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The Open-Motion System

The Open-Motion hardware platform consists of three primary components.

Component Description
Console Houses the laser, electronics and optics, power cable, and an on/off switch on the back. Should never be opened — risk of laser radiation exposure and electrical hazards.
Sensor Module(s) Wearable modules containing an array of camera sensors (configurable via software) and on-module histogram processing.
Laser Class 1, 795 nm, pulsed, integrated inside the Console.

Do not disassemble the Console

The Console contains a Class 3 laser source and high-voltage electronics. Opening the enclosure risks permanent eye injury and electric shock and voids all warranties.

Open-Motion specifications

Console
Operating voltage 100–240 VAC, 50–60 Hz, 0.5 A
Connections 1× USB-C (USB 3.0)
1× SMA trigger (input)
1× SMA sync (output)
2× electrical ports (left / right)
2× optical ports (left / right)
Device status LED indicator
Dimensions (W × H × D) 9.8 × 3.0 × 6.3 in (250 × 75 × 160 mm)
Weight 3 lb (1.36 kg)
Console rear panel and Sensor Module side panels with labeled ports: A SMA trigger output, B left Sensor Module electrical and optical ports, C right Sensor Module electrical and optical ports, D SMA trigger input, E power switch, F USB-C, G status LED.
Figure 1 — Parts of the Console (ER-00014 Rev A, p. 8). A SMA trigger output, B/C left and right Sensor Module ports, D SMA trigger input, E power switch, F USB-C, G status LED.

Sensor Module

Each Open-Motion device uses two Sensor Modules.
Image sensors 1/3.52" CMOS
Resolution 1920 × 1280
Frame rate 40 Hz
Pixel size 2.2 μm × 2.2 μm
Dimensions (W × H × D) 2.1 × 1.6 × 2.5 in (52.5 × 39.4 × 64.1 mm)
Cable length 6 ft (2 m)
Weight 0.5 lb (0.2 kg)
Sensor Module connector close-up showing the eight camera positions, numbered 0 through 7 in two rows of four.
Figure 2 — Sensor Module camera ordering (ER-00014 Rev A, p. 9). Cameras are indexed 0–7 in software and arranged in two rows of four on the connector.

Laser
Laser classification Class 1
Wavelength 795 nm
Pulse duration 250–1000 μs
Pulse repetition rate 40 Hz
Average power 12 mW
Energy per pulse (at delivery fiber tip) 300–500 μJ

System architecture

The general system architecture connects the host PC to the Console over USB, and the Console to one or two Sensor Modules over paired electrical and optical links.

USB cable requirement

The USB cable must be a USB-A to USB-C cable and can only be sourced from Openwater (part number 100-00049). Substituting a generic cable can cause data integrity issues at full link speed.

Open-Motion system architecture: a Host Computer with system control, data processing, GUI, and data storage connects via USB HS to the Console; the Console contains the Console Board (system timing, laser drivers, safety circuits, AC/DC power converter) and Optical Components (laser butterfly package, 50:50 fiber splitter); the Console connects to two Wearable Sensor Modules via a multi-purpose cable carrying data, power, and light; each Sensor Module contains an Aggregator Board, eight camera sensors with FPGA, and laser delivery and diffuser optics; an external TTL device connects to the Console over an SMA cable for trigger and sync.
Figure 3 — Open-Motion system architecture (ER-00014 Rev A, p. 10).

System signals

Console signal pathways

Console internal signal pathways: AC power enters via the Power Entry Module and Power Switch, feeds an AC/DC Power Converter and the Console Control Module (STM32 MCU plus USB hub); a Host PC and External Device connect to the Control Module; the Control Module drives Status LEDs, the Fan, and laser electronics including a Seed Laser Driver Module, TA Laser Driver Module, Laser Safety Module, and Laser TEC Driver Module — each backed by a Lattice FPGA — which drive the Laser Butterfly Mount and a Fiber Splitter; the Multipurpose Cable to Sensor Modules carries the resulting power, signal, and optical paths.
Figure 4 — Console signal pathways (ER-00014 Rev A, p. 11). Color legend: optical, digital signal (I2C), high-speed data, power, analog signal, trigger/sync.

The Console signal pathways cover:

  • USB host communication
  • Sensor Module electrical and optical interfaces
  • Laser control and safety interlocks
  • SMA trigger input/output paths
  • Status LED control

Sensor Module signal pathways

Sensor Module signal pathways: the multipurpose cable from the Console carries power, high-speed data, and optical signals into the module; an Aggregator PCBA hosting an STM32 MCU receives data from two Camera Assemblies (eight cameras per Sensor Module total); each Camera Assembly contains a Camera PCBA with a Lattice FPGA, a Camera Sensor, and Camera Optics; an optical Diffuser Assembly distributes the laser delivery from the Console.
Figure 5 — Sensor Module signal pathways (ER-00014 Rev A, p. 12). Color legend: optical, digital signal (I2C), high-speed data, power, analog signal, trigger/sync.

The Sensor Module signal pathways cover:

  • Camera SPI inputs (8 cameras per module)
  • Aggregation logic
  • USB high-speed output to the Console
  • Internal clocking and frame sync

Next: Software Development for tech stack, architecture, and the firmware/host/test layers.