Adafruit
Mini 3-wire Volt Meter (0 - 99.9VDC)
A compact 3-wire voltage meter with a vivid green 3-digit 7-segment display. Reads 0–99.9VDC with 0.1V precision, making it perfect for monitoring battery le...
A compact 3-wire voltage meter with a vivid green 3-digit 7-segment display. Reads 0–99.9VDC with 0.1V precision, making it perfect for monitoring battery levels, power supplies, and electronic projects. Mounting tabs allow easy attachment to enclosures or panels.
The 3-wire design separates power from measurement — two wires power the display (4.5–28VDC) while the third wire connects to the voltage you want to measure. The built-in microcontroller reads the voltage against a stable reference and draws only 3–4mA.
Key Features
- Wide Measurement Range – 0V to 99.9VDC
- 0.1V Precision – 3-digit 7-segment green LED display
- 3-Wire Design – Separate power and measurement connections
- Low Power Draw – Only 3–4mA
- Mounting Tabs – Easy panel or enclosure mounting
Specifications
- Measurement Range: 0–99.9VDC
- Resolution: 0.1V
- Supply Voltage: 4.5–28VDC
- Current Draw: 3–4mA
- Display: 3-digit 7-segment (green LED)
Wiring
- Red wire: Positive power supply (4.5–28VDC)
- Brown/Black wire: Common ground
- Orange/White wire: Voltage measurement input
Ideal For
- Battery voltage monitoring
- Power supply readouts
- Breadboard and enclosure projects
- RC hobby battery tracking
Package Contents
- 1× Mini 3-Wire Volt Meter (0–99.9VDC, green display)
Jargon buster
Plain-language definitions for the technical terms used above.
- LED
- A light-emitting diode is a small electronic component that lights up when current flows through it in the correct direction. In this kit, LEDs create the flashing effect, so polarity and correct soldering matter for the project to work.
- microcontroller
- A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
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