/diy/ - Do It Yourself

>>1395312
>>forget the arduino.
>Why do you even answer?

coz you're such a dumbass noob that you dont realize that, if the signal is dirty, then you cant trust what a digital counter says. you dont know what it's triggering from. but if you can see the waveform you can use your tiny brain to distinguish the fundamental frequency from the ringing and the noise.