Dear everyone!
My project is to make a blood leakage detector for dialyzer. I plan to use optical sensors and arduino uno to sense the leakage of blood and if leakage occurred, a buzzer will give me an alarm.
Is there anyone who can help me to make this circuit and to write the code with Arduino IDE?
Thanks if anyone can help.
This forum is not generally a code writing service unless you are willing to pay for it. Rather the forum provides help to people with code and/or hardware problems
Having said that, there is a forum section to request paid help. Would you like this topic moved there or are you going to try yourself and get help here ?
Arduinos are not certified, approved for such serious matters. Failure in the project can affect the well being of the patient. Medical equipment like that must have a very high reliability and is absolutely wrong for a hobbyist that can't even design it.
Notwithstanding the criticisms of mission critical projects, I am wondering just how and where this leakage may be occurring and therefore how you actually propose to detect it? 
This is clearly a school type project.
I could guess you are attempting to measure something like the optical density of fluid passing through a tube or maybe similar.
Have you already chosen a sensor for this ?
A leak may happen if the filtering membrane is damaged: you don't want to dialyze the erythrocytes away.
AFAIK it is detected by a red light absorbtion (or reflection?) in the used dialysate.
I guess it is a homework - this is probably the simplest task in the whole device.
yes. It is a coursework project. Yes, either using photocell or optical sensor. Haven't decided yet. Do you have any suggestions for the sensor?
Yes. And interruption of the light transmission by blood cell will trigger the alarm.
Out of curiosity, is your course weighted towards medicine/biology or is it weighted towards electronics/embedded systems ?
I am taking bachelor of Biomedical Engineering. Both aspects are significant.
So it is an in depth study. The choice of sensor is critical for this and you have to spend some time looking at experiments and browsing through data sheets to determine suitable characteristics of such a sensor.
Generally speaking, once a sensor has been selected and the measurement characteristics understood and alarm trigger levels defined, the programming aspect is relatively simple.
Indeed, begs the question of what part if any, a microcontroller would have to play in it?
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