Displaying of Graphics on CRO through 8051 Microcontroller and Digital to Analog Converter

International Journal of Electronics and Communication Engineering

© 2016 by SSRG - IJECE Journal

Volume 3 Issue 5

Year of Publication : 2016

Authors : Chinni Krishna D, Shaheen SK, and Sridevi U

10.14445/23488549/IJECE-V3I5P101

How to Cite?

Chinni Krishna D, Shaheen SK, and Sridevi U, "Displaying of Graphics on CRO through 8051 Microcontroller and Digital to Analog Converter," SSRG International Journal of Electronics and Communication Engineering, vol. 3,  no. 5, pp. 1-6, 2016. Crossref, https://doi.org/10.14445/23488549/IJECE-V3I5P101

Abstract:

With a view to display various shapes and different types of characters on cathode ray oscilloscope through 8051 Microcontroller, 8255 programmable peripheral interface and Two 4-bit Digital to Analog Converters (DACs), an interfacing diagram was designed. The output of first 4-bit DAC is acting as a source of data for xaxis and the output of second 4-bit DAC is acting as a source of data for y-axis. The length of the scale varies in terms of digital inputs from 00 to 0FH on x axis and also on y axis. An assembly language program of 8051 Microcontroller was written and executed to determining analog output voltages VA and VB for all digital input combinations and the obtained outputs incremented systematically by increasing the digital inputs. Later, the outputs are connected to CRO through op-amps and written an assembly language program to transfer the data through port A of 8255 PPI. The characters A, M and the shapes Hexagonal and Circle were displayed in the present work. Due to 4-bit DACs, 24=16 outputs are possible for different digital input combinations from 00 to 0FH. For displaying more number of shapes and many characters, there is a need to enhance the digital inputs. To enhance the length of scale from 00 to FFH, one complete 8-bit port is connected to x- channel and another complete port to y- channel to display series of characters and many shapes on oscilloscope.

Keywords:

Microcontroller, Digital to Analog Converter, Interfacing, Graphics, Assembly language program, Time delay.

References:

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