Description VAMeter is a professional, programmable, high-precision power meter designed for accurate voltage and current measurement. Powered by the Stamp-S3 module, it features Wi-Fi connectivity and two cascaded INA226 current/voltage sensing circuits. The device supports current detection resolutions of 2.5 µA and 250 µA, with a measurement range of 0-5A and 5-24V, or 1-24V in isolation mode. It supports flexible power supply through the USB-C port or the Base terminal, and includes built-in power and signal isolation. A slide switch allows users to choose between isolated measurement powered via USB and non-isolated measurement powered directly from the test source. The included expansion BASE provides relay on/off control and a Grove port for secondary development. VAMeter also supports OTA firmware upgrades and USB MSC/OTG, allowing users to view and edit data and configuration files stored in the main controller file system from a PC. M5Stack provides an online data API for uploading test data to EZData for remote access and visualization. Features High-precision current detection with 2.5 µA / 250 µA resolution switching Wide voltage input: 5-24V Cloud data display via EZData PD input, no PD trigger built in Multiple power-supply methods: PD INPUT, Stamp-S3, and external terminal block Power and signal isolation USB MSC/OTG support Open-source hardware and software Wireless OTA upgrade Expansion BASE with relay on/off control and Grove port Specifications Specification Parameter SoC ESP32S3FN8, Xtensa 32-bit LX7 dual-core processor, 240MHz Power Detection Chip INA226 Flash 8MB Wi-Fi 2.4GHz Wi-Fi INA226 Communication Address Dual INA226 detection chips: 0x40 / 0x41 Display 1.3 inch, 240 x 240 pixels Display Driver ST7789 PD Input Power 5-24V @ 0-5A Current Resolution 2.5 µA / 250 µA Current Sampling Error Small current (1-100mA): 1.01%; large current (100mA-5A): 0.94%; µA-level current: 0.69% Voltage Error Measurement error: 0.11% Power Consumption Stamp-S3 USB powered: DC 5V / 123.5mA; PD INPUT: DC 5V / 118mA, DC 12V / 66.8mA, DC 24V / 26mA PD Output Capability DC 24V @ 3A 68°C; DC 24V @ 5A 92°C User Interface Rotary encoder switch, reset button, boot button, onboard buzzer Relay DC 5-24V @ 5A Operating Temperature 0-40°C Product Size 51.5 x 48.0 x 40.5mm Product Weight 43.4g Package Size 160.9 x 93.0 x 31.6mm Gross Weight 68.4g Interface USB-C port for power, USB MSC/OTG, and configuration access Base terminal for external power supply Slide switch for isolated and non-isolated measurement mode selection Rotary encoder switch for user operation Reset button and boot button Onboard buzzer Grove port on the expansion BASE for secondary development Relay on/off control through the expansion BASE Development Platform UiFlow2 Arduino IDE ESP-IDF PlatformIO Applications Industrial automation Equipment monitoring Power testing and analysis IoT devices Remote monitoring and data acquisition Product List 1 x VAMeter 1 x VAMeter Base 2 x 3.81-2P Terminal Block 4 x Hanger (Small) Model Size Resources Official Documentation VAMeter Usage Example VAMeter Factory Firmware VAMeter Schematics PDF VAMeter Base Schematics PDF INA226 Datasheet VAMeter Firmware EasyLoader FAQ What is VAMeter used for? VAMeter is used for high-precision voltage and current measurement, power testing, equipment monitoring, and remote data acquisition. What current resolution does it support? It supports 2.5 µA and 250 µA current resolution switching. What voltage range does it measure? It supports 5-24V measurement, and 1-24V in isolation mode. Does it support wireless data display? Yes. It supports Wi-Fi and can upload test data to EZData for remote access and visualization. Which development platforms are supported? It supports UiFlow2, Arduino IDE, ESP-IDF, and PlatformIO. What is included in the package? The package includes VAMeter, VAMeter Base, two 3.81-2P terminal blocks, and four small hangers.
Related
Related
Related
Related