Microphone and Client interfere each other?

Forum 2005-2010 (read only) Hardware Interfacing
1

Hey im using a microphone to get analog input.
and im connecting to Client as well using Ethernet.h

I'm printing my analogRead(0); into my serial.
and this is what i get:

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Connecting to Client...
Client Connection Failed!
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Connecting to Client...
Client Connected.
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Connecting to Client...
Client Connection Failed!
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Connecting to Client...
Client Connected.
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and so on...
I'm not making any sound when it trys to connect to client, and when its trying to connect (success or failure) it fucks it up till next try...

WTF is going on? lol
any ideas?

2

What is going on is that the increased electrical activity is causing electro magnetic noise that is being picked up by your microphone interface.
What microphone interface have you got and how is it wired up. It looks like it has an input impedance to the A/D that is too high.

3

What is going on is that the increased electrical activity is causing electro magnetic noise that is being picked up by your microphone interface.
What microphone interface have you got and how is it wired up. It looks like it has an input impedance to the A/D that is too high.

Hey thanks for the replay.

I'm using Sound Sensor V2.0 from www.flamingoeda.com

It is connected:
Ground to Ground on the arduino,
5V to 5V on the arduino,
Analog to Analog0 on the arduino.

And the arduino it self connected to an external 5V power supply.

4

That web page is all:-

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Do you know of a schematic of what you have.

I would have thought the first thing you need to do is to add some isolation to the Sound sensor's power supply, like adding L&C decoupling.
http://www.thebox.myzen.co.uk/Tutorial/De-coupling.html

5

Thanks again,
Sorry no schametic..

Should i add this on the 5V line or the analog line?
And if i connect the sensor to an external power supply?

6

The sensor is connected to a source of 5V. If this is the same as your Ethernet interface then you need to isolate it. So an inductor (or resistor) from the 5V, other end to the 5V power of your sound interface and then capacitors across the 5V and ground of the sound interface.

You can try a separate supply but good decoupling should do.

Other things to try is a 0.1uF capacitor between the analogue input you use to ground.