Adam Sunusi Haruna, MutariHajara Ali, Ibrahim Alkasim. Development of an Age-Calibrated Automatic Heart Rate Monitoring System with Real-Time Alerts Using Arduino Microcontroller & GSM Module. JSIHS [Internet]. 2026 Mar. 31 [cited 2026 Oct. 20];4(1):19-27. Available from: https://fringeglobal.com/ojs/index.php/jsihs/article/view/development-of-an-agecalibrated-automatic-heart-rate-monitoring-