Precision Voltage and Amperage Monitoring Solution Using M5Stack and M5StampS3

Description

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Description

VAMeter is a professional, programmable, high-precision power meter designed for accurate voltage and current measurements. Powered by the Stamp-S3 module, it features Wi-Fi connectivity and two cascaded INA226 current/voltage sensing circuits, delivering current detection resolutions of 2.5 µA and 250 µA. The measurement range supports 0-5 A and 5-24 V (1-24 V in isolation mode).

The device offers flexible power-supply options through the USB-C port or the Base terminal, with built-in power and signal isolation. A slide switch lets users choose between isolated measurements powered via USB and non-isolated measurements powered directly from the test source, meeting various application needs.

The included expansion BASE provides relay on/off control and a Grove port for secondary development. Additional features include OTA firmware upgrades and USB MSC/OTG support, allowing users to view and edit data and configuration files stored in the main controller’s file system from a PC.

M5Stack also supplies a free online data API for uploading test data to the EZData platform, enabling remote access and visualization and greatly simplifying IoT application development.

VAMeter is a highly practical and developer-friendly instrument, ideal for projects requiring precise current and voltage measurements, as well as for industrial automation, equipment monitoring, smart grid, and related fields.

Features

• High-precision current detection (2.5 µA / 250 µA resolution switching)
• Wide voltage input (5-24 V)
• Cloud data display via EZData
• PD input (no PD trigger built in)
• Multiple power-supply methods (PD INPUT / Stamp-S3 / external terminal block)
• Power and signal isolation
• USB MSC/OTG support
• Open-source hardware & software
• Wireless OTA upgrade
• Development Platform
  • UiFlow2
  • Arduino IDE
  • ESP-IDF
  • PlatformIO

Includes

• 1 x VAMeter
• 1 x VAMeter Base
• 2 x 3.81-2P Terminal Block
• 4 x Hanger (Small)

Applications

• Industrial automation
• Equipment monitoring
• Power testing & analysis
• IoT devices
• Remote monitoring & data acquisition

Specifications

Specification	Parameter
SoC	ESP32S3FN8@Xtensa 32-bit LX7 dual-core processor, main frequency 240MHz
Power Detection Chip	INA226
Flash	8MB
Wi-Fi	2.4 GHz Wi-Fi
INA226 Communication Address	Dual detection chips INA226: 0x40 / 0x41
Display	1.3 inch @ 240 × 240 pixels
Display Driver	ST7789
PD Input Power	5-24 V @ 0-5 A
Current Resolution	2.5 µA / 250 µA
Current Sampling Err	Small current (1-100 mA): 1.01 % Large current (100 mA-5 A): 0.94 % µA-level current: 0.69 %
Voltage Error	Measurement error: 0.11 %
Power Consumption	Stamp-S3 USB powered: DC 5 V / 123.5 mA PD INPUT: DC 5 V / 118 mA DC 12 V / 66.8 mA DC 24 V / 26 mA
PD OUTPUT Capability	DC 24 V @ 3 A 68 ℃ DC 24 V @ 5 A 92 ℃
User Interface	Rotary encoder switch, Reset button, Boot button, onboard buzzer
Relay	DC 5 – 24 V @ 5 A
Operating Temp.	0 – 40 °C
Product Size	51.5 × 48.0 × 40.5 mm
Product Weight	43.4 g
Package Size	160.9 × 93.0 × 31.6 mm
Gross Weight	68.4 g

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