The Voltlog: A Cheap Solution to Battery Monitoring

Students: Emanuel Barajas, Antonio Kassis

Faculty Mentor: Farid Farahmand

Engineering

College of Science, Technology, and Business

The Voltlog is a compact, Arduino-based voltage logger designed to monitor the performance of batteries under load. It measures voltages up to 30V with approximately 5% accuracy, making it ideal for observing how different loads impact battery performance over time. Users interact with The Voltlog through a user-friendly interface displayed on an LCD screen and navigated using physical buttons. The system allows selection of logging intervals at 1, 2, 5, 10, 15, 30, or 60 minutes. Voltage readings are stored in non-volatile FRAM, preserving data even when power is lost. Only one session can be stored at a time, emphasizing simplicity and reliability. The Voltlog features live data transmission and session-based export via a Bluetooth connection using the HC-05 module. Data is sent to a companion app that functions as a battery simulator, enabling users to visualize and analyze battery behavior under various load conditions. This project highlights efficient low-power embedded system design, user interface development, wireless communication, and practical application in energy monitoring. The Voltlog can be a valuable tool for electronics hobbyists, engineers, and researchers needing a portable and customizable voltage tracking solution.