Desenvolvimento de um sistema de aquisição e armazenamento de dados microcontrolado

Abstract

The data acquisition systems are present in many studies, cooperating on collection, storage and analyses of data. On farming field, these systems are used in experiments of agricultural machines, soil characteristics study, as well as in other applications where data collection by sensors is needed. In the present study, a data acquisition system was developed. It includes nine channels to collect pulse data, three, to sensors PT100-type and one, to the connection of a load cell. The user interacts with the system by passing configuration parameters through a matrix keyboard and monitoring its operation through a liquid-crystal display. The collected data by the sensors were stored in a pen-drive-memory type, similar to a text-file to be processed later by an application developed for the Microsoft Windows platform. The developed application contained three basic functions: plot graphics and exhibit statistics in realtime, load data from a text-file generated by a collection, exhibit graphics, correlated statistic data and finally, generate two other files based on an original one. One contains the data in unit format of engineering and the other with statistics data for each existent replication in the file. To exemplify the system value in farming researches, the application includes the analysis of some predominant factors for the experiment of farming implements, such as wheeled skidding of a tractor vehicle, fuel consumption by a motor, power exert in a specific point, rotations and temperatures. A data collection of three types of sensors, assisted by the system, was done and it showed data accuracy and exactness.