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Author Topic: Last mounting question, hopefully  (Read 5811 times)

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Offline weatherc

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Re: Last mounting question, hopefully
« Reply #15 on: February 17, 2017, 07:19:39 PM »
Interesting, what distance?

Some 5-6 m.

Quote
Ice build up, in California?

No, but up here with heated gauge yes  :D
First winters with they untouched had i to try to get away that ice to not break the thing but also because it clogged the water-holes in the bottom of the rainpot at the end. So it is a really crap design by default.

Offline N7XSQ

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Re: Last mounting question, hopefully
« Reply #16 on: February 17, 2017, 07:27:03 PM »
I seem to recall that at one time the humidity sensor worked like a variable capacitor, and the capacitance measuring circuit was on the SIM board. Adding extra cable was not recommended because that could alter the capacitance. Is it not like that any more?

N7XSQ

Bashy

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Re: Last mounting question, hopefully
« Reply #17 on: February 17, 2017, 07:30:08 PM »
I will be going 10m's, if not then i will have to mount it on the mast and that i didnt want to
do due to the heat off the summer house roof :/

As it stands, i cannot find any 6 core connectors locally anyway :/

Offline niko

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Re: Last mounting question, hopefully
« Reply #18 on: February 17, 2017, 07:31:39 PM »
I seem to recall that at one time the humidity sensor worked like a variable capacitor, and the capacitance measuring circuit was on the SIM board. Adding extra cable was not recommended because that could alter the capacitance. Is it not like that any more?

N7XSQ

No, it's a totally digital sensor now, SHT11 until recently, now SHT31 I think. It uses 2 wire serial comm similar to I2C which is usually only used for on board or board to board interface, but apparently it works over longer distances.
« Last Edit: February 17, 2017, 09:55:31 PM by niko »

Offline niko

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Re: Last mounting question, hopefully
« Reply #19 on: February 17, 2017, 07:35:58 PM »

Bashy

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Re: Last mounting question, hopefully
« Reply #20 on: February 17, 2017, 07:37:48 PM »
IS that gonna be too long?

Offline niko

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Re: Last mounting question, hopefully
« Reply #21 on: February 17, 2017, 07:45:56 PM »
Don't know. Based on the chip's datasheet I'm surprised 5-6 m works for weatherc so all bets are off :dontknow:

Bashy

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Re: Last mounting question, hopefully
« Reply #22 on: February 17, 2017, 07:47:40 PM »
oh well, only one way to find out :/ going the other way would cost a fortune in cable x3 :(

Offline weatherc

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Re: Last mounting question, hopefully
« Reply #23 on: February 17, 2017, 08:14:33 PM »
Ald old thread about the subject: http://www.weather-watch.com/smf/index.php?topic=48099.0
EDIT: Anoher one whre Sensirion have answered 3-10 m should be fine: http://www.wxforum.net/index.php?topic=14091.0
« Last Edit: February 17, 2017, 08:16:46 PM by weatherc »

Offline niko

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Re: Last mounting question, hopefully
« Reply #24 on: February 17, 2017, 08:28:59 PM »
Good find  :D  Bottom line, never read the datasheet before you try something  :lol:

Quote
Carrying the SCK and DATA signal parallel and in close proximity (e.g. in wires) for more than 10cm may result in cross talk and loss of communication.

I guess it's pretty safe. With the serial comm protocol and checksum system I doubt you can actually get wrong values in the data, if there's a problem I think it will be garbage data that the ISS will reject.

Offline weatherc

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Re: Last mounting question, hopefully
« Reply #25 on: February 17, 2017, 09:11:02 PM »
Bottom line, never read the datasheet before you try something  :lol:

Yep, trial/error was my route there too. As i needed at least 2-3 m back then did i the 5-6m wire as a test as longer wire = easier to get located nicely. I had in mind that it may not work, but it have worked just fine. As its a "normal, but 6-core phonewire" had it been easy to cut and add a new RJ-plug at the end if it not worked.  :D

Offline prodata

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Re: Last mounting question, hopefully
« Reply #26 on: February 17, 2017, 09:39:49 PM »
Google for Davis 7346.221

(@weatherc - lowland England != Finland)
John Dann
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Offline niko

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Re: Last mounting question, hopefully
« Reply #27 on: February 17, 2017, 09:53:06 PM »
(@weatherc - lowland England != Finland)

Fenland?

Offline prodata

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Re: Last mounting question, hopefully
« Reply #28 on: February 17, 2017, 09:54:35 PM »
Fenland?

 :D (though Breckland might be more appropriate for this thread - sure Bashy will explain to the uninitiated)
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Offline niko

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Re: Last mounting question, hopefully
« Reply #29 on: February 17, 2017, 09:57:13 PM »
I didn't know that one...

Brexitland?