1.1 What is MOTOMETI?

MOTOMETI is a professional-grade precision measurement and telemetry system engineered for sound engineers, system technicians, and touring productions. The system monitors the physical tilt angles (Tilt / Roll / Pitch) and reference distances (Laser Top & Bottom) of line array clusters in real time during rigging, flying, and live performance.

By bridging physical bumper-mounted sensors with L-Acoustics SoundVision acoustic simulation files, MOTOMETI delivers immediate verification that the deployed speaker array is aimed precisely at the intended audience planes.

1.2 Quick Start in 4 Steps

1.3 Hardware Architecture & Specifications

• Orange Pi Zero 2W Sensor Module: Linux single-board computer in each METI sensor, managing telemetry sampling, live data streaming to the METI Server, and mDNS network advertisement.
• BNO085 9-DoF IMU: Fused orientation sensor (I²C) providing roll and pitch for each cabinet cluster or bumper.
• DFRobot SEN0366 Laser Rangefinder: UART laser distance sensor verifying stage, trim, or ground clearances.
• OLED / Status Indicators: Instant visual feedback of Wi-Fi connection, local IP address, battery health, and sensor readiness directly on the bumper.

2.1 Automatic mDNS Discovery

The MOTOMETI server automatically broadcasts its service over Multicast DNS (mDNS). Any workstation or device on the local network can open:

https://motometi.local:8090 or access the server directly via its IP address (e.g. https://192.168.1.100:8090).

2.2 Instant Mobile QR Code Pairing

Clicking the MOTOMETI logo on the top-left corner opens the quick mobile connection modal. Technicians or riggers scanning the QR code with their camera are taken directly to the responsive web dashboard without manual URL entry.

2.3 Cloudflare Zero Trust Remote Tunnel (4G/5G Access)

For festival sites without unified Wi-Fi between FOH and stage, or when senior engineers monitor arrays from remote locations, the integrated Cloudflare Tunnel delivers reliable access:

• Header Tunnel Badge: Displays green 🌍 Tunnel Online status when the tunnel is active.
• Secure HTTPS Transport: End-to-end TLS 1.3 encryption across cellular or public networks.
• WebXR & Camera Permissions: Modern browsers require HTTPS for camera and AR sensor access, which Cloudflare Tunnel fulfills automatically.

2.4 Header Telemetry Indicators

Figure 3.1: Live sensor tiles (METI View) displaying Roll, Pitch, Lasers 1/2, and tolerance status. Dashboard: /

3.1 Sensor Tile Layout

Each tile in the METI dashboard represents an individual physical measuring device on the rig:

• Device ID & Assigned Cluster: Displays the hardware identifier and its associated SoundVision cluster (e.g. Main Left - K2).
• Pitch (Tilt Angle): Shows the vertical inclination in degrees. Positive angles indicate upward tilt; negative angles indicate downward tilt toward audience planes.
• Roll (Horizontal Level): Shows lateral tilt. Should be as close to $0.00^\circ$ as possible to prevent uneven acoustic coverage and mechanical strain.
• Laser Distances 1 & 2: Optical distance from the bumper to floor, barriers, or reference points.

3.2 Tolerances & Visual Color Alerts

Configurable tolerance windows (e.g., $\pm 0.5^\circ$ for Pitch and $\pm 0.2^\circ$ for Roll) can be defined in Global Settings:

3.3 Zero Offset Calibration

When a sensor is mounted on a bracket with a mechanical offset relative to the bumper reference plane:

1. Place the sensor unit on a verified 100% level surface.
2. Click the gear icon on the sensor tile to open device settings.
3. Click Calibrate Zero Offset. The baseline offset is persistently saved to device configuration.

Figure 4.1: SoundVision cluster overview comparing simulated target angles with physical sensor readings. Dashboard: /clusters

4.1 Exporting Cluster Data from SoundVision

In L-Acoustics SoundVision, generate the project report as a PDF:
File ➔ Export ➔ Report (.pdf)

When uploaded to MOTOMETI, the system automatically extracts:

• Cluster names (e.g. Main L, Main R, Outfill, Subs).
• Enclosure models (K1, K2, Kara II, Kiva II, A15, etc.).
• Cabinet count per hang.
• Simulated site angle and inter-element splay angles.
• 3D coordinates $(X, Y, Z)$ for rigging pick points and cluster centers.

4.2 Assigning Physical METI Devices

In the Clusters view, use the device dropdown on each cluster card:

4.3 Real-Time Delta Calculation ($\Delta$)

The delta value represents angular discrepancy: $$\Delta_{\text{pitch}} = \text{Measured}_{\text{pitch}} - \text{Target}_{\text{pitch}}$$

A delta of +0.8° indicates that the physical cluster is aimed 0.8 degrees higher than the acoustic design.

Figure 5.1: 3D Arena venue with line array clusters and stage geometry. 3D: Inside Mode

Figure 5.2: Panflex acoustic coverage beams and floor projection. Visual Acoustics

5.1 View Options Toolbar

Control visual layers and acoustic overlays from the 3D sidebar:

5.2 3D Viewport Navigation

• Orbit / Rotate: Left-click and drag (or 1-finger swipe on touch screens).
• Pan: Right-click and drag (or 2-finger swipe).
• Zoom: Mouse wheel scroll (or 2-finger pinch gesture).
• Preset Views: Use Top, Front, Side, FOH, Reset quick-buttons for standard sound-engineering viewpoints.

