Backup-Mirrors/Standalone-electricity-price-ticker
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Update README with TTP223 button wiring instructions

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Added section for TTP223 capacitive touch button alternative.
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Amir
2025-10-27 22:12:45 +01:00
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README.md
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@@ -1,3 +1,4 @@
```markdown
# Dynamic Electricity Price Ticker (XIAO ESP32C3) # Dynamic Electricity Price Ticker (XIAO ESP32C3)
This project displays day-ahead electricity prices for Slovenia (Energy-Charts API) on a 20x4 I2C LCD using a XIAO ESP32C3. This project displays day-ahead electricity prices for Slovenia (Energy-Charts API) on a 20x4 I2C LCD using a XIAO ESP32C3.
@@ -33,9 +34,25 @@ Pin usage (GPIO - function):
- Why: The RCWL-0516 output may float or remain high on boot; the pull-down ensures a defined LOW when idle and prevents the LCD backlight from unintentionally turning off or on. - Why: The RCWL-0516 output may float or remain high on boot; the pull-down ensures a defined LOW when idle and prevents the LCD backlight from unintentionally turning off or on.
- If you do not use a presence sensor, the firmware keeps the backlight ON by default. - If you do not use a presence sensor, the firmware keeps the backlight ON by default.
### Button wiring ### Button wiring (mechanical pushbutton)
- One leg of the pushbutton to GPIO4, the other to GND. The code uses INPUT_PULLUP, so no external resistor is required. - One leg of the pushbutton to GPIO4, the other to GND. The code uses INPUT_PULLUP, so no external resistor is required.
### ALTERNATIVE: TTP223 CAPACITIVE TOUCH BUTTON
- If you prefer a capacitive touch button instead of mechanical pushbutton:
WIRING:
- VCC to 3.3V power rail
- GND to GND
- OUT to GPIO 4 (same pin as pushbutton)
CODE CHANGES REQUIRED:
- Find the line in the sketch that reads: `int reading = digitalRead(buttonPin);`
- Change it to: `int reading = !digitalRead(buttonPin);`
- This inverts the logic since the TTP223 outputs HIGH when touched, while the pushbutton pulls LOW when pressed.
- No other changes are needed — all timing and debounce logic remains the same.
BENEFITS:
- No mechanical wear, sealed operation
- Can be mounted behind thin non-metallic panels
- More modern, sleek appearance
### White LED wiring ### White LED wiring
- GPIO5 -> 220Ω resistor -> LED anode - GPIO5 -> 220Ω resistor -> LED anode
- LED cathode -> GND - LED cathode -> GND
@@ -61,3 +78,4 @@ Pin usage (GPIO - function):
## License ## License
- Add license information here if you want to publish this repository. - Add license information here if you want to publish this repository.
```