New guy here!
I need some help, i want to make an acoustic RMP meter to measur the RPM of a model airplane engine. (with sound)
I been googling arround and found this:
Arduino Frequency Counter Library
thought I could use this, with a mic, and it would be pice of cake!
I cant get the mic to give me a "digital output" - from what i read it means that the output must swap between 0v and 5v (for the arduino to accept high and low). ??
To test the lib i then put together a lm555 (timer) to make some square pulses (that swap between 0V and 5v).
Nor can I get that to work!
so help me out here - if you have another idea on how to do it pleas dont be shy, telle me
I know the RPM of the engine is arround 500hz, and when i plan on using it, it will be so close to the engien, that I dont think it needs any filters (since the engien will be the only thing it will "hear")