Hello !
I am using the above sensor with two LED to make beat detection based on optic sensor.
But this sensor is returning me number of RISING interrupts for some time I define.
How to interprete these data in order to find the bpm ?
Please supply the code.
Weedpharma
I am actually using this example as a base:
http://playground.arduino.cc/Main/TSL235R
But what I can't get is how to convert that into bpm.
Any guidance or something from someone that actually did it before ?
That code was never intended to be used for heartbeat rate. you should at least increase the frequency of sampling.
change
if (millis() - last >= 1000)
in
if (millis() - last >= 100)
and you will have 10x as much samples (600 per minute). That should be sufficient to see a variation that can be interpreted as the heartbeat
Can you post one minute of the output after the above modification?
please use [code]..[/code] tags around the output
The deltas are very small but if you copy this to Excel an make an XY plot.
you can see 36 beats in 350 samples ~~ 1 beat per second.
now please use
if (millis() - last >= 250)
that should make the deltas bigger