Bluetooth Device Finder: Radar

The app scans every Bluetooth and BLE device broadcasting nearby, sorts them by signal strength, then walks you to the one you want in four steps: scan, select, follow, found. The meter updates continuously through Weak, Medium, Strong and Very close.

The part I am most pleased with is the signal processing. Raw RSSI readings are noisy, so I added a smoothing layer that lets the meter rise and fall steadily instead of jumping around. The direction finder uses the phone compass to estimate where the signal is strongest, which is a real measurement rather than a decorative arrow.