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Side shot showing LED Voltage Meter (Blue) with digital display and red wires.-DFRobot product sku:DFR0130-B image.
Front of blue LED voltage meter measuring 3V-40V with red digital display and black/orange wires for automotive use
Front shot of LED voltage meter blue with battery level indicator and 3V-40V accuracy.
Angled shot of the blue LED voltage meter for accurate battery level monitoring.
Front of accurate 3-40V voltage meter for battery monitoring

LED Voltage Meter (Blue)

$1.90
SKU: DFR0130-B
Standalone DC voltage meter measures 3V-40V with 1% accuracy, ideal for battery-level display. Available in green, blue, or red. Suitable for robotic applications.
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  • Blue
    Blue
    $1.90
  • Green
    Green
    $1.90
  • Red
    Red
    $1.50
IntroductionFeaturesApplicationsSpecificationShipping List

Introduction

DFRobot LED Voltage Meter is a compact standalone DC voltage display designed for quick and reliable monitoring of power systems. This digital battery level indicator measures DC voltages from 3.0V to 40V with 1% accuracy and a responsive 2 Hz refresh rate, providing clear real‑time readings for embedded electronics, robotics power rails, and portable battery packs. A simple two‑wire connection powers the display and measures the input simultaneously, eliminating the need for external circuits. This miniature voltage monitoring module offers a practical solution for engineers, makers, and hobbyists requiring fast visual feedback during prototyping or system integration.


Simple Two‑Wire Standalone Operation

This compact DC voltage display functions as a fully self‑contained monitoring module requiring only two wires connected directly to the measured power source. No external microcontroller, signal conditioning circuit, or calibration procedure is required. Such straightforward wiring greatly simplifies integration into battery packs, motor controllers, robotics platforms, and portable electronics. Rapid installation makes this LED voltage indicator especially useful during prototyping or field diagnostics, where quick visual confirmation of supply voltage helps maintain stable operation across multiple subsystems.


Wide Measurement Range with Clear Digital Display

This embedded voltage monitoring board measures DC voltage from 3.0V to 40V with approximately 1% accuracy and refreshes readings at 2 Hz for stable real‑time feedback. The bright LED display enables quick visual interpretation of supply levels in power distribution systems, battery‑powered robots, and DIY electronics. Multiple color variants are available, including green, blue, and red, allowing builders to match visual indicators with project aesthetics or panel designs.



Practical applications include battery level monitoring, robotics power diagnostics, motor driver voltage feedback, and portable electronics testing. This LED digital voltmeter provides instant visual confirmation of supply conditions without complex instrumentation, making the small DC voltage display module a convenient addition to maker workbenches, embedded system prototypes, and educational electronics setups.

Features

  • Standalone LED DC voltage meter requiring only two wires
  • Wide measurement range from 3.0V to 40V DC
  • Approximately 1% measurement accuracy
  • 2 Hz refresh rate for stable real‑time readings
  • Compact form factor suitable for embedded electronics and robotics
  • Multiple LED color options: green, blue, and red

    • Applications

  • Battery level monitoring for portable electronics
  • Robotics power supply diagnostics
  • Motor controller voltage monitoring
  • DIY electronics and embedded system prototypes
  • Educational electronics experiments

    • Specification

    Basic Parameters

  • Measure Voltage:3.0-40V DC
  • Refresh Rate:2 Hz
  • Accuracy:1%

    • Shipping List

  • LED Voltage Meter (Blue) x1
    • LED Voltage Meter (Blue)
    $0.00