Design of Bluetooth Compatible Temperature and Photoplethysmogram (PPG) Monitoring System

A Bluetooth Compatible Temperature and Photoplethysmogram (PPG) Monitoring System is designed to allow continuous monitoring of body temperature and heart beat per minute (BPM) of the user. The system is specifically designed to all Bluetooth compatible Android device user to convenient the user and to alert the responsible person when an emergency happens especially to the patient or the elderly. The system integrates both Digital Temperature sensor (DS1820) and Photoplethysmogam pulse sensor using Arduino and sends all the detected information to the Android device via the Bluetooth Module (HC-06). All the data that send using the system have all verified by using another certified Digital Thermometer and OMRON HEM-7203 Automated Blood Pressure Monitor. Under the optimal condition where the sensors have successfully detected the information, the percentage error of temperature and beat per minute are 1.92% and 4.44% respectively. For temperature, the percentage error is caused mainly because the DS1820 have ±0.5℃ increment while the temperature sensor has ±0.1℃ increment. Also, DS1820 does not have a proper temperature insulation to the surrounding. For heart pulses, the system displayed almost perfect plotting of PPG data, however, the comparison of BPM does not seem to be perfect because the OMRON Blood Pressure Monitor using the different concept to detect a pulse