DIGITAL WRIST SPHYGMOMANOMETER WITH AUDIO ALERTS FOR ABNORMAL BLOOD PRESSURE DETECTION

Abstract

Monitoring blood pressure regularly is essential for the early detection of abnormalities such as hypertension and hypotension. This study presents the design and development of a wrist-based digital sphygmomanometer equipped with an audio alert system to indicate abnormal blood pressure conditions. The device uses an MPS20N0040D-S pressure sensor to measure cuff pressure, controlled by an Arduino Nano microcontroller, and displays the measurement results on a Nextion LCD. A buzzer is integrated as an audio indicator when systolic or diastolic values exceed predefined thresholds. Performance evaluation was conducted by comparing the device readings with a calibrated NIBP simulator under three conditions: low, standard, and high blood pressure. The results show an average accuracy of 93.66% for systolic pressure, 83.29% for diastolic pressure, and 99.47% for heart rate (BPM). These findings demonstrate that the proposed wrist-based sphygmomanometer can serve as a practical and accessible tool for preliminary blood pressure monitoring