VAMeter
SKU:K136
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
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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
Includes
- 1x VA Meter
- 1x VA Meter Base
- 2x 3.81-2P terminal
- 4x Hanger (small)
Applications
- Industrial Automation
- Equipment Monitoring
- Power Testing and Analysis
- Internet of Things (IoT) Devices
- Remote Monitoring and Data Collection
Specifications
| 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.
M5 EZData Cloud Platform example
PinMap
- VAMeter(INA226 & BUZZER)
| 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 |
VAMeter compared to other brands
Related Link
Schematic
- VAMeter
- VAMeter Base
- VAMeter internal circuit logic diagram
Model Size
Examples
IDF
Video
- VAMeter Function Introduction