M5Stack Voltage and Amperage Meter with M5StampS3
📦 Location of the warehouse: Munich
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M5Stack Voltage and Amperage Meter with M5StampS3
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 the 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 |
Effective Date: March 27, 2025
At OpenELAB, we are committed to providing accurate product descriptions and delivering high-quality products. If you experience any issues with your purchase, please notify us within 60 days of the shipment date.
1. Warranty Disclaimer
Unless explicitly stated in a specific agreement or purchase order, OpenELAB makes no warranties—express or implied—regarding the fitness, suitability, or merchantability of any product for a particular purpose or special use.
2. Warranty Policy
Warranty Period
The standard warranty period for products sold by OpenELAB is 12 months from the date of delivery.
Under this warranty, OpenELAB will make a reasonable effort to repair or replace products free of charge if defects are due to issues with raw materials, design, or manufacturing.
If the defect qualifies under this policy but falls outside the covered scope, reasonable charges may apply for repair or replacement.
After the warranty period, support may still be available at a reasonable fee.
Warranty Exclusions
The warranty does not apply in the following cases:
- The product is beyond the 12-month warranty period.
- Damage due to misuse, improper maintenance or storage, or failure to follow the user guide or manual.
- Issues caused by Force Majeure events (e.g., natural disasters, war, legal changes, etc.).
- Unauthorized repair attempts by the customer.
- The product is not defective but has been opened and is non-returnable by policy.
3. Returns & Refunds
If you're not satisfied with your purchase, you may be eligible for a return or exchange:
- Return for Refund: Within 15 days of receipt (unopened).
- Return for Replacement: Within 30 days of receipt (damaged or defective).
- Exchange Window: Up to 30 days from receipt.
Please email us at info@openelab.io for a return authorization before sending anything back.
Return Conditions
- Items must be in original, clean, and mint condition with packaging intact.
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- Refunds may be subject to additional shipping fees unless the return is due to our error.
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