Description

Description

VA Meter is a professional programmable high-precision power meter designed for accurate voltage and current measurement. This product is based on the M5StampS3 main control module, supporting WiFi functionality. It features two serially connected INA226 current and voltage measurement circuits, providing current detection resolutions 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 through a USB-C interface or Base terminal input and includes built-in power and signal isolation. Users can select between isolated measurement via USB power or non-isolated measurement using direct power through a toggle switch, catering to different application needs. The accompanying expansion BASE includes relay on off control and a Grove port for secondary development.

Additionally, the instrument supports OTA firmware upgrades and USB MSC OTG functionality, allowing users to edit and view data and configuration files stored in the main control file system on a PC. M5 also provides a free online data API interface, enabling users to upload test data to the EZData platform for remote access and browsing, significantly simplifying IoT application development. The VA Meter is a versatile and developer-friendly instrument, ideal for engineering projects requiring precise current and voltage measurements, as well as fields such as industrial automation, equipment monitoring, and smart grids.

Features

• High precision current detection (2.5uA 250uA precision switching)
• Wide voltage input (5-24V)
• Cloud (EZData) real-time data display
• PD input (internal does not contain PD decoy)
• Multiple power supply modes (PD INPUT StampS3 External terminal)
• Power is isolated from signal
• USB MSC OTG function
• Open source hardware and software
• OTA Upgrade

• Includes

  • 1x VA Meter
  • 1x VA Meter Base
  • 2x 3.81-2P terminal
  • 4x Hanger (small)

  • Applications

    • Industrial Automation
    • Equipment Monitoring
    • Smart Grid
    • Power Testing and Analysis
    • Internet of Things (IoT) Devices
    • Smart Home Management
    • Remote Monitoring and Data Collection

    • Specification

      Resources		Parameters
      Power detection chip		INA226
      SoC		ESP32S3FN8@Xtensa® 32-bit LX7 dual-core processor up to 240 MHz
      Flash		8MB Flash
      PSRAM		N A
      Wi-Fi		IEEE 802.11 b g n (2.4 GHz Wi-Fi)
      Screen		1.3 Inch@ 240*240 Pixel
      Screen Driver		ST7789
      PD Input Output Power		5-24V@0-5A
      Current detection resolution		2.5uA 250uA
      Current sampling error		Small current (1-100mA) sampling error: 1.01% Large current (100mA-5A) Sampling error: 0.94% UA-level current sampling error: 0.69%
      Power Consumption (factory firmware)		SSTAMP_S3 USB power supply: DC5V 123.5mA PD INPUT power supply: DC5V 118mA     DC12V 66.8mA     DC24V 26mA
      PD OUTPUT capability		DC24V 3A 68℃ DC24V 5A 92℃
      USER interaction		Rotary encoder switch, reset button, boot button and board
      INA226 Communication Address		Two detection chips INA226:0x40 0x41
      Relay		DC 5-24V @5A
      Operating Temperature		0-40°C
      Product Size		VAMeter 36*36*14.7mm VAMeter 36*36*20.3mm Rail Fastening 51.5*48*5.5mm
      Package Size		150*93*30mm
      Product Weight		VAMeter:17.7g VAMeter Base:25.8g Rail Fastening 4g
      Package Weight		68.1g

      LEARN AND DOCUMENTS

      DOCUMENTS

      Additional information

      Title	Default Title