Sustav za kontinuirano praćenje disanja kapacitivnom metodom

master's thesis

• Title (english): Capacitive-based system for continuous respiration monitoring
• Author: Toni Martinović
• Mentor: Hrvoje Džapo (mentor)
• Committee member: Hrvoje Džapo (predsjednik povjerenstva)
• Committee member: Mario Cifrek (član povjerenstva)
• Committee member: Darko Vasić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2015-07-08, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Computing
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering

Abstract

U ovom diplomskom radu prikazan je pregled metoda za praćenje disanja ispitanika. Pomoću elektrostatskih simulacija proučen je utjecaj geometrije elektroda kapacitivnog senzora na njegovu karakteristiku te je predložen oblik koji daje zadovoljavajuću osjetljivost i linearnost, uz istodobno postizanje malih dimenzija i jednostavnosti izrade. Karakteristika dobivena simulacijom uspoređena je s karakteristikom izmjerenom na izrađenom prototipu senzora. Opisane su komponente elektroničkog sustava koji omogućuje kontinuirano mjerenje kapaciteta senzora. Za mjerenje kapaciteta koristi se integrirani sklop AD7746 koji se odlikuje visokom razlučivošću mjerenja. Sustav se temelji na mikrokontroleru izrazito niske potrošnje MSP430FR5969, a za pohranjivanje podataka koristi se mikro SD kartica. Korisničko sučelje koje omogućuje konfiguraciju sustava i preuzimanje snimljenih podataka predstavlja Android aplikacija koja se izvodi na pametnom telefonu, a sa sustavom se povezuje putem Bluetooth LE modula RN4020. Posebna pažnja posvećena je niskoj potrošnji i kompaktnosti sustava pa su sve komponente, uključujući naponski regulator s prekidanjem struje i sklop za punjenje litijskih akumulatora, smještene na tiskanoj pločici dimenzija 42 mm x 24 mm. Razvijeni sustav postiže višednevnu autonomiju rada napajanjem iz Li-Po akumulatora kapaciteta 400 mAh.

Abstract (english)

A short overview of respiration monitoring methods has been presented in this master thesis. The influence of geometry of capacitive sensor electrodes on its characteristics was examined by means of electrostatic simulations and the format that achieves sufficient sensitivity and linearity was proposed, with additional benefit of being small and easy to produce. The characteristic obtained by simulation was compared to the characteristic measured on the sensor prototype. Components of the electronic system were chosen to allow continuous measurement of the sensor capacitance. The capacitance is measured by AD7746 integrated circuit, which provides high measurements resolution. The system is based on an ultra low power MSP430FR5969 microcontroller, and a Micro SD card is used for data storage. A user interface that allows system configuration and downloading recorded data is presented through an Android application running on a smartphone, which connects to the system via RN4020 Bluetooth LE module. Particular attention was paid to low power consumption and system compactness so all the components, including switching voltage regulator and integrated circuit for charging lithium batteries, are placed on a printed circuit board as small as 42 mm x 24 mm. The developed system can run continuously for several days powered by a single 400 mAh Li Po battery.

• Keywords: praćenje disanja; kapacitivni senzor; mjerenje kapaciteta; AD7746; MSP430; RN4020; Bluetooth LE; FatFs
• Keywords (english): respiration monitoring; capacitive sensor; capacitance measurement; AD7746; MSP430; RN4020; Bluetooth LE; FatFs
• Language: croatian
• URN:NBN: urn:nbn:hr:168:047262
• Study programme: Title: Electrical Engineering and Information Technology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka elektrotehnike i informacijske tehnologije (magistar/magistra inženjer/inženjerka elektrotehnike i informacijske tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2018-02-06 10:30:45