hello!
I have a project of logic probe simply, but i want to use it to accsess the circuit cury as wel as the to detact the pulseof human and count it, if it <72 than he han low ,and if >72 then he have high.
now i made the circuit for the logic probe,but for the detection of very light pulse of heart we need a sensor that detect this light pulse.i think we can use here the cystal microphone but if it is not available than what is its alternate sensor or detective of light pulse.