How do I use the KY-039 sensor?

Other Hardware Sensors
7

I had the same question and it seemed most people said this sensor module just doesn't work.

I fooled around with the connections and managed to make a blob pulse according to my pulse with processing.
(it's quite subtle but it's mostly in synch with my pulse)

Arduino Code:
I used the one recommended earlier in this thread
http://www.ebay.co.uk/itm/NEW-KY-039-Finger-Measuring-Heartbeat-Sensor-Module-for-Arduino-/331127966386

Made a simple Processsing code:
(I'm a beginner, pls advise if something's off ^^;)

void setup(){
myPort = new Serial(this, Serial.list()[6], 115200);
size(300, 300);
background(0);
noStroke();
smooth();
}

void draw() {

while (myPort.available() > 30) {
int inByte = myPort.read();
println(inByte);

if(inByte>35){
ellipse(width/2, height/2, inByte2, inByte2);
}
else{
background(0);
}
}
}

Connections:
Most importantly, I connected the A0 to the S pin & Ground to - pin.
Leaving out the whole 5V all together. (why, I hv no clue. the pin fell out and it worked better without too much flickering)