ESP32 Compatible KY-0xx module Sensors

The KY series is the "37 sensors in one box" kit that ships under many brand names - buttons, joysticks, tilt and vibration switches, hall sensors, sound and flame detectors, LEDs and lasers. Each module does one simple thing and outputs it as a digital line, an analog level, or both, so they need little or no library support and wire up in minutes. That makes them ideal for learning the ESP32's GPIO, ADC and interrupt basics before committing to more serious parts.

Every KY page here documents the pinout, safe ESP32 wiring and working code, because the kit leaflets rarely do. Two practical notes: the analog outputs need the ESP32's ADC1 pins, and build quality varies between kit vendors, so a flaky module is sometimes just a flaky module.