Voltage and Amperage Meter

M5Stack Voltage and Amperage Meter with M5StampS3

Product Link

M5Stack Voltage and Amperage Meter with M5StampS3OpenELAB

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.

Tutorial

Quick Start Quick Start

This tutorial will introduce you to the VA Meter device tutorial & Get started quicklyDownload ModeIf you want to enter download mode, press and hold the G0 button on StampS3 before turning it on, then release it after powering it on.

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

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

EasyLoader

EasyLoader is a concise and fast program writer, which has a built-in case program related to the product. It can be burned to the main control by simple steps to perform a series of function verification.

Download VA Meter Factory Firmware Easyloader