Pulse Sensor

Hi guys, I wonder why I could not get a nice waveform ? I got rectangular waveform instead.

Any advice ?

Thanks !

I wonder why I could not get a nice waveform ?

I don't like guessing games, but I'm going to guess that your code is wrong, your sensor is defective/wired incorrectly, or that you are interpreting the results incorrectly.

Since you posted no code and no details about the sensor, that's the best I can do.

Vincent19:
Hi guys, I wonder why I could not get a nice waveform ? I got rectangular waveform instead.

Any advice ?

Looks like your sensor hardware is not fully working within its intended measuring range.

Only sometimes the signal is within the measuring range, and rest of the time the signal is at the upper end stop position of the range.

These are the codes I am using.

PulseSensorAmpd_Processing_1dot1.pde (6.26 KB)

PulseSensorAmped_Arduino_1dot2.ino (4.05 KB)