linkind PIR Motion Sensor, Wireless Motion Detector, Zigbee White, for DIY Use with Home Security System,
Gadget-freakz - Thanks to Antenne519, we now know how to modify a Xiaomi door/contact sensor and make for example a water leakage sensor, or connect something else to it. https://gadget-freakz.com/build-your-own-universal- zigbee-logic-sensor-by ...
DIY zigbee devices
DIY Tuya Zigbee3.0 Gateway Home Alarm System Bridge Hub Multi-Sensors Control By Smart Life App - AliExpress
GitHub - diyruz/flower: DIY Zigbee flower sensor
How to Make a Wireless Sensor Live for a Year on One Tiny Coin Cell Battery