I would not recommend separating the temp/hum farther from the transmitter, not a good idea IMHO. Thatās why the replacement rain gauge base is a really convenient way to split the gauge, it has both shelter and transmitter mount.
Why not? Its just to extend the 6-core cable like the 4-core one. Nothing special there. Done that w/o problems.
One reason for splitting them apart are also so it not builds up ice between rainpot and temp/hum during the winter whats could break it.
Just FYI, its quite odd Davis not have taken in account that ice-build-thingy in the first placeā¦
My concern is the VP2 temp/hum uses more complex digital communication interface than the simple switch closure/variable resistance of the anemometer and rain gauge. But I guess itās not an issue after all
No, but up here with heated gauge yes
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.
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?
No, itās 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.
Good find Bottom line, never read the datasheet before you try something :lol:
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 itās pretty safe. With the serial comm protocol and checksum system I doubt you can actually get wrong values in the data, if thereās a problem I think it will be garbage data that the ISS will reject.
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 ānormal, but 6-core phonewireā had it been easy to cut and add a new RJ-plug at the end if it not worked.