Obstacle Detector at Head Level

摘要

In this paper, the design, manufacturing process and testing of a device able to detect obstacles at headlevel is presented. The device’s functionality is based on emission and detection of infrared light andthe tactile stimulus. The design was performed in order to detect objects, from the head and up to 150cm away. The fabrication was done using both an infrared emitter and detector with a 940 nmwavelength; for the signals processing a commercial LM567 Texas Instruments? chip was used. Testswere performed on closed and open spaces, obtaining tactile response with objects placed at 150 cmon closed spaces and placed at 100 cm in open spaces. To further improve the device’s performanceon open spaces an optical filter was used on the phototransistor.