A nicer voltmeter clock

A hobbyist has unveiled a revised design for a voltmeter clock, featuring a cleaner aesthetic and smoother motion, making the project more accessible and visually appealing for electronics enthusiasts.

The new voltmeter clock uses three generic 90° panel voltmeters sourced from Amazon, disassembled and customized with printed decals for time display. The design incorporates a recessed front panel to hide the meters’ plastic flanges, achieved through CNC machining and precise wood bending techniques.

The clock’s circuit is built around an AVR128DB28 microcontroller, which controls the meters via digital output pins using a high-frequency pulse train, eliminating the need for complex digital-to-analog conversion. The software manages continuous motion of the hands by adjusting pulse duty cycles, providing a smooth transition between time units. The circuit is powered by a standard wall wart, with simple pushbuttons for setting the time.

Why It Matters

This project demonstrates how affordable components and straightforward electronics can create a visually compelling and functional clock, appealing to hobbyists and makers. It also offers an alternative to traditional digital clocks, emphasizing craftsmanship and customization, which could inspire similar DIY projects.

Aramox Digital Voltmeter Plastic AC Voltage Meter 90 to 450V 3 Digit LED Display 0 to 99Hz Snap in Panel Gauge for Gasoline Generator Single Phase 3 Phase Users

• Real-Time AC Voltage Monitoring: Displays 90-450V with 1V resolution
• Multi-Function Display: Shows voltage, frequency, and runtime
• Generator Compatibility: Suitable for single and three-phase generators

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Background

The original voltmeter clock concept was introduced in 2019, with subsequent modifications often being complex or less aesthetically pleasing. This latest version simplifies construction and improves appearance, reflecting ongoing interest in analog, electronics-based time displays among hobbyists. The use of inexpensive, readily available parts and open-source code makes it accessible for a broad audience.

“The new design aims to be both more beautiful and easier to build, using common parts and simple techniques.”

— the creator

“It’s impressive how straightforward modifications can significantly enhance the look and feel of a voltmeter clock.”

— electronics enthusiast community

What Remains Unclear

Details about long-term durability, accuracy of the continuous motion, and potential for commercial production remain unconfirmed. The project is primarily a hobbyist prototype, and scalability or mass production considerations are still unclear.

What’s Next

The creator may release detailed build instructions and source code publicly, encouraging others to replicate or modify the design. Further refinements could include wireless time setting or enhanced aesthetics, with community feedback guiding future iterations.

Key Questions

How accurate is the clock’s timekeeping?

The clock relies on an AVR microcontroller with a crystal oscillator, which provides reasonable accuracy for hobbyist use. Precision depends on the crystal quality and calibration but is not intended for exact timekeeping like commercial clocks.

Can I build this clock with different voltmeters?

Yes, as long as the voltmeters are 90° panel meters and can be disassembled and customized with decals, they can be integrated into the design. Compatibility with the control circuitry should be verified.

Is this project suitable for beginners?

While it involves some woodworking, circuit assembly, and programming, the project is accessible to hobbyists with basic electronics and woodworking skills. Detailed instructions and open-source code are expected to be shared.