Initial FilamentGauger firmware

README.md

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+# FilamentGauger
+
+PlatformIO firmware for the Guition `JC8048W550(C)` display with an `HX711` load-cell amplifier.
+
+Pins:
+- `HX711 SCK -> IO17`
+- `HX711 DOUT -> IO18`
+
+Important:
+- On this display family `IO18` is normally used by the capacitive touch interrupt.
+- In this firmware the touch controller stays enabled, but its interrupt pin is moved to `GPIO_NUM_NC`, so touch works in polling mode and `IO18` becomes available for `HX711`.
+
+Default calibration flow:
+1. Leave the platform empty.
+2. Tap `Tare`.
+3. Put a `100 g` reference weight on the platform.
+4. Tap `Cal 100 g`.
+
+Serial commands:
+- `tare`
+- `cal 100`
+- `scale 432.1`
+- `reset`
+- `status`
+
+Build:
+```bash
+platformio run
+```