2026. Design of a Two-Axis Pointing Sensor System (Azimuth and Elevation) Based on Servo Motors Using HC-SR04 Ultrasonic Sensors as Part of the SEWACO Subsystem : Rancang Bangun Sistem Pointing Sensor Dua Sumbu (Azimut dan Elevasi) Berbasis Servo Motor Menggunakan Sensor Ultrasonik HC-SR04 sebagai Bagian dari Subsistem SEWACO . Procedia of Engineering and Life Science. 10, 1 (Oct. 2026), 701–712. DOI:https://doi.org/10.21070/pels.v10i1.2943.