arduinoTime:
Could I use the code here Arduino Tachometer - Software | PyroElectro - News, Projects & Tutorials for the IR reflective sensor? I want to measure RPM like this (http://www.stumbleupon.com/su/9XvNYO/embedded-lab.com/blog?p=2425) but the site used a different controller. Also, could you suggest an IR module from sparkfun that I could use for this project?
As I said-
It could work with the first one, too. It's just a matter of how reflective the surface is. It needs to be so reflective that the bounced
me:
light is intense enough to register as logic level. I doubt using the adc is an option-it's too slow for this purpose. Using an opamp (or a transistor) would be pretty simple if the light levels are too low.
I have never bought anything from Sparkfun and have never done this before, either (actually, I've done stuff with beam interrupt for rpm measuring, but not with reflective surfaces). I don't wanna recommend something that might not work.