circuit connexion of potentiometer and external speaker

hi please i want to change the sound volume using potentiometer and a speaker with arduino.can you help me to do the connection circuit .thx in advance

kind regards

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shabaz over 2 years ago in reply to naimlion +3

Hi, There's just two or three wires on the potentiometer. I strongly suggest you just wire it up (in any way you think fit, you can google this), and see what happens. You'll learn more from that experience…
JWx over 2 years ago in reply to phoenixcomm +2

In the end it turned out that it was software task - potentiometer was supposed to drive software based volume control, which the author finally achieved...
shabaz over 2 years ago in reply to naimlion +1

Hi, You're not bothering me, this is genuinely the best advice I can think of. It's the best way to learn, just to try it, because in this particular instance, you're very unlikely to damage anything…

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JWx over 2 years ago

What sort of speaker? Dynamic one can overload arduino pin if connected directly - it can have several ohm resistance (so series connected potentiometer can help limiting current, if never set to zero) - better add additional resistor in series so max. current draw from the pin will not exceed MCU limits...
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naimlion over 2 years ago in reply to JWx

hi again

i have this one

www.google.com/url
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JWx over 2 years ago in reply to JWx

there is possibility that microbit library doesn't allow for changing volume of sound played by playSound() - in this case analog version (pot between micorbit and speaker module) would do the trick...
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naimlion over 2 years ago in reply to JWx

https://makecode.microbit.org/_7WM2Hdhbfat8
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JWx over 2 years ago in reply to naimlion

ok - this is different code - it changes frequency of tone using potentiometer connected to P2 (so potentiometer reading works)

playTone has definition playTone(frequency, duration)

let pot = 0

basic.showIcon(IconNames.Heart)

music.setBuiltInSpeakerEnabled(false)

pins.setAudioPin(AnalogPin.P1)

basic.forever(function () {

pot = pins.analogReadPin(AnalogPin.P2)

music.playTone(pot, music.beat(BeatFraction.Whole))

})

can you check in main loop

- reading value of P2 to pot variable

- calling setVolume(pot) <- the same setVolume which you have had in previous version at the top with 127 value

- then playSound?

and of course it wouldn't allow for changing volume during playback - it is read only once per play...

I will advise for analog volume control
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naimlion over 2 years ago in reply to JWx

thx a lot i will try but i want to ask you why when i changed frequency the volume changed also

is it the same thing?

regards
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JWx over 2 years ago in reply to naimlion

I think that it is rather strange when volume changes along with frequency - is it big change? Maybe speaker has narrow bandwidth and plays quieter sounds near the edges... It seems that this module has also capacitor connected parallel to potentiometer - it could make tones of higher frequency quieter (lower impedance of capacitor on high frequences - but I haven't checked its capacitance - it can be too small to make difference for audio)
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naimlion over 2 years ago in reply to JWx

thx a lot best friend .i don't want how to thank you really.all works well

i share you my rectified program with makecode(this is the microbit language that i teach to our pupils in school)

makecode.microbit.org/_imoEThioYhoC
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naimlion over 2 years ago in reply to JWx

now after we solved this and all works well.i have a question:can we use microbit speaker at the place of external speaker and can we change volume by potentiometer?

yours truly
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JWx over 2 years ago in reply to naimlion

glad to help!
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JWx over 2 years ago in reply to naimlion

I think it will work the same - simply remove disabling internal speaker and setting external audio pin...

so - remove:

music.setBuiltInSpeakerEnabled(false)

pins.setAudioPin(AnalogPin.P1)

and check if it will suffice
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naimlion over 2 years ago in reply to JWx

how to be in touch with you really you are good person

email,fb,...
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naimlion over 2 years ago in reply to JWx

how to be in touch with you really you are good person

email,fb,...
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