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Topic: DC Fan Help (Read 1 time) previous topic - next topic

PeterH

Given that you are outputting a constant value, you might just as well put that value directly in the call to analogWrite() rather than map it from another constant.

When you say it's making a noise, do you mean the motor is stuttering on/off of that the motor moves smoothly but makes an audible noise? Can you describe the noise - is it steady and consistent?
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MadMatt

yeah its going on and off like you said and it is making a hearable noise and is consistent any soloutions?

PeterH

Clarify - is the motor stuttering on and off, or is it moving steadily?

What is the noise like?

You can see and hear what's going on - we can only guess from your description, which hasn't told us much so far.
I only provide help via the forum - please do not contact me for private consultancy.

HazardsMind

You might need a capacitor to smooth out the output signal of the transistor, going to the motor. Just put a capacitor from the between the motor contacts, make sure you wire it correctly (polarized). It should get rid of any noise, unless the noise is not from the PWM but from a defect in the motor itself.

470uf should be more than enough.
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dhenry

Quote
making a hearable noise


The pwm frequency is too high.

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