Multichannel Recorder for Low Frequency Signals: Application of Oscilloscope as Integrated Mobile Service for a Smartphone

Abstract

Data acquisition and processing are well known for some time. Many applications use powerful hardware to acquire, process, and visualize signal waveforms. But there are some applications that do not have to perform high resolution signal acquisition and process large amount of data, for example, low frequency applications of embedded design and applications for remote power grid monitoring. The paper describes special system for low frequency signal data sample acquisition, processing, and visualization implemented as a service on Android-based smart device. The service makes smart device functioning as an oscilloscope or arbitrary waveform generator which is accessible remotely through Bluetooth. The design respects low power consumption requirements, simplicity, and user friendliness in application design. Application scenario was implemented as wireless data acquisition system for power grid monitoring.

Protótipo De Um Hardware Educacional Portátil E De Baixo Custo Para O Ensino De Eletricidade E Eletrônica

“…Os trabalhos de Pilicita-Garrido e Cevallos-Duque ( 2019), e de Diniz et al (2017) tratam da criação de um dispositivo (sistema de monitoramento de energia e medidor digital de energia, respectivamente), porém utilizam sensores (não usados neste trabalho) para aquisição de dados e utilizaram microcontrolador PIC. Trabalhos como os de Kochlan et al (2016), Ruiz e Cardenas (2016) mostram o desenvolvimento de um osciloscópio portátil (ou similar), envolvendo alguns dos temas buscados nesse projeto de pesquisa: portabilidade, uso de smartphone, conexão bluetooth e de microcontroladores. Porém são soluções mais complexas e mais caras, que não seguem a ideia inicial desse trabalho.…”