Weather Station Hardware > Davis Instruments Weather Stations

SHT21 as alternative to SHT11

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dataworx:
I came across this sensor board and was considering whether it could be used as an alternative to the SHT11 in the older stations. I appreciate that there are a bunch of technicalities, so if anyone here has some info to share, I'd be most interested:

http://www.ebay.com/itm/SHT21-Digital-Humidity-And-Temperature-Sensor-Module-Replace-SHT11-SHT15-AM-/253076359731?epid=939419517&hash=item3aec86ca33:g:DMsAAOSwPK5ZgwVS

azchrisf:
This was something I was thinking about earlier, if we can get a list together of sensors that can improve the Davis's accuracy, yet still be pin for pin compatible and work with the software, if possible, that we can replace.

dataworx:
I've sourced one of the sensors linked to above - I'm quite happy to test it but I'm hoping that one of the more knowledgeable members will be along to help me with a pinout so I don't immediately wreck it by hooking it up incorrectly. I have a couple of stations here so I can easily do a side-by-side comparison to test accuracy.

johnd:
I guess you need to explain why you might want to use SHT21 in place of the SHT31 that's readily available from Davis as a drop-in replacement for SHT11? OK, you need to apply the prescribed temperature offset to the console temp, but that's easily done. Maybe cost is an alternative factor, but the SHT31 board cost isn't exorbitant.

dataworx:
I think there are a few factors, one of them being price ($6 versus $40-$50, which is a considerable difference). The primary reason though is that I'm an inveterate tinkerer. With Scottish blood. So if I can find a cheaper, effective solution I'm all for it, especially for stations that are a decade old and need to be kept in service.

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