On a sunny day (24 Jun 2018 04:33:44 GMT) it happened Robert Riches
 wrote in :

>Has anyone interfaced a pulse oximeter or breathing sensor to a
>Raspberry Pi?  A Pi would be seem to be a natural for recording
>either or both measurements.
>
>Thanks.

It would work,
but the Pi needs quite a bit of power,
and then needs battery backup if it is life critical.

I am using a Microchip PIC to write radiation levels and GPS location to
SDcard,
powered from a small lipo, uses hardly any power, runs on a charge all day
long,
and is smaller than a raspberry + batteries + GPS + radiation sensor.
Not so easy to design and write the asm code:
 http://panteltje.com/panteltje/pic/gm_pic2/
has been on 24/7, still uses same battery since May 2014 ;-)
Some people do not believe you can recharge lipos that often.
I use it as alarm clock (not logging).

But if your thing just sits on a table and is not power critical,
then raspi is OK I think.
And then you can use whatever language Pi supports...

I am using a Pi to log AIS ship data, position, airpressure, CO level,
and lot of other things:
 http://panteltje.com/panteltje/xgpspc/index.html
also on 24/7
Website needs to be updated, thing looks totally different now...
logs air traffic too..

In the end it all depends on you and what you can and want to do.

--- SoupGate-Win32 v1.05