Analog data transfer from serial port at different resolution

Abstract

. Making an analog data transferred into computer as the closest form to its actual value is related with the resolution of ADC (Analog Digital Converter). When the resolution is increased, the loss in data intake is decreasing. In order to transfer digital data on ADC output that has got the intended resolution, there are three different equipment on the computer as parallel, serial and USB port. In this study, it is aimed to transfer and record the change of analog data coming from any sensor with using serial port of the computer by way of user-controlled synchronous serial transmission. The analog data that will be recorded in the study are taken from UGN3177 Hall effect sensor. This analog data’s input to one of ADCs which have got 8,12,14 bit resolution is provided by PIC18F4520 microcontroller controlled multiplexer. After that, trigger signals required for the chosen ADC are given by microcontroller and the change of analog data to digital data is ensured and recorded. Also, digital data that has got 12 and 24 resolution is coded with PIC18F4520 microcontroller. A Visual Basic based program is written in order to answer the question that which coded data will be taken from serial port and to determine how fast it will be taken, to take data and to be able to observe data interchange. In this paper, operation of developed electronic cards and data intake program are discussed in detail.