The Oxford Optical Pointer: a direction-sensing device with proportional electrical output

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For some disabled people pointing provides a more convenient means of communication and control than the use of switches. The quadriplegic who retains good control of head movement can be provided with a number of input alternatives, but no existing system meets all the requirements of a general-purpose electronic pointing device. Consequently the Oxford Optical Pointer has been developed. The principle by which it converts relative direction into analogue electrical signals is described and its application as a head-mounted device for controlling an electric wheelchair is presented.
Original languageEnglish
Pages (from-to)68-74
Number of pages7
JournalMedical and Biological Engineering and Computing
Issue number68
Publication statusPublished - Jan 1988


  • direction sensor
  • head control
  • infra-red
  • joystick emulator
  • photo quadrant detector
  • proportional input device

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