Using 2 fans at once

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space cops
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Joined: Fri Sep 30, 2016 6:36 pm

Fri Sep 30, 2016 6:47 pm

now this may be an odd question and already asked, but looking at these
https://www.dfrobot.com/index.php?route ... ct_id=1520
is it possible to use two of these at once?, I notice that only 2 of the 4 ports are being used for power

Image

theoretically, would that work? would the lattepanda power it fine without issue?

also, this may have also been asked, but is it possible to turn on and off the fans from that port?

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space cops
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Sat Oct 01, 2016 5:53 pm

Could you perhaps turn on and off the fan by using the arduino paired with a MOSFET transistor, controlling the power from the fan pins?

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LattePanda
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Mon Oct 10, 2016 10:53 am

the 5v and gnd pins on the gpio all share the same rail as the cn2 headers so you can use any of the arduino pins
if you only want to use one terminal, you could also solder two fans' wires together in parallel
Enjoy Tinkering with LattePanda ! :lol:

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space cops
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Thu Oct 13, 2016 2:33 am

Thank you for your response

However, your documents state that the arduino pins only support up to a 40mA draw. these fans are .14A, which translates into a 140mA draw. Wouldn't that be bad to connect it directly to arduino?

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LattePanda
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Fri Oct 14, 2016 3:13 am

space cops wrote:Could you perhaps turn on and off the fan by using the arduino paired with a MOSFET transistor, controlling the power from the fan pins?
yes this is should be possible, something we would like to try
space cops wrote:Thank you for your response

However, your documents state that the arduino pins only support up to a 40mA draw. these fans are .14A, which translates into a 140mA draw. Wouldn't that be bad to connect it directly to arduino?
fair point. currently i have three fans hooked up, one to the CN2 interface, and 2 to the 3 pin gpio interfaces. Doesnt seem to be a problem...
may i ask your requirements for two fans?
if your purpose is cooling the CPU then one should be sufficient.

tip: looking at your images I would recommend removing the shielding from the underside of the board so that the fan directly contacts the processor. the shielding is held on with 8 clips, so a sharp object placed underneath the shielding with gentle rotating pressure nearby each clip should prize it off. underneath the shielding you will find a preattached cooling pad that you can attach your fan to
Enjoy Tinkering with LattePanda ! :lol:

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Boring
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Fri Oct 14, 2016 9:29 am

Why do you use GPIO 2&3? Is it also possible to use pin 22 and 24 as source for 5V?

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LattePanda
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Fri Oct 14, 2016 10:47 am

Boring wrote:Why do you use GPIO 2&3? Is it also possible to use pin 22 and 24 as source for 5V?
apologies for not being clear -
by "2" i mean two fans
by "3 pin interface" i mean the GPIO that integrate power, ground and signal, directly below the lattepanda logo shielding
Enjoy Tinkering with LattePanda ! :lol:

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space cops
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Fri Oct 14, 2016 6:11 pm

I decided to only use one fan for the time being, and since I cannot connect the 140ma fan to the arduino digital pins (which are limited to 40ma), I decided to use a moset to turn on and off the fan when needed

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LattePanda
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Wed Nov 02, 2016 7:15 am

sounds good. would you care to share your solution for the community?
Enjoy Tinkering with LattePanda ! :lol:

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