MAX4466 microphone
Moderators: adafruit_support_bill, adafruit
Please be positive and constructive with your questions and comments.
- mfenwick
- Posts: 8
- Joined: Mon Jul 18, 2016 10:01 am
MAX4466 microphone
Hello, I recently purchased both the MAX 4466 and the MAX 9814. I have been able to get the 9814 working, but I think that the 4466 may be defective. How do I handle this?
- adafruit_support_bill
- Posts: 88090
- Joined: Sat Feb 07, 2009 10:11 am
Re: MAX4466 microphone
Please post photos showing your soldering and connections to the board and describe exactly the symptoms you are seeing.
- mfenwick
- Posts: 8
- Joined: Mon Jul 18, 2016 10:01 am
Re: MAX4466 microphone
https://learn.adafruit.com/adafruit-mic ... und-levels. I have the 9814 and it is working fine. Please help. I am getting extremely low values, the same type of values that I get when I unplug the microphone altogether.
I have tried using this microphone with several test sketches, some that I had found on your site. This includes, but is not limited to - adafruit_support_bill
- Posts: 88090
- Joined: Sat Feb 07, 2009 10:11 am
Re: MAX4466 microphone
The soldering and connections look fine. Have you tried adjusting the gain?
Be gentle with the gain pot, it is easy to damage by turning past the stop. If I recall correctly, the gain increases by turning counter-clockwise.
Be gentle with the gain pot, it is easy to damage by turning past the stop. If I recall correctly, the gain increases by turning counter-clockwise.
- mfenwick
- Posts: 8
- Joined: Mon Jul 18, 2016 10:01 am
Re: MAX4466 microphone
I have adjusted the gain, it seems to only move about 2/3 of a full revolution. Is that normal? Like you said, I didn't want to force it, because I know how easily potentiometers can be damaged. It just seems to be unresponsive to sound.
- adafruit_support_bill
- Posts: 88090
- Joined: Sat Feb 07, 2009 10:11 am
Re: MAX4466 microphone
2/3 of a revolution is about normal for the gain pot.
We can try replacing the board. Please contact [email protected] with a link to this thread.
We can try replacing the board. Please contact [email protected] with a link to this thread.
- mfenwick
- Posts: 8
- Joined: Mon Jul 18, 2016 10:01 am
Re: MAX4466 microphone
Thank you for your help. I just sent them an email with the link.
- VanB
- Posts: 2
- Joined: Wed Aug 10, 2016 5:52 am
Re: MAX4466 microphone
Hello
I connect the MAX4466 to Arduino uno and read out the voltage. But the voltage fluctuate very much.
How can i remove this Problem ?
kind regards Vanessa
I connect the MAX4466 to Arduino uno and read out the voltage. But the voltage fluctuate very much.
How can i remove this Problem ?
kind regards Vanessa
- adafruit_support_bill
- Posts: 88090
- Joined: Sat Feb 07, 2009 10:11 am
Re: MAX4466 microphone
That is not a problem. That is how microphones work. They measure sound waves which are fluctuations in air pressure. A change in pressure translates into a change in voltage.I connect the MAX4466 to Arduino uno and read out the voltage. But the voltage fluctuate very much.
How can i remove this Problem ?
If you want to measure the average sound level, you need to take the peak-to-peak measurement and average it over time. That is what this code does: https://learn.adafruit.com/adafruit-mic ... und-levels
- VanB
- Posts: 2
- Joined: Wed Aug 10, 2016 5:52 am
Re: MAX4466 microphone
I use this code to measure the average sound level.
I use a noise generator and send a fixed frequency with 90 db.
And i think the voltage has to be stable at this high values.
I use a noise generator and send a fixed frequency with 90 db.
And i think the voltage has to be stable at this high values.
- adafruit_support_bill
- Posts: 88090
- Joined: Sat Feb 07, 2009 10:11 am
Re: MAX4466 microphone
The only time the voltage will be stable is when there is no sound at all. Sound is fluctuations in pressure and that is what the microphone is measuring.
If you have a constant sound level, the average peak-to-peak measurement over time should be relatively constant. Not the raw voltage.
Post a photo of how you have everything set up - and a sample of the output from the serial monitor.
If you have a constant sound level, the average peak-to-peak measurement over time should be relatively constant. Not the raw voltage.
Post a photo of how you have everything set up - and a sample of the output from the serial monitor.
Please be positive and constructive with your questions and comments.