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...
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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 (LED) is a small electronic component that emits light when current flows through it in the correct direction. Because it only conducts one way, its polarity matters, and a through-hole LED must be soldered the correct way around to light up.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
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