Hi,
I think it is possible to control the volume of a speaker by using a I2C IO expander and some transistors and resistors. Maybe a amplifier? Not sure what speaker I should use.
I have no idea what parts to use.
I will add a schematic later.
Is that a good idea or is there a easier way.
Is it also possible to do this with software?
Preferably works with 3.3v logic.
What I want it to do:
Control sound volume with software(and hardware?).
Eg: not using a pot.
The arduino must be able to know what volume the sound is at.
Sorry if not clear enough.
Thanks.
Can you expand on what type of amplifier you use for the speaker?
Do you have two channels (i.e. stereo)?
I have no idea because i don’t have an amplifier yet.
Which one would you recommend?
Too broad a question.
Could you tell me which parts need clarification?
I will elaborate tomorrow.
Thank you.
Sort of diagram coming tomorrow.
So all we know is you want to control the volume of a speaker using an amplifier you don't know yet.
No idea of your goal, application etc.
Yes. But I was thinking of using a separate circuit to do that.
Sorry, Will clarify latter.
Great! Thank you! I will look into those.
Seems like a perfect solution.
Can I input a signal in to the digital pots voltage input?
Now about the amplifier and speaker.
Thank you.
I was only considering it as a volume adjust (potentiometer). I do not know if it will process signal fidelity by increasing the highs and decreasing the lows.
Hmm not sure if I understand that. Could you clarify? I thought it would just make the sound quieter depending on what number it is set on. Will the chip work with 3.3v logic? Thanks.
That was my belief. Just a potentiometer.
Other digital potentiometers might work for you. The link shows +3V and +5v for Vdd (positive power), and -2.7v and 0v for Vss (negative power). It seems to indicate 3v3.
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You need a "power amplifier" to drive a speaker. Or, regular "computer speakers" have an amplifier built-in. (These are sometimes called "active" or "powered" speakers.)
You can't directly adjust the volume between the amplifier and speaker... You normally adjust the Line Level audio going into the amplifier.
There are small amplifiers (around 1 Watt or less) and big amplifiers used for rock concerts. In a typical home stereo the amplifier is built-into the receiver which also acts as a "control center".
You can buy a complete amplifer, an Amplifier Board, or there are amplifier chips if you want to build your own.
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So just plain signal? no PWM?
Will look these up.
Does it have a “fixed” resistance?
Thanks.
Will get an amplifier.
What should I do about the stereo?
I have a 8Ω 0.5 watt speaker.
Thinking of getting different or more speakers.
Could amplifiers like that be used for earphones and headphones too?
Will look for some tutorials about amplifiers and using them with speakers.
Thank you.
Ok. I took a look at some digital pots but I have no idea which one to use.
Does anyone have a recommendation and example circuit?
Thank you.
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