Overheating Mecool M8s Pro L and Pro + (and others ?) - Options ???

[clarkss12]

Well done
Need Photos .....
: popcorn:

Crappy video posted......... What a job......... going to order resistor now.

[P.X]

Well done
Need Photos .....
: popcorn:

[clarkss12]

I have the fan installed in the "lid" (had to use caulk ). Sitting on my desk and and fan running as caulk dries. Yes, IT IS NOISY. Guess I will order a resistor.

[P.X]

DC fans only go one way. Need correct polarity to run ( from my experience).

31Ohm Fan

So 1W resistor best

~15 Ohm for 3.3V
10 Ohm for 3.75V
~8 Ohm for 4.0V

HTH

Check my rough calcs. ??

R = Vin.Rfan/Vout - Rfan

your Rfan = 31
Vin = 5
Vout = Desired Fan Voltage (0.00-5)


Check my transposition from
Vout = (Vin.Rfan) / (R + Rfan)

http://www.ohmslawcalculator.com/voltage-divider-calculator

[clarkss12]

I need to change the fan direction when I mount it, will switching the polarity change the fan direction without any issues?? I am making the assumption that I have a brushless motor.

[clarkss12]

Voltage for fan = 4.99 current = 0.16 amp.



Tester used.........

https://www.****.com/itm/KEWEISI-3V-...-/112220806777

Same device is cheaper on Aliexpress, don't recall where I purchased mine.

[clarkss12]

You can buy it on Amazon.

thanks, was wondering if there was any place local. Radio Shack has gone out of business.....

[P.X]

Where did you get your resistor??

UK in Maplin (closing down )
USA ? Radio Shack
https://www.radioshack.com/products/...-resistor-pk-5
plus other values

On The bay 1/4W Carbon Film Resistor
1Watt would better if lower resistance fan determined.

Local hobby store if still exists ???

Can you measure the current through your fan from USB ?

Rfan = V/I = 5/I

Series resistor value of half Rfan for 3.3V

Check fan runs at 3.3V by testing from UART pads. Some fans don't like too low voltage.

1/3 Rfan gives 75% Voltage

[mirbg]

You can buy it on Amazon.

[clarkss12]

Yay, have fun


I have to have a resistor for the fan noise, but if you are OK on that score, go for it.
Looking forward to photos minimum ...

Where did you get your resistor??

[P.X]

Tomorrow, I will grab my hole saw, Drimmel and drill, and make it permanent using your videos for instructions. I will solder to the backside of the board, but no resistor or transister. I never turn my boxes off, so I will have to keep an eye on dust collecting on the fan and internals.

Yay, have fun


I have to have a resistor for the fan noise, but if you are OK on that score, go for it.
Looking forward to photos minimum ...

[clarkss12]

Nice - Proof of concept.
Can't wait to see the next steps ...

Tomorrow, I will grab my hole saw, Drimmel and drill, and make it permanent using your videos for instructions. I will solder to the backside of the board, but no resistor or transister. I never turn my boxes off, so I will have to keep an eye on dust collecting on the fan and internals.

[P.X]

Nice - Proof of concept.
Can't wait to see the next steps ...

[clarkss12]

Looks good! You should drill a bigger hole for the fan, otherwise it will be (it is I suppose) very noisy. I did the same, started with few small holes and a fan above, but the noise forced me to make a bigger mod.

Of course me being an old man, with bad hearing, I can't hear it. But I am deciding on how to permanent mount it.... and solder the wires internally into the box. I just wanted to see how it would work.

[mirbg]

Looks good! You should drill a bigger hole for the fan, otherwise it will be (it is I suppose) very noisy. I did the same, started with few small holes and a fan above, but the noise forced me to make a bigger mod.