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Author Topic: Aspirated fan Upgrade  (Read 1523 times)

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Offline MichaelPT

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Aspirated fan Upgrade
« on: May 04, 2017, 03:37:01 PM »
Hi everybody

Some time ago I made a aspirated solar radiation shield

I've updated the fan module  I've incorporated a small reed switch  connected  to a LED
a small magnet  is attached to 1 of the fan blades  when the fan rotates it will cause the  LED to flash  indicating  the fan is working correctly and rotating

If the LED  stops flashing  then this indicates maintenance is required and the fan is not rotating

I'm using a small battery cell Don't know how long The battery will last  as the LED is switching on and off when the battery dies it is to replace
and this would indicate a good time to give it a good clean and overall
another solution would to use a small rechargeable battery with a small solar cell to keep the battery  charged

http://www.weather-above.com/solarrdscreen2.html

Please see image

« Last Edit: May 04, 2017, 03:40:47 PM by MichaelPT »

Offline aardvark

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Re: Aspirated fan Upgrade
« Reply #1 on: May 04, 2017, 08:40:52 PM »
you could wire in a small voltmeter and you would have an idea of the voltage as it drops. 


https://www.google.com/search?q=voltmeter+gauge&ie=utf-8&oe=utf-8
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Offline JohnnyBoy

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Re: Aspirated fan Upgrade
« Reply #2 on: May 05, 2017, 07:19:28 AM »
Hello,

I have an i2c current monitoring board inline (hooked up to a raspberry pi), which then tells me how much current is being used by the fan.. that is then being monitored by nagios, which then tells me if the current drops, thus the fan has stopped/failed, gone walk about.

John
John


Offline aardvark

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Re: Aspirated fan Upgrade
« Reply #3 on: May 05, 2017, 01:55:47 PM »
I really like your engineering of this project.   It is worth it. 
Davis VP2 Plus; 24h  FARS; Extra Temp Humid sensor (2); Extra Temp Station (2); Soil Moisture/Temp Station;Weatherlink IP;USB; MAC Sierra; Bloomsky Sky2 ; http://www.desmoinesweather.org

Offline niko

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Re: Aspirated fan Upgrade
« Reply #4 on: May 05, 2017, 05:25:35 PM »
What's the source of the fan?

Most computer fans now are either 3 wire, or 4 wire. A 3 wire fan has a tachometer signal output which can be used for failure detection. A 4 wire fan has the tach output and also a control input that can be used for speed control. The speed control is a pulse (PWM) signal.

Offline niko

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Re: Aspirated fan Upgrade
« Reply #5 on: May 05, 2017, 05:26:44 PM »
I really like your engineering of this project.   It is worth it.

Yeah, if I had power out to my station I would DIY an aspirated shield too.

Offline MichaelPT

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Re: Aspirated fan Upgrade
« Reply #6 on: May 05, 2017, 08:00:49 PM »
Yeah, if I had power out to my station I would DIY an aspirated shield too.

Hi

Thank you for your suggestions I found a  small voltmeters  module

The fan only has two wires ,This is connected into a  fan controller module with a maximum power set to 7.5 DC ,, (nnormal voltage level should be 12 V, but it works fine  at 7.5 DC)

Temperature reading 16.2c =  3.92 v  Fan voltage
                                 15.0c =  3.85v
                                 14.0c =  3.74v
                                 11.0 c=  359v
                                 10.oc =  3.52v

Ice Block on the fan speed temperature  Sensor Lowest speed  min 3.20v     max hot water 7v

mick

Offline BWX

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Re: Aspirated fan Upgrade
« Reply #7 on: May 06, 2017, 02:15:24 PM »


Quote from: niko on 05-05-2017, 18:26:44<blockquote>Yeah, if I had power out to my station I would DIY an aspirated shield too.
</blockquote><blockquote>
</blockquote><blockquote>Solar would work, does work :)</blockquote>


 

cumulus