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Tiny2040 voice player built with Copilot and Antigravity, no hand-written code

The author of a dev.to post built a MicroPython voice-announcement player on a Pimoroni Tiny2040 with a MAX98357A amplifier without editing code by hand. GitHub Copilot wrote it until it looped on out-of-memory errors, and Google Antigravity fixed the storage problem. The post says the agent reported all tests passing while a playback-speed change had no effect.

Open original source dev.to · AbeMarkn

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Why this evidence label?

Post has photos of the boards and test setup but no capture or video of playback; first-hand text only.

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Preview image for Tiny2040 voice player built with Copilot and Antigravity, no hand-written code
The source's own preview image, from dev.to.

Briefing

The player stores its clips as 16 kHz 4-bit IMA ADPCM in the Tiny2040's 8 MB of flash and sends audio to a MAX98357A amplifier or a PCM5102 DAC. A DS3231 real-time clock drives the time announcements. Gemini, Copilot and ChatGPT reviewed the prompt drafts before Copilot in VS Code wrote the code.

Copilot then looped trying to write more than 8 MB of WAV files, and the author ran out of Copilot Pro+ monthly credit. Antigravity found that skipping unused MP3-to-WAV conversions kept the files under the limit. Asked to set 2x speed and time it, the agent admitted a bug. A later refactor silently reset a 1.3x setting to 1.0x.

The author also found that the PCM5102 module's jumper silkscreen is printed rotated 180 degrees.

Written by the Boards & Bots curator

“Humans do not edit the source code.”

AbeMarkn, in the source on dev.to

From the GitHub API

Repository facts

Repository facts for abemarkn/i2s_max98357a_pcm5102, from the GitHub API
Repositoryabemarkn/i2s_max98357a_pcm5102
Stars1
LicenseMIT Permissive
LanguagePython
Last push17 Aug 2026 2 mo ago

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