M5Stack VA Meter with Voltage and Current Measurement

The M5 Stack VA Meter is a professional, programmable high-precision power meter designed for accurate voltage and current measurement. It is based on the M5StampS3 main control module and supports WiFi functionality. The device features two series-connected INA226 current and voltage measurement circuits that provide a current detection resolution of 2.5uA and 250uA and support a measurement range of 0-5A and 5-24V (1-24V in isolation mode). It can be powered via a USB-C interface or the base input and includes built-in power and signal isolation. Users can choose between isolated measurement via USB power or non-isolated measurement with direct power supply via a toggle switch. The included expansion BASE includes relay on/off control and a Grove port for secondary development. Additionally, the device supports OTA firmware upgrades and USB MSC/OTG functionality, allowing users to edit and view data and configuration files stored in the main control system on a PC. M5 also offers a free online data API interface, allowing users to upload test data to the EZData platform and access it remotely, significantly simplifying the development of IoT applications. The VA Meter is a versatile and developer-friendly instrument, ideal for engineering projects requiring precise current and voltage measurements, as well as for fields such as industrial automation, equipment monitoring, and smart grids.

Recommended Accessories:

• USB-C Magnetic Charging Data Cable Angled 1m

Features: 

• The VA Meter offers high-precision current detection with a resolution of 2.5uA/250uA.
• It supports a wide voltage input range of 5-24V.
• The device allows real-time data display via the EZData Cloud.
• It offers multiple power supply modes, including PD Input, StampS3, and external terminal.
• The power supply is isolated from the signal to ensure accuracy and safety.
• OTA upgrades are supported to keep the device up to date.

Application Examples:

• Industrial automation for machine monitoring
• Monitoring of equipment for energy consumption analysis
• Use in smart grids for voltage and current measurement
• Development of IoT devices for remote monitoring
• Use in smart home applications for energy management

Documentation: 

• M5Stack Wiki
• Official M5Stack Forum

Technical Specifications: 

• Manufacturer: M5Stack 
• Manufacturer SKU: K136 
• Current detection chip: INA226
• SoC: ESP32S3FN8@Xtensa® 32-bit LX7 dual-core processor up to 240 MHz
• Flash memory: 8MB
• Wi-Fi: IEEE 802.11 b/g/n (2.4 GHz Wi-Fi)
• Screen: 1.3-inch 240*240 pixels
• Screen driver: ST7789
• PD input power: 5-24V, 0-5A
• Current detection resolution: 2.5uA/250uA
• Current sampling error: 1-100mA: 1.01%, 100mA-5A: 0.94%, uA level: 0.69%
• Power consumption (factory setting): 
• USB: DC5V/123.5mA 
• PD input: DC5V/118mA, DC12V/66.8mA, DC24V/26mA
• PD output capability: DC24V/3A 68℃, DC24V/5A 92℃
• INA226 communication address: 0x40/0x41
• Relay: DC 5-24V @5A
• User interaction: Rotary encoder switch, reset button, start button
• Operating temperature: 0-40°C
• Rail mounting: 51.5*48*5.5mm
• Dimensions: 48 x 51.5 x 40.5mm
• Weight: 70g

Scope of Delivery:

• 1x M5Stack VA Meter with voltage and current measurement