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Author Topic: computer rpm signal wire?  (Read 1351 times)

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Offline BANETopic starter

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computer rpm signal wire?
« on: September 30, 2010, 05:48:24 PM »
Hello all,
I'm currently working on my hacked power chair's motor controller and happened to include 2 80mm fans (probably overkill, but cool looking) to it.  http://www.xoxide.com/thunderblade4.html
My question how and what can i control with the rpm wire?  I'm assuming i can control the fan's speed. it is serial or pwm?  
thnx,
bane
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Offline Soeren

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Re: computer rpm signal wire?
« Reply #1 on: September 30, 2010, 07:37:35 PM »
Hi,

Quote from: BANE on September 30, 2010, 05:48:24 PM
My question how and what can i control with the rpm wire?
Nada.
It's a sense wire that is used to measure the speed of the fan (the page actually tells you so).
You can control it by either a varying voltage or PWM on the positive wire and then get feedback from the sense wire, to make a closed loop.

And yes... Humongous overkill  ;D
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Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Please remember...
Engineering is based on numbers - not adjectives

Offline madsci1016

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Re: computer rpm signal wire?
« Reply #2 on: October 01, 2010, 11:53:52 AM »
Quote from: BANE on September 30, 2010, 05:48:24 PM
what can i control with the rpm wire?  

A fan fail alarm. Something that will just buzz or even shut down the controller if a fan fails.
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Offline BANETopic starter

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Re: computer rpm signal wire?
« Reply #3 on: October 01, 2010, 04:05:07 PM »
thnx, i'm just going to control both fans with a relay so i'll just cut that wire off.   Just out of curiosity, the signal form of the signal wire?  is it Analog? I/O? Serial?

bane
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Offline BANETopic starter

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Re: computer rpm signal wire?
« Reply #4 on: October 01, 2010, 05:45:25 PM »
just in case anyone wants to see the power chair's motor controller unit :)    Has a 70amp 24v relay between the sabertooth2x25/circuitry and batteries controlled by the landing gear toggle on my heli RC controller.  I decided to install this e-stop feature after loosing control of this robot and having it crush a hole in the wall.
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