356ccfbfb51727f9e2986e6d299575793332ff4f51350a370c87e4489e0b1b8</code></div>JWTechPublisher