What is used for sensing humidity?
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From: Rich Webb on 23 Mar 2010 10:25 On Tue, 23 Mar 2010 09:58:51 -0400, Hammy <spam(a)spam.com> wrote: >I've been goggling and all I've been finding is $50 to $100 plus, full >modules what is just the sensor used in for example dehumidifiers? > >I'm considering rigging a switch to control a bathroom exhaust fan in >my downstairs bathroom. The HIH-4000 series from Honeywell is pretty easy to use with a 5 V DC supply and a ratiometric output of relative humidity that's pretty linear. The GE HS-15P is about half the cost but it wants an AC drive and so is a bit more effort. -- Rich Webb Norfolk, VA
From: GregS on 23 Mar 2010 11:35 In article <_44qn.2$4C6.0(a)unlimited.newshosting.com>, "Greg Neill" <gneillRE(a)MOVEsympatico.ca> wrote: >Hammy wrote: >> I've been goggling and all I've been finding is $50 to $100 plus, full >> modules what is just the sensor used in for example dehumidifiers? >> >> I'm considering rigging a switch to control a bathroom exhaust fan in >> my downstairs bathroom. > >Humidistat. > >Check out the Honeywell H8908B1002 carried by Home Depot ($26.97): > >http://www.homedepot.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10051 >&langId=-1&catalogId=10053&productId=100476731&N=10000003+90401+502315 > >An applications sheet at: > >http://www.honeywell-thermostat.com/manuals/h8908b1002.pdf I bought another controler for the bathroom, but it did not have the reversed function to turn on when humidity goes up. Most are designed for humidifiers. I can't tell if the honneywell has the reversed contacts available, but does not mount in a standard wall box, and might not have enough sensing on the outside. greg
From: Jim Thompson on 23 Mar 2010 10:37 On Tue, 23 Mar 2010 15:17:14 GMT, zekfrivo(a)zekfrivolous.com (GregS) wrote: >In article <hoai8d$5hu$1(a)usenet01.srv.cis.pitt.edu>, zekfrivo(a)zekfrivolous.com (GregS) wrote: >>In article <u6ihq51fct66e4reaeh6nodj2kicte43qi(a)4ax.com>, Hammy <spam(a)spam.com> >> wrote: >>>I've been goggling and all I've been finding is $50 to $100 plus, full >>>modules what is just the sensor used in for example dehumidifiers? >>> >>>I'm considering rigging a switch to control a bathroom exhaust fan in >>>my downstairs bathroom. >> >>I installed a bathroom fan. The fan is in the attic for reduced noise. All you >> hear is >>sssshhhhh. I installed a hair humidstat in the old fan housing. I could not >> really set it >>properly. On humid days it would just stay on. I was also looking for another >> wall >>mounted unit that fits in a wall box. Currently I also have a timer controlling >>the fan in parallel with the humidstat. The best solution is a condensation >>sensor near the ceiling somewhere. I am also reconsidering how the fan exits >>through the roof. i would like to keep that air in the house, and run it >> downwstairs, >>especially since I have high radon levels with negative pressure. >> > >I may have found what I wanted.......... > >http://www.dewstop.com/dewstop_bathroom_fan_switches.html Just measure light reflection from a mirror ?:-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | The only thing bipartisan in this country is hypocrisy
From: GregS on 23 Mar 2010 11:45 In article <cgkhq5pfu243u8pg811ghq9s2dvskrigru(a)4ax.com>, Jim Thompson <To-Email-Use-The-Envelope-Icon(a)On-My-Web-Site.com> wrote: >On Tue, 23 Mar 2010 15:17:14 GMT, zekfrivo(a)zekfrivolous.com (GregS) >wrote: > >>In article <hoai8d$5hu$1(a)usenet01.srv.cis.pitt.edu>, zekfrivo(a)zekfrivolous.com > (GregS) wrote: >>>In article <u6ihq51fct66e4reaeh6nodj2kicte43qi(a)4ax.com>, Hammy > <spam(a)spam.com> >>> wrote: >>>>I've been goggling and all I've been finding is $50 to $100 plus, full >>>>modules what is just the sensor used in for example dehumidifiers? >>>> >>>>I'm considering rigging a switch to control a bathroom exhaust fan in >>>>my downstairs bathroom. >>> >>>I installed a bathroom fan. The fan is in the attic for reduced noise. All > you >>> hear is >>>sssshhhhh. I installed a hair humidstat in the old fan housing. I could not >>> really set it >>>properly. On humid days it would just stay on. I was also looking for another >>> wall >>>mounted unit that fits in a wall box. Currently I also have a timer > controlling >>>the fan in parallel with the humidstat. The best solution is a condensation >>>sensor near the ceiling somewhere. I am also reconsidering how the fan exits >>>through the roof. i would like to keep that air in the house, and run it >>> downwstairs, >>>especially since I have high radon levels with negative pressure. >>> >> >>I may have found what I wanted.......... >> >>http://www.dewstop.com/dewstop_bathroom_fan_switches.html > >Just measure light reflection from a mirror ?:-) > > ...Jim Thompson Thats sounds simple. Every camcorder has something inside. Well, only tape machines. greg
From: Jim Thompson on 23 Mar 2010 10:55
On Tue, 23 Mar 2010 15:45:09 GMT, zekfrivo(a)zekfrivolous.com (GregS) wrote: >In article <cgkhq5pfu243u8pg811ghq9s2dvskrigru(a)4ax.com>, Jim Thompson <To-Email-Use-The-Envelope-Icon(a)On-My-Web-Site.com> wrote: >>On Tue, 23 Mar 2010 15:17:14 GMT, zekfrivo(a)zekfrivolous.com (GregS) >>wrote: >> >>>In article <hoai8d$5hu$1(a)usenet01.srv.cis.pitt.edu>, zekfrivo(a)zekfrivolous.com >> (GregS) wrote: >>>>In article <u6ihq51fct66e4reaeh6nodj2kicte43qi(a)4ax.com>, Hammy >> <spam(a)spam.com> >>>> wrote: >>>>>I've been goggling and all I've been finding is $50 to $100 plus, full >>>>>modules what is just the sensor used in for example dehumidifiers? >>>>> >>>>>I'm considering rigging a switch to control a bathroom exhaust fan in >>>>>my downstairs bathroom. >>>> >>>>I installed a bathroom fan. The fan is in the attic for reduced noise. All >> you >>>> hear is >>>>sssshhhhh. I installed a hair humidstat in the old fan housing. I could not >>>> really set it >>>>properly. On humid days it would just stay on. I was also looking for another >>>> wall >>>>mounted unit that fits in a wall box. Currently I also have a timer >> controlling >>>>the fan in parallel with the humidstat. The best solution is a condensation >>>>sensor near the ceiling somewhere. I am also reconsidering how the fan exits >>>>through the roof. i would like to keep that air in the house, and run it >>>> downwstairs, >>>>especially since I have high radon levels with negative pressure. >>>> >>> >>>I may have found what I wanted.......... >>> >>>http://www.dewstop.com/dewstop_bathroom_fan_switches.html >> >>Just measure light reflection from a mirror ?:-) >> >> ...Jim Thompson > >Thats sounds simple. Every camcorder has something inside. >Well, only tape machines. > > >greg Years and years ago ;-) an associate and I were dabbling in improving the efficiency of evaporative coolers. In the process of our research we found instruments that used a Peltier cooler, cooling a mirror, to locate dew point. It would seem that an angled light beam reflecting off a mirrored surface would do the trick... you don't need cooling. I'd detect loss of reflection, then run for a timed period ?? ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | The only thing bipartisan in this country is hypocrisy |