GSM-Enabled Real-Time Reminder System for Healthcare Applications in Low-Resource Environments

Timely medication intake and routine health monitoring are critical for patients with chronic conditions, especially in rural and low-resource environments where healthcare infrastructure is limited. Many existing digital reminder systems rely on smartphones and internet connectivity, which are not universally accessible. This project presents the design and implementation of a GSM-based patient reminder system that operates without internet or smartphone dependency. The system is built using an Arduino Nano, SIM800L GSM module, RTC (DS3231), keypad, LCD, and buzzer. Users can set reminder times and contact numbers via the keypad. At the scheduled time, the system sends an SMS alert and activates a buzzer, ensuring both remote and local notification. Testing confirms that the system delivers reliable, low-cost, and offline medication reminders suitable for deployment in rural healthcare settings. The system can be scaled or enhanced with sensor integration and cloud connectivity for broader healthcare applications.