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Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

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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.

== Summary ==
This is a 4-channel measurement module that reads per-channel current, voltage and power via I2C/SMBus. It uses an onboard 0.1-ohm shunt resistor and a 12-bit ADC.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL17539 WSAL17539 – 4-ch Current/Voltage/Power Monitor HAT for Raspberry Pi, I2C/SMBus]

== Technical overview ==
* Uses the standard Raspberry Pi 40-pin GPIO expansion header and fits all Pi boards.
* Four measurement channels, each with INx+ (input) and INx- (output); bidirectional current flow is possible.
* Current range ±3.2 A; resolution 0.8 mA in the large range or 0.1 mA in the small range (±400 mA).
* Voltage range 0–26 V; operating voltage 3.3 V or 5 V.
* Additional multiply register calculates power directly from current and voltage data.
* Housing dimensions 65 × 30 mm, hole diameter 3.0 mm.
* Connection to the Raspberry Pi is via the GPIO header or by wires to the I2C bus.
* Example files are available for Raspberry Pi (Python), STM32 (Keil) and Arduino.
* When using different power adapters, GND must be connected, otherwise the VBus voltage will not be measured.
* The module type is based on the INA219 chip and is designed exclusively for DC.

'''Commands and examples – verify before use:'''
<syntaxhighlight lang="text">
sudo raspi-config
sudo reboot
sudo apt-get install p7zip
wget https://files.waveshare.com/upload/6/69/Current-Power_Monitor_HAT_Code.7z
7zr x Current-Power_Monitor_HAT_Code.7z -r -o./Current-Power_Monitor_HAT
cd Current-Power_Monitor_HAT/RaspberryPi
python3 ina219.py
</syntaxhighlight>

== Notes and version constraints ==
* The source contains unresolved placeholders ({{{name2}}} through {{{name6}}}, {{{userDefinedInfo}}}, {{{userdefinedvalue}}}, {{{3}}}, {{{4}}}, {{{5}}); these values must be verified before use.
* On Bullseye-based systems, “apt-get” must be replaced with “apt”; only Python 3 is supported.
* The module’s I2C address cannot be changed; therefore multiple modules cannot simply be stacked.
* The device is not suitable for AC current (DC only).
* The exact operation of the multiply registers and the specific register addresses are not fully documented in the source; manual verification is required.

== Source and revision record ==
* [https://www.waveshare.com/wiki/Current/Power_Monitor_HAT Current/Power Monitor HAT - Waveshare Wiki]
* Source revision: 79223
* Captured: 2026-08-31T04:22:38+00:00
* SHA-256: <code>6a1467b262a6c5874e7258aeaebc131c4a849e0a4e7beb41b76ab72d32876efa</code>

WSAL17539 – Current – Power Monitor HAT/en - Versionsgeschichte

JWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex