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Heart Rate Monitor and Data Acquisition System. Senior Design Project University of Illinois Bill Leece and Sofoklis Nikiforos. Introduction. Design an ECG Display heart beat Display heart rate Count Calories. Motivation. Interest in Digital and Analog Electronics
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Heart Rate Monitor and Data Acquisition System Senior Design Project University of Illinois Bill Leece and Sofoklis Nikiforos
Introduction • Design an ECG • Display heart beat • Display heart rate • Count Calories
Motivation • Interest in Digital and Analog Electronics • Interest, but not necessarily experience, in Bioengineering • Bill will be doing circuit design for pacemakers with Medtronic in the fall • Nick is considering Bioengineering courses
Overview • Design considerations • Hardware • Software • Strengths and Weaknesses • Cost Analysis
Design Specifics • Biopotential electrodes • Amplifier circuit • PC interface via DAQ • LabVIEW software
Hardware Diagram Right Leg Circuit Input from Right Leg Pre Amp Bandpass Filter and Power Amplifier Input from Electrodes Output to PC
ECG Characteristics • Preamplifier • Low gain • Eliminates unwanted signals (interference) • Driven Right Leg Circuit • Minimizes interference • Electrically safe for patient
ECG Characteristics (Cont.) • Power Amplifier and Bandpass Filter • Industry standards are set at 0.05Hz-150Hz • Amplification is essential in order to record the signal to a recorder • Output to PC • The analog signal is sent to the PC via the DAQ • LabVIEW software performs signal analysis on data it receives from the DAQ
LabVIEW Software • Graphical Programming Language • Useful for Data Acquisition • Easy to Debug
Heart Rate Monitor Front Panel • Enter age, weight, and resting heart rate • The Heart Rate Monitor Front Panel VI outputs the user’s maximum and minimum target heart rate needed for maximum calorie burning during exercise • The age and weight data is then sent to the ECG subVI
ECG • Displays ECG data • User controls sampling rate • Displays BPM and calories burned • Problems encountered
Timing Circuit • Used to keep time for BPM calculations • Makes sure that the program keeps real world time • Problems encountered
Counter • Counts rising edges of ECG pulse for BPM calculations • Uses signal averaging to accurately count noisy signals • Problems encountered • Now lets look at a cost analysis of this project…
Prototype Cost Analysis • Case (Chassis) $ 10 • Printed Circuit Board $ 100 • OpAmps $ 5 • Resistors, Capacitors, Etc. $ 5 • Software (LabVIEW 5.1) $ 995 • NI-DAQ $ 795_ • Total Parts Cost $1,810
Conclusion • Strengths and Weaknesses • Areas that could be improved • Questions?