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A 128-tube VFD clock where Claude wrote all 8,000 lines of firmware

Cliff Lasser built a clock from 128 Soviet IV-25 VFD tubes on eight boards, each run by an Arduino Nano ESP32 over RS485. He wrote about 15 pages of specification, and Claude wrote all the code, now over 8,000 lines. The first version, about 3,500 lines, ran on the first try with one bug: the display was rotated 180 degrees.

Open original source hackaday.io · Cliff Lasser

Shown working
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Project page has six photos and a video of the finished clock running its animations.

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Preview image for A 128-tube VFD clock where Claude wrote all 8,000 lines of firmware
The source's own preview image, from hackaday.io.

Briefing

Lasser refined the specification with Claude until it had no more questions, then asked for code. He never read it; all debugging went through descriptions of what the clock did. To split the work, he had one Claude session write an interface document and passed Word documents between it and a second session.

The project page publishes the specification, the source and the hardware test code, with photos and a video of the finished clock. Brightness varied a lot between IV-25 tubes bought on eBay, so he switched to plug-compatible IVLM1-1/7 tubes.

“The author never wrote or read a single line.”

Cliff Lasser, in the source on hackaday.io

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