NodeMCU + Pulse Sensor

Other Hardware Sensors
1

Good day! I am trying to make an online heart monitor using node mcu.

I am trying to make my pulse sensor work, but I don't know if it's working fine.

I found a same project here: .: NodeMCU ESP8266 12E WIFI Monitoring Heart Beat dan Suhu LM35 WEBSERVER

I am able to see values ranging from 400+ ~ 500+ but less than 600
Now, after connecting to the given ip address. The result was
BPM = 18
or
BPM = 24

Here's the code part for the pulse sensor:

  bpm = analogRead(AnalogIn);
   Serial.print("bpm = ");
  Serial.println(bpm);  
  if((bpm > 600)&&(x > 1)){
  x = 0;
  bpmx = bpmx + 1;
  }

else if((bpm < 600)&&(x < 1)){
  x = 2;
  }

Now from that code, I am thinking that the "600" is the threshold. Am I correct?
I think this is why i only have 18 bpm.

I am not quite sure about how this code works, why does he have to set x into 2?

2

omegatron20:
Now from that code, I am thinking that the "600" is the threshold. Am I correct?
I think this is why i only have 18 bpm.

It's obviously a threshold. Some things change when bmp > 600.

I am not quite sure about how this code works, why does he have to set x into 2?

You should be able to see that in the rest of the code.

By the way, heart rates of 18 to 24 beats per minute should set off alarm bells. I mean, you're measuring the heartbeat of a supposedly living human, right?