“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 ”, PELS, vol. 10, no. 1, pp. 701–712, Oct. 2026, doi: 10.21070/pels.v10i1.2943.