Design and Implementation of a Portable Smart Oscilloscope with Android Interface for Lab Applications

Abstract

This study presents the design, development, and formative evaluation of a portable smart digital oscilloscope prototype, intended to address limited access to diagnostic tools in electronics laboratories within Technical and Vocational Education and Training (TVET) institutions. Built with a Raspberry Pi Pico microcontroller and the Scoppy Android application, the device enables real-time waveform visualization through mobile integration at low cost. A design-based development approach guided the construction, functional testing, and usability evaluation. Functional testing using standard waveform inputs demonstrated stable signal rendering, low latency, and adequate responsiveness for foundational electronics instruction. Usability was evaluated with 30 diploma students using a modified instrument adapted from the System Usability Scale (SUS) and Technology Acceptance Model (TAM), validated through expert review and pilot testing. The results confirm the feasibility and educational relevance of the prototype in supporting student-centered, mobile-assisted learning. Future work will expand testing across institutions and explore integration with structured teaching materials to maximize pedagogical impact.