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blueroomelectronics said:How are you going to run the data from the sensors? I2C is not terribly fond of long cable lengths.
HarveyH42 said:......Humidity will be a little lower indoors, but not a big enough difference to have any effect here. ...
mrmonteith said:I have to disagree. Might want to actually do a test of that assumption. I have a guage set of meters for all the above. I can take it from the house to outside and the humidity can vary a LOT.
Think about it. Unless you're fanning doors or have windows open the inside is isolated from the outside. Plus if you're running either A/C or heat it's going to change even more depending on the type of heat.
It will try to even out but it usually takes quite a long time based on how much air flows in and out of the house. If you're dead set on it being inside you could set it on a window sill with a window cracked open to get as close as possible.
Michael
3v0 said:Harvey would not want to use this but others may find the hair hygrometer of interest.
Hair changes length depending on humidity. On more humid days, hair will lengthen.
The diagram below shows a simple hair hygrometer. It takes about a foot of hair to create a sensor but it could be wound around a pulley or two to decrease the length. The pointer could be used to block light between a LED and a photo transistor for sensing.
Image .
EDIT: Horse hair can also be used and may be more durable.
Date: Fri 02/29/08 05:13 AM
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Dear Harvey
Your order is complete, except for HP01D and IDCC10, we are currently following up on these 2 parts with our warehouse. We will fulfill them to your order and keep you updated as soon as they become available.
Should you have any further enquiry, please feel free to contact us.
Best Regards
Amp
Futurlec
HarveyH42 said:Just got this from Futurlec:
The HP01D is the barometric pressure sensor. So looks like I'll need to find another source. Mr. Amp's english isn't too clear on whether or not I'll be getting those two parts, figure it might be a while.