Sandaysoft

Cumulus weather station software
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 Post subject: Re: Home built FARS
PostPosted: Sat Feb 06, 2010 10:41 pm 
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Joined: Mon Jan 04, 2010 10:01 pm
Posts: 125
Location: Stevenage, UK
Weather Station: WH1081
Operating System: Vista 32bit bus edit
Gina, that's interesting, this would suggest that the chip on the controller inside the fan uses PWM to control and monitor the speed. Not sure why the frequency increases when the lower voltage is applied?

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http://www.micro-heli.co.uk/

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 Post subject: Re: Home built FARS
PostPosted: Mon Feb 08, 2010 3:31 am 
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Joined: Wed Sep 16, 2009 10:54 pm
Posts: 5
Weather Station: Davis lacrosse
Here is my new fars. It has a cd player motor running off
a garden solar panel. Works great.


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 Post subject: Re: Home built FARS
PostPosted: Mon Feb 08, 2010 7:38 am 
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Joined: Sat Dec 26, 2009 7:59 am
Posts: 106
Location: Sheffield UK
Weather Station: WH1080
Operating System: Vista
Just a note to the wise, always make sure any fan you use is moving the air away from the temperature sensor. If you use the fan to blow onto the sensor the heat from the fan motor could influence (even if only slightly) your readings.

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 Post subject: Re: Home built FARS
PostPosted: Fri Feb 12, 2010 11:10 am 
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Joined: Sat Feb 21, 2009 12:41 pm
Posts: 700
Location: Devon UK
Weather Station: FO WH1081PC (Maplin)
Operating System: Linux Mint 9 & Win XP SP3
Yes, my fan draws air upwards away from the sensor.

This morning we are getting alternate sunny spells and cloud and I can see the result on the recorded temperature. With the fan running at a low speed I'm getting just under one degree Celcius rise in the sunny spells. I've just turned the fan speed up a bit and will see if it makes any difference. Previously I was getting 2 or 3 C rise due to sunshine.

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Gina
Blackdown Hills Weather powered by G-Weather (Linux software in development)
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 Post subject: Re: Home built FARS
PostPosted: Thu Mar 04, 2010 1:11 pm 
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Joined: Sat Feb 21, 2009 12:41 pm
Posts: 700
Location: Devon UK
Weather Station: FO WH1081PC (Maplin)
Operating System: Linux Mint 9 & Win XP SP3
Now appear to be getting just below 1 degree C rise due to solar radiation so the difference due to increased airflow is marginal. But the difference from no aspiration is significant. There is also a significant improvement in the humidity readings. Previously the readings were almost always 90% and above but now they look much more realistic. Both day and night RH readings have improved by the constant aspiration.

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Gina
Blackdown Hills Weather powered by G-Weather (Linux software in development)
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