Build a USB-Powered LC Measurement Equipment

Abstract

Accurate measurement of inductance and capacitance is a crucial concept in the design of electronics, testing circuits, and educational experiments. This thesis examines the development of an LC meter based on Arduino with affordable costs but reliable features. The LC meter makes use of an LM311 comparator that generates oscillations within its circuit depending on the inductance or capacitance of the inductor or capacitor being tested. The output of this frequency is then captured by the Arduino Nano microcontroller, which determines the value of the unknown component in real-time using resonance-based formulas.

Smooth switching between types of inductance or capacitance measurements can be achieved using a relay system. An I2C-enabled LCD clearly and accessibly shows results, and push buttons enable calibration, zero adjustment, and user interaction. The prototype shows reliable performance within standard measurement ranges, offering a low-cost, customizable, and portable solution.