The study focused on the design and development of Oil Sentry, an environmentally friendly, fully automated device that uses Arduino Uno technology to improve oil spill detection and collection. It was intended as a preventive measure against the harmful effects of oil spills on water- based ecosystems, specifically the coastal areas of the Davao Gulf. Oil Sentry integrates a motorized suction system for oil removal, an infrared sensor for oil detection, and a GPS-based navigation system for surface movement. An obstacle detection mechanism was also incorporated to ensure safe and efficient operation during cleanup. The device underwent laboratory testing to evaluate suction capacity, performance efficiency, detection accuracy, and navigation stability. Results showed that Oil Sentry accurately detected and collected oil while maintaining stable movement on the water surface. The system demonstrated effective navigation with minimal water disturbance, highlighting the potential of robotic solutions for marine environmental sustainability applications.