Problems about the AFE4400 LED Configuration and denoising.

Sean XC

Other Parts Discussed in Thread: AFE4400

Hi,

I meet some problems when i use the AFE4400.The signal output is so small and with a lot of noise,I can only get the signal from the Red led,there are full of noise in the IR led signal.so

How to set the led current to get better signals?

How to choose the value of the Cpd?

over 9 years ago

0 Amy Schnoor over 9 years ago

TI__Mastermind 18275 points

Sean,

Are you using our EVM? If so, are you also using our GUI? Could you possibly send us a screen shot of your noisy signal?

0 Sean XC over 9 years ago in reply to Amy Schnoor

Prodigy 20 points

Thank you,Amy.

I use my own board according to Ti refference.The following figure is the signal i get.The it's not the real PPG signal,Why is the second vally lower than the first one(in the same cardiac period)?

Best Regards.

0 Amy Schnoor over 9 years ago in reply to Sean XC

TI__Mastermind 18275 points

Sean,

There are a few things that contribute to HRV (heart rate variability). Anything from physical activity, stress, etc. It doesn't look like you have much variability and your signal looks very good.

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Problems about the AFE4400 LED Configuration and denoising.