Design And Development Of Ultra Low Power Embedded System For IoT Devices

Chua, Eng Seng (2017) Design And Development Of Ultra Low Power Embedded System For IoT Devices. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

There will be billions of IoT devices in the near future and each need to be powered up by a constant power supply,these devices will sooner or later be running out of power since most of the IoT devices are powered up by battery.Changing the battery supply constantly will need many resources such as manpower,capital and time.The Ultra Low Power (ULP) properties allow system to work for longer hours and hence this decreases the maintenance time.Due to increasing of IoT wearables in the medical fields,the embedded system will be built based on the medical application especially the Cognitive Heart Failure (CHF) since it is the number one killer among other diseases according to the World Health Organization (WHO).To allow long term monitoring of the patient with CHF,the ULP Electrocardiogram (ECG) Embedded System is designed and developed.Different ULP Microcontroller (MCU) that are available in the market are being compared and the DA14580 basic development kit with low current consumption is chosen to be connected with the AD8232 module to capture ECG signal and thus sending the ECG values via Bluetooth Low Energy (BLE) to the android smartphone.ECG signal with different BLE sending rate and during different physical activity are compared and data obtained via Universal Asynchronous Receiver or Transmitter (UART) communication is analyzed.The current consumption is determined to validate the whole system. Lifetime of the embedded system is validated through the battery level measurement.The system is able to achieve a current consumption of 2.82 mA and an approximate power consumption of 356.48 mW.It is found that the battery level maintains at 37% for the next 2 hours after 3 hours of operation during extended sleep mode and able to last for 7 days continuously.This project demonstrates that the ULP ECG embedded system is developed and it is able to send the ECG values through BLE for ECG signal detection.

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