BPM greater than 200 without touching the sensor

[ankitmathur45]

Hi guys,

I have purchased original pulse sensor from sparkfun and uploaded the code as it is on my Arduino Uno board. But the sensor gives me erroneous readings eg. BPM > 200 without even touching the sensor. On touching the reading is fine 50% of the time but erroneous values are frustrating. I have been pulling my hair for past week or so due to this issue. Any help will be really appreciated. Please respond ASAP.

[yury-g]

It sounds like you need some basic debugging.
Run this code and see how the Pulse Signal looks like in Arduino's built-in serial Monitor.
https://github.com/WorldFamousElectronics/PulseSensorStarterProject

My first guest is that your wiring is off. But you should see what kind of signal you have in the linked project. It will tell you quickly where the problem is.

Let us know.