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Forum Connecting 3.5mm jack to logic board in place of surface mount mic.
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  • raspberry pi
  • amazon echo dot
  • surface mount microphones
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Connecting 3.5mm jack to logic board in place of surface mount mic.

adminindisguise
adminindisguise over 9 years ago

I am trying to find out if this is even possible. Been watching Ben Heck talk about how great this community is for over a year now and thought it would be a great place to find an answer.

 

I am working on a raspberry pi project where I will make an Echo Dot controllable via voice chat in a Discord server.

 

The jist of it is that I want to do is connect the audio out from the raspberry pi to the microphone connection on the Echo Dot in the place of a surface mount mic.

From there I will connect the audio out from the dot back into the pi, but that will be simple seeing as how there is already an audio out on the dot.

 

My question is: Would it even be possible to run that 3.5mm audio signal into a surface mount input.

It makes sense in my head that if I make the output mono I should be able to use either the L or R connection coming from the 3.5mm into the input mount for the mic. But before I go and destroy a $50 Dot I just wanted to know if it is theoretically possible or if I'm wasting my time.

 

Thanks much for any information you can give!

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  • jw0752
    jw0752 over 9 years ago +1 suggested
    Hi Blake, The one problem that I can see, and there may be others , is that the signal levels and impedance will not match and your audio may be garbled by over driving the input where the mic was. Jo…
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  • jw0752
    0 jw0752 over 9 years ago

    Hi Blake,

    The one problem that I can see, and there may be others , is that the signal levels and impedance will not match and your audio may be garbled by over driving the input where the mic was.

    John

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  • adminindisguise
    0 adminindisguise over 9 years ago in reply to jw0752

    I'm wondering if there may be a way to use the Pi's GPIO pins for a lower power audio out, or possibly adding some resistance between the units. I am fairly inexperienced with altering signals and don't know how that would play out. Thanks for your insight on the project. I'll keep updating this thread if I go through with it and let everyone know how it goes.

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  • jw0752
    0 jw0752 over 9 years ago in reply to adminindisguise

    Hi Blake,

     

    If you can find out the output level and know the input level yes the signal can be attenuated with resistors and capacitors.

     

    John

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  • jw0752
    0 jw0752 over 9 years ago in reply to adminindisguise

    Hi Blake,

     

    If you can find out the output level and know the input level yes the signal can be attenuated with resistors and capacitors.

     

    John

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