An oscilloscope is an electronic measuring instrument used to visualize electrical waveforms by displaying voltage variations over time on X and Y axes. It helps engineers and students analyze, troubleshoot, and test electronic circuits with accuracy.

This project presents a Wearable Smart Oscilloscope Watch, a compact and portable oscilloscope integrated into a wristband. Unlike conventional desktop oscilloscopes, this device allows users to monitor low-frequency electrical signals anytime and anywhere, making it highly useful for educational, laboratory, and field-testing applications.

The system is powered by a rechargeable lithium battery and includes an intelligent battery management circuit for safe charging, battery level monitoring, overcharge protection, and low-battery indication. This ensures reliable operation while increasing battery life.

The oscilloscope is designed to measure DC and low-frequency AC signals up to 20 kHz with a sampling rate of approximately 50,000 samples per second (50 kSPS). The captured analog waveform is processed and displayed on a compact 0.96-inch OLED display, providing a clear real-time visualization of the input signal.

Signal conditioning is achieved using the LM358 dual operational amplifier, which amplifies and shifts the input waveform to match the operating voltage range of the microcontroller. Since the circuit operates from a single power supply, a reference voltage is generated to center the input signal. A 100 kΩ potentiometer is provided to adjust the DC offset, while a fixed gain stage improves signal visibility.

The Arduino Nano acts as the main controller, continuously sampling the conditioned signal, processing the data, and displaying the waveform on the OLED display through the I²C communication interface (SDA and SCL). User push buttons are included to modify oscilloscope settings such as display mode and measurement parameters.

By combining portability, low power consumption, and real-time waveform visualization, this wearable oscilloscope offers an affordable solution for students, electronics enthusiasts, and engineers who require quick signal analysis without carrying bulky laboratory equipment.