This VA Meter is a high-precision, programmable power meter designed for accurate voltage and current measurements. Based on the M5StampS3 control module, it supports WiFi connectivity. It includes two serially connected INA226 circuits for precise current detection, with resolutions of 2.5uA and 250uA, and a measurement range of 0-5A and 5-24V (1-24V in isolation mode).
Power can be supplied via USB-C or Base terminal input, with built-in power and signal isolation. The device also supports OTA firmware upgrades, and USB MSC/OTG functionality, and offers a free online data API for easy IoT integration. This meter is great for engineering projects, industrial automation, equipment monitoring, and smart grids. If you need precise voltage and amp measurements, this is the meter for you!
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 signal
- USB MSC/OTG function
- Open-source hardware and software
- OTA Upgrade
Specifications
| 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’@ 240 x 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 x 36 x 14.7mm |
| VAMeter 36 x 36 x 20.3mm | |
| Rail Fastening 51.5 x 48 x 5.5mm | |
| Package Size | 150 x 93 x 30mm |
| Product Weight | VAMeter: 17.7g VAMeter Base: 25.8g |
| Rail Fastening 4g | |
| Package Weight | 68.1g |
Resources
- Product Wiki
- Tutorial
- Schematic
- Base Schematic
- Base PCB
Package Contents
- 1x VA Meter
- 1x VA Meter Base
- 2x 3.81-2P terminal
- 4x Hanger (Small)
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