Hello,
I am a computer science student in final year(the project year 
). Our project is a patient monitoring system (PMS) which does two things:
1.Gets glucose level by analysing urine strip test.
2.Shows ECG waveform on phone screen by reading signal from external device,does a few calculations
& comparisons(based on signal intervals like pr, amplitude of qrs complex etc. )
I need some guidance on the second one.We were basically toying around with the first part of the project and have it figured.But the concept of external device and signal processing is still pretty vague.I heard about arduino yesterday and was wondering about how to use it here.Any help would be much appreciated as our deadline is next month.