0.28-inch 3-Wire Mini Digital DC Voltmeter Module
Roll over image to zoom in
৳ 60.00৳ 80.00 (-25%)
The 0.28-Inch 3-Wire Mini Digital DC Voltmeter is an ultra-compact, high-precision voltage panel meter featuring a bright red 3-digit LED display. Thanks to its independent 3-wire design, it can accurately measure wide-ranging electrical loads from 0V to 100V DC without losing power at lower thresholds. With integrated reverse-polarity protection and an auto-adjusting decimal point, it is the perfect diagnostic panel gauge for monitoring automotive batteries, solar charging setups, DIY power supplies, and RC hobby electronics.
Full Product Description
The 0.28-Inch 3-Wire Mini Digital DC Voltmeter Module is an ultra-compact, high-precision electronic panel meter designed for real-time voltage monitoring across a wide electrical spectrum. Featuring a bright, high-visibility red 3-digit LED 7-segment display, this miniature gauge provides clear, sharp readouts even in low-light environments. Unlike standard 2-wire voltmeters that stop functioning when the measured load drops below 4V, this premium 3-wire configuration utilizes an independent power line to drive the internal microcontroller, allowing it to accurately measure external potentials down to absolute zero (0V to 100V DC).
Engineered with high measurement reliability, the voltmeter incorporates an automatic decimal point adjustment system that shifts resolution between 0.01V and 0.1V depending on the voltage scale, maximizing precision across both micro-electronics and large battery arrays. The circuit board features built-in reverse polarity protection to prevent catastrophic component burnout if the power leads are accidentally swapped. Its tiny footprint, integrated chassis mounting tabs, and flexible installation layout make it the perfect panel readout for custom desktop bench power supplies, solar charging regulators, electric bicycles, automotive battery monitors, and DIY robotics projects.
Key Product Features
- Zero-Volt Measurement Capabilities: Independent 3-wire layout allows the module to read voltage drops from 0V up to 100V DC without shutting down at low levels.
- Auto-Shifting Decimal Precision: Automatically shifts decimal points to deliver 0.01V resolution below 10V and a stable 0.1V resolution for measurements between 10V and 100V.
- Reverse Polarity Safeguard: Onboard protective components safely shield the internal micro-chip from burning out if the positive and negative power wires are inverted during wiring.
- High-Contrast Red LED Display: Crisp 3-digit numeric array ensures instant readability under bright indoor lighting or dark equipment enclosures.
- Compact Flanged Chassis Base: Features dual pre-molded side tabs with mounting holes for quick screw-on installation directly onto dashboard panels, control boxes, or project enclosures.
Technical Specifications
| Parameter | Specification Details |
|---|---|
| Display Window Size | 0.28 Inch Diagonal Display |
| LED Readout Color | High-Contrast Monochromatic Red |
| Voltage Measurement Bounds | DC 0.00V – 100.0V |
| Module Operating Voltage (VCC) | DC 4.0V – 30.0V (Standard 5V/12V optimal power range) |
| Measurement Accuracy / Tolerance | ± 1% to 3% (Depending on environmental temperatures) |
| Refresh Interval / Rate | Approximately 300 ms (Milliseconds) per cycle |
| Input Internal Resistance | Greater than 100K Ohms |
| Static Power Consumption Draw | Low operating current (< 20mA typical draw) |
| Physical Dimensions Profile | Approx. 30mm x 11.5mm x 9mm (Excluding side tabs) |
Three-Wire Pinout Connection Guide
- Red Wire (VCC / Operating Power): Connects to the positive terminal of a stable auxiliary power supply (4V to 30V DC) to keep the LED screen powered.
- Black Wire (GND / Ground): Connects to the common negative terminal or system ground reference share point.
- Yellow / White Wire (VIN / Measurement Input): Connects directly to the specific target point or load you want to test and measure (0V to 100V DC).
Reviews
There are no reviews yet.