Enable motion access

This tool uses your phone's motion sensors to measure elbow range of motion. On iOS Safari you will be prompted to allow motion and orientation access.

Use with the phone strapped along the forearm.

If motion is blocked, on iOS go to Settings > Safari > Motion & Orientation Access and enable it.

Connect chest sensor

Make sure the Arduino Uno R4 WiFi is powered on and advertising BLE. Use Chrome on Android or desktop — Web Bluetooth is not supported on iOS Safari.

📡 Searching for device…
🔗 Connecting to GATT server…
🔍 Discovering BLE service…
📥 Subscribing to orientation data…
✅ Connected — receiving data

Ortho-Precision ROM

Elbow & shoulder assessment with motion + Bluetooth chest reference. Mobile-first clinical workflow.

Patient & session

Patient ID

Date

Clinician

Side

Joint

Real-time angle

degrees (°)

0° = calibrated full extension. Positive values = flexion, negative = extension beyond neutral.

Circle: 0%

Chest sensor: Not connected

Moving

Hold 1 second at end range before recording.

Neutral not set

Movement: Flexion Extension Other

Waiting for motion permission. Use the button at the top if needed.

Recorded readings

No readings yet. Aim for 3 trials.

Patient history

Session data is stored securely on this device.

Clinician notes

Export

CSV can be stored in the record; PDF is generated via your browser's print-to-PDF.

Measurement instructions Tap to toggle

Strap phone longitudinally along the forearm. Press Set neutral with the arm in full extension (anatomical 0°). Ask the patient to flex to their maximum comfortable flexion and hold. When the indicator shows Stable, press Record reading. Repeat for at least three trials.