Humidity sensing - Page 2 - Electronic Circuits Projects Diagrams Free

Conradb · 13th November 2007, 03:08 PM

I think the danger of hijack feedback is low. Let's carry on and see what happens. (Keeping it in the same thread keeps the knowledge in one place.)
I have never tried building a capacitive humidity sensor, only a level-sensing one for rainwater tanks. So what kind of surface area and gap does one need? I am also thinking about dust messing with the dielectric properties in the gap, so long-term feasability is probably an issue? Most of all, protect the sensor, but in some way so as not to require airflow to still get a reading. I've just gotten some spare 5W ceramic resistors, so am very keen to un-cover how to 'modify' them and stand a chance of doing some kind of switching.

krazatchu · 18th November 2007, 02:07 AM

Hey~~

I was away for a while...

Already started a new thread here...

http://www.electro-tech-online.com/e...-resistor.html

Gordz · 18th November 2007, 10:50 AM

I like the idea of using a resistor with the coating removed as an RH sensor. It would be interesting to see how linear the change is in relation to the RH.

EDIT: Oops, I'll follow the link above.

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13th November 2007, 03:08 PM	(permalink)
Conradb	I think the danger of hijack feedback is low. Let's carry on and see what happens. (Keeping it in the same thread keeps the knowledge in one place.) I have never tried building a capacitive humidity sensor, only a level-sensing one for rainwater tanks. So what kind of surface area and gap does one need? I am also thinking about dust messing with the dielectric properties in the gap, so long-term feasability is probably an issue? Most of all, protect the sensor, but in some way so as not to require airflow to still get a reading. I've just gotten some spare 5W ceramic resistors, so am very keen to un-cover how to 'modify' them and stand a chance of doing some kind of switching.

18th November 2007, 02:07 AM	(permalink)
krazatchu	Hey~~ I was away for a while... Already started a new thread here... http://www.electro-tech-online.com/e...-resistor.html

18th November 2007, 10:50 AM	(permalink)
Gordz	I like the idea of using a resistor with the coating removed as an RH sensor. It would be interesting to see how linear the change is in relation to the RH. EDIT: Oops, I'll follow the link above. Last edited by Gordz; 18th November 2007 at 10:53 AM.