Hi!
Please share your knowledge upon my simple question here.
What are the criteria needed in selecting suitable clock frequency to driven my LEDs?
I have two LEDs, red and infrared. I want to design the digital LED driver; where the clock pulse is driven from the LabVIEW software. I'm using DAQPad 6016 which has 200kHz/scan but since this DAQ board is a multiplex one, so per channel it can only scan for 25kHz since I want to use up to 8 channels.
So;
1. should the clock frequency less than 25kHz or more?
2. what is the suitable time delay for the second LED (IR)?
Many thanks in advance!
For your answer see the book "Design of pulse oximeters" (Amazon.com: Design of Pulse Oximeters (Medical Science Series) (Series in Medical Physics and Biomedical Engineering) (9780750304672): John G. Webster: Books) and patents of Ohmega and Nellcor.Thank You MaxG For Your Help , can u please give me some information on how we derived the polynomial equation ?
Much Appreciated
kastella
Hi I have just built a pulse oximetre circuit and tested it and it is working fine. My problem now is to calculate the SpO2. I am using a 16F877A PIC and need help with the code. Can anyone pls help me. thanks
thx very much will have a look at it
hope it help
---------- Post added at 12:49 ---------- Previous post was at 12:40 ----------
hey please I have those note already i am more concern about the design of the probe .I got the LED that i am supose to use but i only have 2 wires while its 2 led on it so i m confuse on how will i switch the leds without a ground or how can i do it.
thx alot
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