Figure 6.1: Outdoor 3D map with speaker towers, clusters, and geospatial positioning. Dashboard: /3d (Outside)

Figure 6.2: Extruded 3D buildings with floor heights, roads, and water bodies. OpenStreetMap 3D

Figure 6.3: Address geocoding search with instant navigation and coordinate anchoring. Nominatim Geocoding

6.1 Intelligent Building Height Heuristics

At outdoor festivals and city arenas, neighboring buildings act as critical acoustic barriers and reflection surfaces. MOTOMETI queries OpenStreetMap vector data and extrudes structures using a prioritized heuristic:

1. height / min_height tags explicitly declared in meters from OpenStreetMap.
2. building:levels tag multiplied by $3.2\text{ meters}$ per floor.
3. Contextual building type fallbacks (churches, warehouses, apartments, industrial structures).

6.2 Geo-Anchoring & D-Pad Nudge

To anchor your SoundVision system $(0,0,0)$ origin onto real-world coordinates:

• Address Search: Type venue names or addresses in the search field to jump instantly.
• D-Pad Meter Nudge: Fine-tune origin coordinates in discrete steps: 10 cm, 50 cm, 1 m, 5 m, 20 m in North, South, East, West directions.
• Heading Slider: Rotate the stage coordinate system from $0^\circ$ to $360^\circ$ to align arrays with physical lawn or bleacher boundaries.
• Labels Toggle: Turn speaker name badges on or off for clean, uncluttered visual inspection.

Figure 7.1: Venue Preset Manager with coordinates, heading, and file associations. Modal: 🏛️ Presets

Figure 7.2: File manager for SoundVision PDF reports and 3D drawings. Files & Storage

7.1 What is stored in a Venue Preset?

A MOTOMETI Venue Preset preserves an entire site configuration:

• Venue Name & Address: Human-readable identifiers and geographic location.
• Geo Coordinates: Latitude, Longitude, and Stage Heading rotation.
• Associated Files: SoundVision PDF report and 3D venue geometry (DXF / OBJ).
• Device Mappings: Which hardware sensors are assigned to specific clusters.
• Atmospheric Data: Temperature, relative humidity, and barometric pressure.

7.2 Global WebSocket Synchronization

Figure 8.1: SoundVision 3D Room Data format (.txt) generated with buildings, terrain, roads, and water. Export: SoundVision .txt

Figure 8.2: SoundVision Desktop import dialog (Open Room Data File). SoundVision Desktop

Figure 8.3: Imported 3D venue in SoundVision with stage, audience zones, and surfaces. Result in SoundVision

8.1 Differentiated Height Layers ($Z$) in Export

When MOTOMETI exports surrounding venue geography to SoundVision 3D format, differentiated $Z$-layers prevent z-fighting and ensure clean visual rendering:

8.2 Step-by-Step SoundVision Desktop Import

1. In MOTOMETI, open 3D ➔ Outside Map and click 📥 Download SoundVision (.txt).
2. Launch L-Acoustics SoundVision on your workstation.
3. In the top menu, navigate to File ➔ Import ➔ Room Data....
4. Select the downloaded .txt file and verify coordinates (Meter scale, right-handed coordinates).
5. Surrounding structures, roads, and water bodies now appear natively in your SoundVision 3D acoustic room!

Figure 9.1: WebXR AR live camera view with real-time telemetry HUD. Dashboard: /ar

Figure 9.2: AR Nudge D-pad controller for precise positioning. AR Control Panel

Figure 9.3: Holographic 3D speaker cluster projected directly into the physical stage environment. Holographic Alignment

9.1 On-Stage AR Rigging Workflow

AR mode lets engineers aim a mobile phone or tablet toward the stage structure to preview where speaker arrays should hang before motor hoists are pulled:

• Sightline Verification: Confirm that PA towers do not obscure IMAG video screens, spot fixtures, or sightlines.
• Barrier Coverage: Visually inspect the intersection of the lowest cabinet dispersion cone with front barricades.
• Trim Height Verification: Match the holographic bottom enclosure against laser tape targets.

9.2 AR Nudge Fine-Tuning

If device gyroscope drift occurs, use the on-screen AR Nudge D-pad controller to reposition the holographic model with centimeter precision.

10.1 Atmospheric Influence on Long-Throw Audio

Sound propagation through air is heavily influenced by ambient temperature, relative humidity, and barometric pressure. At festival distances (60–120 m), dry afternoon air can induce severe attenuation exceeding 6–12 dB at 8–12 kHz compared to humid evening air.

10.2 Open-Meteo Live API Integration

MOTOMETI automatically retrieves real-time weather observations for the venue's GPS location, displaying live readings in the header:
🌡️ 20.0°C · 50% RH · 1013 hPa

10.3 ISO 9613-1 Atmospheric Absorption Rates

Theoretical air absorption values in dB per 100 meters across key octave bands:

11.1 Frequently Asked Questions (FAQ)

11.2 Keyboard Shortcuts

11.3 Support & Production Inquiries

For custom bracket calibration, firmware updates, or production support, contact the MOTO METI engineering team.