Desarrollo de un prototipo de sensor inteligente de bajo costo para dispositivos de navegación de personas no videntes usando plataformas embebidas.

Abstract

In this titling work, the design and implementation of a low-cost intelligent sensor prototype for navigation devices of blind people using embedded platforms were carried out. Were established Several requirements for the development of the smart sensor based on the study of other ultrasonic sensors and the Eyeclip device which helps the blind people to their mobilization, among the most important are the dimensions, low current and voltage consumption that the sensor must-have. The prototype implemented had two transducers for the emission and reception of the ultrasonic pulses, but the operation and dimensions were not suitable for use in the Eyeclip device. The optimization of the intelligent sensor was based on the operation of the first prototype, for which it was decided to improve the algorithm of reception of ultrasonic pulses through an analysis of the signal received in Matlab, thus establishing a new algorithm that detects the first ultrasonic pulse received by the transducer to calculate the distance to the target, resulting in the final optimized prototype of intelligent sensor JA-002. From the implemented design, different field tests were carried out with various types of materials to be detected, such as wood, plastic, clothing and cardboard. By tabulating the measurements obtained, a measuring range of the smart sensor from 30 cm to 218 cm was obtained, which makes it ideal for use in devices that help the mobilization of blind people. Finally, it concludes that the intelligent sensor JA-002 implemented meets the requirements raised because it works with a voltage of 3.3V, a current of 4.8mA, has a low cost and uses a single transducer thus achieving the minimum possible sizing.