I'm following this project: http://arduinoprojects101.com/arduino-rpm-counter-tachometer/ and everything is set up. However, when I move my finger through the IR sensor TWICE, it displays RPM=58. That does not make sense to me. Shouldn't it display RPM = 1?
Is there something wrong with the code on that page? If so, what should I edit? I've already read the comments there and two people mention to change volatile byte rpmcount; to volatile int rpmcount; to be able to count a higher number of RPM, so I've done that. What else needs to be edited to fix this so the RPM is correct?
I'm a newbie to Arduino so any help is appreciated!