  The present paper describes the design of a cost effective, better resolution
data acquisition system (DAS) which is compatible to most of the PC and
laptops. A low cost DAS has been designed using PIC12F675 having 4-channel
analog input with 10-bit resolution for the monitoring of slowly varying
signals. The DAS so designed is interfaced to the serial port of the PC.
Firmware is written in Basic using Oshonsoft PIC IDE and burn to the
microcontroller by using PICkit2 programmer. An application program is also
developed using Visual Basic 6 which allows to display the waveform of the
signal(s) and simultaneously the data also can be saved into the hard disk of
the computer for future use and analysis.
