Uma interface lab-made para aquisição de sinais analógicos instrumentais via porta paralela do microcomputador

AUTOR(ES)

Gaião, Edvaldo da Nóbrega, Medeiros, Everaldo Paulo de, Lyra, Wellington da Silva, Moreira, Pablo Nogueira Teles, Silva, Edvan Cirino da, Araújo, Mário César Ugulino de

FONTE

Química Nova

DATA DE PUBLICAÇÃO

2004-10

RESUMO

A lab-made interface for acquisition of instrumental analog signals between 0 and 5 V at a frequency up to 670 kHz at the parallel port of a microcomputer is described. Since it uses few and small components, it was built into the connector of a printer parallel cable. Its performance was evaluated by monitoring the signals of four different instruments and similar analytical curves were obtained with the interface and from readings from the instrument' displays. Because the components are cheap (~U$35,00) and easy to get, the proposed interface is a simple and economical alternative for data acquisition in small laboratories for routine work, research and teaching.

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