M Raya Khashi Hega, Zulhipni Reno Saputra and Syarifah Aini 2026. XCLK Frequency Optimization on ESP32-CAM and Telegram-Based Smart Doorbell Systems. JURNAL TEKNOLOGI DAN OPEN SOURCE. 9, 1 (Jun. 2026), 512 - 522. DOI:https://doi.org/10.36378/jtos.v9i1.5208.