Ultrasonic HC-SR04 with Median Filter
Distance measurement with noise reduction.

Distance measurement with noise reduction.

Pros/cons and interop tips.

Create a GATT service with a RW characteristic.

Notify temperature updates from ESP32 to phone.

Optimize binary size and features.

Try SSIDs sequentially with timeout and internet check.

CI to compile firmware on push.

Relay sensor packets via intermediate nodes.

Peer-to-peer fast packet exchange without router.

Serve a page and a simple JSON API.