Hello,
I am using the MAX30101 with it’s arduino library (https://github.com/sparkfun/SparkFun_MA … or_Library) and noticed that it only uses the IR LED’s data when checking if there is a heartbeat:
long irValue = particleSensor.getIR();
if (checkForBeat(irValue) == true)
So I decided to try using the Red LED data to sense the heartbeat instead by changing it to:
long rValue = particleSensor.getRed();
if (checkForBeat(rValue) == true)
Now it no longer outputs correct BPM after placing a finger and BPM and Average BPM stays 0. The same happens for the Green LED. I think it has something to do with the checkForBeat() function in the heartrate.cpp function in the library, this part to be exact:
if ((IR_AC_Max - IR_AC_Min) > 20 & (IR_AC_Max - IR_AC_Min) < 1000)
{
//Heart beat!!!
beatDetected = true;
}
}
Maybe the thresholds for (IR_AC_Max - IR_AC_Min) are different for Red and Green LED?
Can someone please help me out with this?