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Computer Angels Self-built alternative communication

Pointing and access

Sguardo

Eye pointing with low-cost hardware

An infrared bar and eye-tracking software: the pointer follows the gaze, selection happens by dwell or with a switch.

  • Single switch
  • Eye gaze
€ 320 self-production contribution, screen mount included
Made to order

Description

Commercial eye-tracking systems for communication cost as much as a used car and are often tied to a single piece of software. Sguardo combines a self-built infrared bar with an open tracker, at an accuracy suited to communication grids of 6 to 30 cells: it is not meant for precision drawing, it is meant for talking.

Calibration with 5 or 9 points takes under a minute and is saved per person, so it need not be repeated at every start-up. Selection can be made by dwell, with progressive visual feedback, or with an external switch — often preferable, because it markedly reduces unintended selections while exploring the screen.

Image processing happens entirely locally and no frame is ever stored or transmitted.

Who it is for

People with no useful limb or head control, with preserved eye movement and a head posture stable enough to work with.

Features

Calibration in a minute

5 or 9 points, profile saved per person.

Dwell or switch selection

An external switch cuts unintended selections.

Communication-grade accuracy

Suited to grids of 6 to 30 cells.

No images stored

Local processing, no frame kept.

Screen mount included

Adjustable bracket for 15 to 27 inch monitors.

Movement tolerance

Automatic recovery within ±8 cm of head movement.

Technical specifications

Performance

Typical accuracy1.1-1.8° depending on calibration
Rate60 Hz
Working distance50-75 cm
Head movement tolerance±8 cm with automatic recovery

Hardware

Illuminators2 × 850 nm infrared LEDs, power within IEC 62471 exempt group
SensorMonochrome global shutter camera, 640×480
ConnectionUSB 2.0, bus powered
MountingMagnetic bracket for 15-27" monitors

Software

SelectionDwell 0.4-3 s, external switch, blink
Requirements4-core CPU, 8 GB RAM

Limitations

Not suitable forMarked nystagmus, strong photophobia, very thick glasses

Supported access methods

How the person operates the aid. If the method you need is not listed, write to us: it is often just a matter of an adaptation.

Request information

Tell us what you need and where the aid would be used: we reply with a concrete proposal, and if this is not the right product we say so.

The catalogue handles no payments: this is an enquiry, not an order.

Enquiry aboutSguardo

This is where we reply.

Only if you would rather be called back.

Tell us about the situation: which movements are possible, in what setting (home, school, work), with what goal.

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