Hlp me making a tachometer with IR sensors...

I want to make a tachometer to measure rc aircraft propeller speeds.... Please guide me how do I make it with an arduino dumilaenove board and IR sensors....

Please help me with the code too..

Unless someone's feeling incredibly generous, I'm afraid you're unlikely to get what you're asking for.

Have you searched for similar projects at all? Can you post an idea of how it could work?

search google for arduino tachometer. there's code already in the playground there's also an instructable on it.

"Google it man...." :-/