REALIZATION OF A DIGITAL CHAOTIC OSCILLATOR BY USING A LOW COST MICROCONTROLLER

Abstract

This study addresses the in-detail steps to create a chaotic oscillator with continuous-time equations using microcontroller hardware with a little lower clock-frequency and narrower data bus, utilized at much lower hardware, software and algorithm development costs compared to chaotic oscillators developed using analog circuit components or a hardware-based software platform such as FPGA. For this purpose, a Lorenz chaotic oscillator with continuous-time nonlinear equations was selected. Lorenz t-domain equations were transformed into S-domain and Z-domain, respectively. After these transformations, a detailed flowchart was given to illustrate the steps required to implement the chaotic oscillator in the microcontroller. All the details derived were simulated by running simultaneous MATLAB-SIMULINK simulations. Besides, the performance of the discrete-time chaotic oscillator was executed in the PIC18F452 microcontroller, produced by the Microchip Technology Inc. and visualized in 1D and 2D graphs on an oscilloscope screen.