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Add touch-pad sync page

blue — ESP32/PlatformIO firmware 2026-06-10 14:19:02 -04:00
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Speaker-Sync-%28Touch%29.md Normal file

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# Speaker Sync (touch pads)
JBL and Cardo have independent Bluetooth buffering, so one lags the other. Each
**source board** has an adjustable delay (0-200 ms) you trim live, **by ear**, with
two capacitive-touch pads. The value is saved to flash (survives power-cycles).
| Pad | Pin | Action |
|-----|--------|-------------------------------|
| + | GPIO4 | tap = +5 ms, hold = ramp up |
| - | GPIO27 | tap = -5 ms, hold = ramp down |
- Attach a short wire or a bit of foil to GPIO4 and GPIO27 on each source board and
touch the end (a bare header pin is hard to trigger).
- Raise the delay on whichever speaker is **early** until the two line up.
- Touch threshold is ~40 (untouched reads ~115-130); adjust in firmware if your
pads read differently.
**Why no Wi-Fi/phone UI:** Wi-Fi + Bluetooth-A2DP + the audio buffer exceed the
classic ESP32's RAM and starve the Bluetooth stack (it won't connect to a speaker).
So sync control is local capacitive touch instead of a web page.