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 [Internet]. 2026 Oct. 16 [cited 2026 Oct. 24];10(1):701-12. Available from: https://pels.umsida.ac.id/index.php/PELS/article/view/2943