Emerging Interfaces
ESP32 Touch Pins Tutorial: Turning Any Surface Into an Input Without Adding a Chip
The ESP32 has capacitive touch sensing built into its GPIO. This walkthrough covers the raw read, picking a threshold that survives a change of weather, debouncing properly, using touch to wake the chip from deep sleep, building electrodes from copper tape and vinyl, and the differences between ESP32, S2, S3 and the parts that dropped the feature.