K136 M5Stack voltage and current meter with M5StampS3

VA Meter is a professional, programmable, high-precision power meter for accurate voltage and current measurements. This product is based on the M5StampS3 main control module and supports WiFi functionality. It has two INA226 current and voltage measurement circuits connected in series, providing a current detection resolution of 2.5uA and 250uA, and supports a measurement range of 0-5A and 5-24V (1-24V in isolation mode). The product can be powered via a USB-C interface or a base terminal input and has built-in current and signal isolation. Users can choose between isolated measurement via USB power supply or non-isolated measurement with direct power supply via a toggle switch to meet different application requirements. The associated BASE extension includes a relay on/off control and a Grove connection for secondary development.

In addition, the device supports OTA firmware upgrades and USB MSC/OTG functionality, which allows the user to edit and view data and configuration files stored in the main control file system on a PC. The M5 also offers a free online data API interface that allows users to upload test data to the EZData platform for remote retrieval and browsing, greatly simplifying IoT application development. The VA Meter is a versatile and developer-friendly instrument that is ideal for engineering projects that require precise current and voltage measurements, as well as areas such as industrial automation, device monitoring and smart grids.

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