Digital tachometer

[rynr]

I did it last year for pass microprocessors systems class on university. I realized I don't need speedometer, so tachometer in not necessary too - i don't use it anyway :)

Here's a video :)

http://www.youtube.com/watch?v=PYI393bxp9A

[cayuse]

cool! Can you post a schematic?

[rynr]

http://www.sendspace.com/file/xiv8fs
here's pdf in Polish.

Tachometer is based on atmega microprocessors (programmed with code done in C - haven't got already). This project is quite simple, made sooo wrong, but it works somehow :).

It counts time between impulses from engine (interrupter(?)) and display it in rpm x10.