4-Channel Current Voltage Power Monitor HAT for Raspberry Pi, I2C/SMBus Communication Interface, Multi-Channel Power Consumption Detection Expansion Board

4-Ch Current/Voltage/Power Monitor HAT is a professional power consumption detection expansion module specially designed for Raspberry Pi single-board computers. It adopts the official standard HAT stacking structure, which can be directly mounted on the 40PIN GPIO pin header of Raspberry Pi, perfectly compatible with Raspberry Pi Zero, Zero W, 3B, 3B+, 4B and other full series main controllers without extra wiring transformation.

The module supports 4 groups of completely independent circuit detection, which can separately collect the operating parameters of 4 different loads at the same time. It communicates with the host through universal I2C and SMBus interfaces, with strong anti-interference performance and long-distance stable signal output. Equipped with onboard 0.1 1% high-precision sampling resistors and embedded 12-bit successive approximation ADC, it supports 0-26V wide voltage input range and bidirectional current measurement up to ±3.2A, the built-in arithmetic register can automatically calculate and output the real-time power value of each channel, greatly simplifying program calculation work.

Green screw terminal blocks are reserved on the board for quick and secure wiring of test circuits, avoiding loose wire contact during long-term operation. The PCB is designed with reserved I2C expansion pins, allowing multiple identical HAT modules to be cascaded for more multi-channel power monitoring expansion. The overall size is compact at 65mm × 30mm, with fixed mounting holes for easy installation inside embedded chassis and equipment shells.

Full set of technical documents and sample program resources are provided, including Python test scripts for Raspberry Pi, as well as driver examples for Arduino and STM32 microcontrollers, lowering the threshold for project development. Widely applied in embedded equipment power consumption statistics, battery discharge curve testing, IoT sensor power monitoring, DIY UPS power supply detection, industrial small circuit fault diagnosis and student electronic competition experimental projects.