SKU:K136
VAMeter is a professional, programmable, high-precision power meter designed for accurate voltage and current measurements. Powered by the Stamp-S3 module, it features Wi-Fi connectivity and two cascaded INA226 current/voltage sensing circuits, delivering current detection resolutions of 2.5 µA and 250 µA. The measurement range supports 0-5 A and 5-24 V (1-24 V in isolation mode).
The device offers flexible power-supply options through the USB-C port or the Base terminal, with built-in power and signal isolation. A slide switch lets users choose between isolated measurements powered via USB and non-isolated measurements powered directly from the test source, meeting various application needs.
The included expansion BASE provides relay on/off control and a Grove port for secondary development. Additional features include OTA firmware upgrades and USB MSC/OTG support, allowing users to view and edit data and configuration files stored in the main controller’s file system from a PC.
M5Stack also supplies a free online data API for uploading test data to the EZData platform, enabling remote access and visualization and greatly simplifying IoT application development.
VAMeter is a highly practical and developer-friendly instrument, ideal for projects requiring precise current and voltage measurements, as well as for industrial automation, equipment monitoring, smart grid, and related fields.
Specification | Parameter |
---|---|
SoC | ESP32S3FN8 @ Xtensa® 32-bit LX7 dual-core, up to 240 MHz |
Power Measurement IC | INA226 |
INA226 I²C Address | Dual INA226 sensors: 0x40 / 0x41 |
Flash | 8 MB Flash |
Wi-Fi | IEEE 802.11 b/g/n (2.4 GHz) |
Display | 1.3 inch @ 240 × 240 pixels |
Display Driver | ST7789 |
PD Input Power | 5-24 V @ 0-5 A |
Current Resolution | 2.5 µA / 250 µA |
Current Sampling Err | Small current (1-100 mA): 1.01 % Large current (100 mA-5 A): 0.94 % µA-level current: 0.69 % |
Voltage Error | Measurement error: 0.11 % |
Power Consumption | Stamp-S3 USB powered: DC 5 V / 123.5 mA PD INPUT: DC 5 V / 118 mA DC 12 V / 66.8 mA DC 24 V / 26 mA |
PD OUTPUT Capability | DC 24 V @ 3 A 68 ℃ DC 24 V @ 5 A 92 ℃ |
User Interface | Rotary encoder switch, Reset button, Boot button, onboard buzzer |
Relay | DC 5 - 24 V @ 5 A |
Operating Temp. | 0 - 40 °C |
Product Size | 51.5 × 48.0 × 40.5 mm |
Product Weight | 43.4 g |
Package Size | 160.9 × 93.0 × 31.6 mm |
Gross Weight | 68.4 g |
ESP32S3FN8 | G5 | G6 | G41 | G40 | G14 |
---|---|---|---|---|---|
INA226 (0x40) | FSDA | FSCL | ALERT1 | ||
INA226 (0x41) | FSDA | FSCL | ALERT2 | ||
BUZZER | BUZ_PWM |
ESP32S3FN8 | G10 | G9 | G8 | G42 |
---|---|---|---|---|
Expansion | EXT_G10 | EXT_G9 | EXT_G8 | EXT_G42 |
ESP32S3FN8 | G10 |
---|---|
Relay | GPIO10_REL |
HY2.0-4P | Black | Red | Yellow | White |
---|---|---|---|---|
PORT.CUSTOM | GND | 5V | G8 | G9 |
Easyloader | Download | Note |
---|---|---|
VAMeter Firmware Easyloader | download | / |