Paper Title
SENSORLESS CONTROL OF BRUSHLESS DC (BLDC) MOTOR USING ARDUINO

Abstract
This study presents the design and implementation of a sensor less control system for a Brushless DC (BLDC) motor employing an Arduino UNO microcontroller, driver circuits, and MOSFET-based switching devices. The research aims to eliminate conventional position sensors by estimating rotor position through back electromotive force (back-EMF) detection in the stator windings. A virtual neutral point is generated and interfaced with an analog comparator to identify zero-crossing instants, thereby enabling accurate commutation control. The controller initiates motor operation using an open-loop starting sequence and subsequently transitions to a closed-loop back-EMF commutation technique, ensuring smooth and stable motor performance. This approach enhances efficiency, reduces hardware complexity, and improves system reliability while maintaining precise speed and torque control. The proposed architecture demonstrates that cost-effective sensor less operation of BLDC motors can be achieved using low-cost embedded platforms without compromising performance. Experimental validation confirms the feasibility and robustness of the developed system, highlighting its potential applicability in industrial automation, electric mobility, and energy-efficient household appliances. Keywords - Brushless DC Motor, Sensor less Control, Back-EMF, Arduino, PWM