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
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