Connecting KORG TM-40 tuner to the microcontroller...

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Hello,

My question concerns KORG guitar tuner TM-40. I would like to measure by the tuner frequencies from the microcontroller. (square signal) Question is what can handle an input of the Korg tuner? From wikipedia I found guitars can pick up even up to 10 Volts which would be ok for 5V atmega but wikipedia also says guitars usually gives no more than 1 Volt.
So the question is: Would be safe for my tuner to provide signal to the input of magnitude 5 Volts?

http://en.wikipedia.org/wiki/Pic...(music_technology)

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Can you describe what you want to do? The guitar pickup is an output to the tuner. The tuner measures the frequency of the string vibration. The tuner doesnt generate a frequency (usually). Looks like that one has a speaker so maybe it does produce a tone. Just run it into the guitar amp.

Imagecraft compiler user

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Probably my description was not clear enough...
I describe it simply:

I want to measure by the Tuner frequency from the AVR microcontroller. Microcontroller is programmed so on its oputput is generated square signal (audio frequency) so I thought I could use tuner to measure output frequency.

I don`t know how to describe it better. Instead of using guitar I want to measure period of the square wave from the microcontroller. By this post I wanted to assure I can give 5V to tuner from microcontroller and nothing will happen with the Tuner. I mean I don`t burn it.

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Put a 10k resistor in series with your Mega output and feed this to a tuner input - it will be 100% safe and shall work.

Warning: Grumpy Old Chuff. Reading this post may severely damage your mental health.