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I found many complex circuit design.Is there a simple circuit that you will recommend?
The simple answer, if you want it to actually work and provide accurate blood oxygen percent readings, is... you can't.... How can I make a simple pulse oximeter not using microprocessor? ... .
You are kidding me, right? This is homework, so go find your own circuit schematic(s). All I did in the previous post was outline an analog approach. If I were to build an analog pulse oximeter, I would start from scratch and use the latest analog devices available. Well, actually, I wouldn't even attempt to build an analog-only pulse oximeter. It would definitely have a microprocessor. And to top it off, why bother? I already own a commercial pulse oximeter that measures and displays my pulse rate and percentage of blood oxygen and runs on two AAA dry cells. I don't believe in re-inventing wheels that someone else has perfected and made commercially available at reasonable prices... unless it is part of a learning experience. So, go learn some stuff.Can you share the circuit schematic?