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Old 18th April 2015, 03:16 PM   #1
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Default Voltage on audio line.

Hello there audio pro and mavin people!

I have this primitive hobby project, where an Arduino micro-controller board communicates with a smartphone, via the phone audio jack. The phone plays these Audio files and the Arduino samples the voltage on the audio line, in order to discern between high voltage, low voltage and no voltage. It's a simple project and it already works OK without any amplification and that is how i want it to stay for that project (without amplification).

But i have a suspicion that it could work even better, if i had a bit more knowledge about the types of sounds that produce various levels of voltage on an audio line. What i am using now is a sound of a siren, that i recorded with such a gain, that it is full of distortion. i think distortion is good for my case since it seems to be decoded by the Arduino as a high voltage signal most of the time, but when i installed a primitive sound editor software on my computer and set the graphic view of the sound file in a certain way, i saw that actually only small portions of that sound file, actually raises the sound magnitude to the maximum possible. My conclusion was that it must be surly possible to create a sound file, that produces even a higher voltage on the audio line.

So my question is, what kind of sound sample would produce the highest voltage on an audio line?

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Old 19th April 2015, 12:28 AM   #2
kevinkr is offline kevinkr  United States
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The tubes / Valves forum is really not the right place for this thread. Moving to a more appropriate forum.

Edit: Based on the question PC Based seems like a reasonable choice.
"Extraordinary claims require extraordinary evidence." - Carl Sagan
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Old 19th April 2015, 05:49 AM   #3
wwenze is offline wwenze  Singapore
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Check Arduino datasheet for what it wants for high/low/no(?) voltage levels.

Then check your phone what is the full-scale output level.

The rest can use audacity to make whatever voltage you want.
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