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 1 year 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 1 year 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 1 year 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…

JWx over 1 year ago in reply to naimlion

I don't know microbit and don't know language from the photo - could you share it using makecode.microbit.org as previous (it will translate)? The problem is that this webpage translates to my language that will be in turn unusable to you...

can you put block setVolume in loop before playing sound? something like this:

- read pot

- setVolume(pot)

- playSound()

and first verify that it correcly reads pot values when potentiometer position changes?

what is setSound called in your interface?
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JWx over 1 year 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 1 year ago in reply to JWx

https://makecode.microbit.org/_7WM2Hdhbfat8
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JWx over 1 year 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 1 year 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 1 year 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 1 year 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 1 year 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 1 year ago in reply to naimlion

glad to help!
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JWx over 1 year 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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