  A low cost PC based real time data logging system can be used in the
laboratories for the measurement, monitoring and storage of the data for slowly
varying signals in science and engineering stream. This can be designed and
interfaced to the PCs Parallel Port, which is common to all desktop computers
or Personal Computers (PCs). By the use of this data logging system one can
monitor, measure and store data for slowly varying signals, which is hard to
visualise the signal waveforms by ordinary CRO (Cathode Ray Oscilloscope) and
DSO (Digital Storage Oscilloscope). The data so stored can be used for further
study and analysis. It can be used for a wide range of applications to monitor
and store data of temperature, humidity, light intensity, ECG signals etc. with
proper signal conditioning circuitry.
