Remote Pulse Monitoring System

[kaveena]

I'm engaging on this project called remote pulse monitoring system and using the pic18f452 and using TCRT1010[iRDA sensor] chip for the sensor control circuit. in summary, my project is to develop a low power consumption and portable measurement device which can provide continuous monitoring photoelectric plethysmography(ppg) of the user. this project will enable the patients to have their initial pulse rate taken at home.

the first part was a low power consumption PPG device with microcontroller. I'm having a problem regarding the coding, on how to convert analog signals to digital. Therefore, I' m looking for some sample reference templates to overcome this problem.

The program should be able to…
1. Read an analogue wave form
2. Has a threshold value to read the analogue wave.
3. Then convert to digital.
4. Then with the digital wave count the number of beats[HIGH]
5. and display it on LCD[in numerical value example: 60/min]

can anyone help???

[KenWittlief]

maybe its only a matter of the way you worded your question, but the PIC family of µC have analog to digital converters built in

so the software cannot really 'see' the analog values or signal. You set up the A to D converter to sample the analog data contininously, and then the software will have a stream of digital numbers coming in that represent the analog signal.

Then its up to your SW algorithm to look for zero crossings, peaks, ect in the data and determine what the frequency, amplitude, frequency content.... of the data is.