Add AUX input support via ES8388 analog bypass#7
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Adds a second audio source to FerroWave: - Bluetooth (existing): ESP32 decodes A2DP and drives the visualizer. - AUX / line-in: ES8388 codec routes the 3.5 mm jack input straight to the speakers through its analog bypass. A full-duplex ESP32 passthrough was attempted but produced audible white- noise bursts on the ESP32-A1S v2.2 + ES8388, so the analog bypass is used as the clean practical solution. As a result, the LED ring and the ferrofluid magnet stay idle while AUX is active. Switching is available via: - serial command: 'aux' / 'bt' - an optional push-button between GPIO 34 and GND See docs/AUX_INPUT.md for wiring and details.
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What this PR does
This adds a second audio source to FerroWave in addition to Bluetooth A2DP:
Why the analog bypass
A full-duplex ESP32 passthrough was tried first: reading the AUX signal from the ES8388 ADC through I2S in RXTX mode and copying it back to the DAC. That would have let the LED/magnet visualizer react to AUX audio too. Unfortunately it produced audible white-noise bursts in the background on the ESP32-A1S v2.2 + ES8388.
Routing the audio through the codec's analog mixer (CODEC_MODE_LINE_IN) is the cleanest working solution we found. The trade-off is that the AUX signal never enters the ESP32, so the visualizer stays idle while AUX is active.
How to switch source
auxorbtFiles changed
firmware/FerroWave.ino: adds source switching and the ES8388 analog bypass pathdocs/AUX_INPUT.md: user documentation covering wiring, limitations and build settingsBuild requirements
No change from the original firmware. If a missing-driver error appears, install arduino-audio-driver in addition to the existing libraries.
Note to the maintainer
If anyone knows how to get a clean full-duplex AUX passthrough on the ESP32-A1S + ES8388 (so the visualizer can also react to AUX), we would be happy to update this implementation. The current version prioritizes clean audio over visualization on AUX.