Abstract

HERRERA VELASQUEZ, Alejandro  and  JARAMILLO MORALES, Roberto. DISEÑO Y CONSTRUCCIÓN DE UN DISPOSITIVO PARA LA ALERTA DE OBSTÁCULOS (DAO). Rev. ing. biomed. [online]. 2007, vol.1, n.1, pp.23-27. ISSN 1909-9762.

This paper presents the development of a portable electronic device for blind people. It is composed of an ultrasonic pair (emitter-receiver), and lead by a microcontroller. First, an emitter block generates ultrasonic waves that are reflected after they had collided with an obstacle. The reflected signal is captured by the receiver. The signal is then amplified, and after a threshold comparison is made by the microcontroller, an output is carried to the motor of a vibrator located in the patient's waist. The systems block diagram, the programming logic, the mechanical design, and the electrical circuit schematics are presented.

Keywords : Visual disability; Echo; Blindness; Microcontroller; Ultrasonic transducers.

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