M5Stack Voltage and Amperage Meter

SKU: MCC-021
  • Voltage and Amperage Measurement: Capable of real-time voltage and current measurement, ideal for power monitoring and performance analysis.
  • High-precision Sensors: Uses high-precision sensors to ensure accurate measurements, suitable for industrial-grade applications.
  • Supports Multiple Interfaces: Offers UART and I2C interfaces for easy integration with other devices or modules.
  • Real-time Data Transmission: Supports real-time data transmission and monitoring, enabling integration with IoT platforms for remote power monitoring.

39,90

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🕒 Order Processing Time

Orders are processed, verified, and packed within 2-5 business days (excluding weekends and holidays).
During peak seasons or sales events, processing may take up to 7 business days. We’ll notify you via email if a significant delay occurs.

 

⏱️ Estimated Delivery Time (After Processing)

RegionEstimated Delivery (Business Days)
Asia2–5
Western EU7–10
Eastern EU7–10
North America5–8
South America7–15
Australia5–8
Africa5–15

 

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📧 Email: info@sharingwin.com

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Hello, fellow geeks!

I’m an embedded systems engineer with a degree in IoT Engineering, and I’ve been deeply involved in AIoT product development for years. I’ve participated in several B2B projects from the ground up — covering open-source hardwaresystem architecturehardware selection, and solution implementation.

Through this journey, I’ve come across all kinds of AIoT products.
Some are smart, efficient, and elegantly designed; others are overcomplicated, packed with features that don’t solve real problems.
Over time, I’ve started focusing on one simple but important question:

Does this product truly solve the user’s core need?
Not just whether it’s ‘cool’ or uses the latest tech.

I firmly believe that great products don’t have to be complex or expensive — they just need to solve problems clearly and effectively, at a reasonable cost.

That’s why I created this site:
A space where engineers can connect, share, and learn from each other.

Here, I share great products and smart solutions I’ve encountered during projects — and try to explain why they’re good.
This isn’t about marketing. It’s about real experiencehonest judgment, and technical clarity.

This platform is called sharingwin, because I believe in shared success.

You’ll find high-value, practical tools and products here — to help you save time on selectionavoid unnecessary trial and error, and focus on what works.

As for me, I hope to use this space to connect with like-minded engineersexchange ideas, and — to be honest — maybe earn a little on the side too. That’s part of the fun. 😄

 

To all the makers and creators who’ve supported me along the way — thank you.
Due to some heavy personal projects recently, I haven’t been able to update or engage as frequently as I’d like — and for that, I apologize.
Moving forward, I’ll continue to optimize product content and be more active in sharing useful insights.

Your trust and support mean everything.
You’re the reason I believe this platform matters.

 

If you have any great products or ideas you think deserve more visibility, feel free to reach out.
I’m happy to help with sourcingconnect to the right supply chain, or feature it here so more engineers can see its value.

A single person has limited power —
but co-creation multiplies value.

If you believe in that too, let’s build something useful and meaningful — together.

M5Stack Voltage and Amperage 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/250uAResolution switching)
  • Wide voltage input (5-24V)
  • Cloud (EZData) 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

Applications

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

Video

Learn

Examples

Arduino

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 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) STAMPS3 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

module size

Hardware Overview

4.webp

PinMap

  • VAMeter(INA226 & BUZZER)
Note
INA226(0x40) and INA226(0x41) are used for measurements of different resolutions and sizes
M5STAMPS3 G5 G6 G41 G40 G14
INA226(0x40) FSDA FSCL ALERT1
INA226(0x41) FSDA FSCL ALERT2
BUZZER BUZ_PWM
  • VAMeter Extra output pin
M5STAMPS3 G10 G9 G8 G42
Extra output pin EXT_G10 EXT_G9 EXT_G8 EXT_G42
  • VAMeter Base
M5STAMPS3 G10
Relay GPIO10_REL
  • Grove
M5STAMPS3 G9 G8 VCC GND
Grove GPIO9 GPIO8 SYS_5V FGND

Include

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

Documents

EasyLoader

Download VA Meter Factory Firmware Easyloader

M5 EZData Cloud Platform example

schematics

Schematic

  • VAMeter

schematics

  • VAMeter Base

schematics

  • VAMeter internal circuit logic diagram

schematics

VA Meter Schematic PDF

VA Meter Base Schematic PDF

VAMeter Base PCB Download

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