Composing Mini Oscilloscope on Embedded Systems

Abstract: In this paper, our goal is to reproduce the basic functionalities of a regular oscilloscope, using the Nuvoton NUC-140 embedded systems development platform as the front-end and display method. A custom-built daughter board connects the NUC-140 to a variety of peripherals, including two BNC scope-probe connections, an external nine-button keypad, and a calibration signal. The LCD of the NUC-140 development board serves as the waveform display. From the experimental results, it is demonstrated that our proposed system became a very competent debugging tool. It implements 90% of the features we typically use on original oscilloscopes, including: automatic, edge-triggered, and single modes; waveform visualization using vertical and horizontal scaling; probe calibration.