Heart Rate Monitoring using Injection Locked PLL Resonator and Microcontroller

Monitoring vital patient signs using pulse rate, with integration of technology for better future. Phase Locked Loop (PLL) device is combined with embedded wrist for measuring heart rate for stabilized values. Depending on readings in accordance with predefined values, if there is difference in value then ADC and microcontroller is used for RF(radio frequency) sensors to activate for encryption and decryption of information to small devices like mobiles. Mostly heart attacks are caused during sleep in night time. Monitoring heart during sleep and before sleep, after sleep is essential. The sensor is kept 0.3 to 1 mm distance from the skin near carpus under the clothes made of fabric of cotton. The pulse of wrist is taken to a portable piezo-electric transducer. These are taken for further values and messages to phone are used using GSM and Bluetooth. Index Terms— heart rate, radio frequency, sleep, wearable sensors, wrist pulse, Internet of things, GSM, Bluetooth.