Desarrollo de un dispositivo de medición automática de temperatura corporal libre de contacto directo basado en sensor infrarrojo y con funciones de IOT para el control de acceso.

Abstract

The present degree work aims to implement a prototype of a direct contact free automatic body temperature measurement system based on an infrared sensor and with IoT functions for access control, composed of three modules. The first, body temperature measurement, is responsible for measuring the user's temperature from five centimeters away. The second module, for wireless communication and database, under the IEEE 802.11 protocol, establishes communication, connection and data exchange with local and remote access servers via GSM network. The third, automatic access control, through WLAN connectivity obtains information from the database to enable or block access based on the measured temperature. At the same time, this system presents a database with storage in the cloud developed on the Ubidots platform, which allows a record and supervision of the measurements captured, the time and the place where they were taken. This system was subjected to operational tests, determining that the prototype system when measuring body temperature is within the precision range of 􀀀0.3 ° C, the maximum wireless connection distance of the access control module is 15.4 meters. In data packet transfer tests, an efficiency of 99.40% was obtained, and in stability tests and system functionality 99.25%. It is concluded that the prototype of the system allows the automatic measurement of body temperature, recording of this information in a database and automatic access control based on the measured temperature. For future projects and research, the use of artificial vision with cameras is recommended to measure body temperature autonomously and reduce the response time with the use and use of other technology in microcontrollers and wireless communication cards.