Návrh kompaktnej dosky plošných spojov pre presné snímanie analógového vstupu

Abstract

The article deals with the design and implementation of a measurement system intended for accurate detection of linear displacement in the braking mechanism during brake lining testing. The measurement is carried out using the analogue sensor Larm LS501, whose output, due to the mechanical design, utilizes 40% of the available measurement range. The signal from the sensor is converted into digital form using a 16-bit ADS1115 analogue-to-digital converter, which allows obtaining approximately 13,107 measurement increments over a total displacement of 400 mm. The resulting measurement resolution is approximately 0.0305 mm per increment. The system is controlled by an ATmega328P processing unit implemented as an Arduino Nano module, which provides data processing and communication via the I²C interface. The electronic part is realized on a two-layer printed circuit board with dimensions of 90 × 45 mm, which, in addition to the processor and converter, includes power and filtering components, input connectors, and four additional analogue channels available in 10-bit resolution. The proposed solution provides a compact, easily serviceable, and cost-effective system for precise linear displacement measurement in a brake inertia test stand.