Re: WiFi range ...

On 02/08/2026 13:26, Carlos E. R. wrote:
> On 2026-08-02 03:30, c186282 wrote:
>> Now the wet bulb, how the hell do you KEEP it wet ?
> 
> And fungi free?
> 
>> This can be a PROBLEM depending on environment. Where I was, there
>> was surely a little rain every 7-10 days. A cheepo reservoir was
>> easy to rig. It's also possible to lace the wet cloth with a
>> chemical, ammonium nitrate for example, which is extremely
>> hydroscopic - but the chosen salt WILL affect the reading and
>> compensation will be needed.
> 
> 
AI Overview:

Humidity sensors measure water vapour in the air using capacitive,
resistive, or thermal conductivity methods. They track changes in
electrical properties or heat patterns when moisture is absorbed.

Capacitive Sensors
============
Structure: A moisture-absorbing (hygroscopic) material sits between two
metal plates (electrodes).

Action: The material absorbs water from the air, which changes its
ability to store an electrical charge.

Output: The sensor measures this change in capacitance and turns it into
a relative humidity percentage.

Resistive Sensors
===========

Structure: A pair of electrodes is coated with a material like a
conductive polymer or salt.

  Action: Absorbed moisture breaks down into ions, which changes the
electrical resistance across the coating.

  Output: Lower resistance means higher humidity, which the device
calculates into a reading.

Thermal Conductivity Sensors
===================

Structure: Two small heat-producing parts (thermistors) are used.

Action: One part is sealed in dry gas while the other is exposed to the air.

Output: Moisture in the air cools the exposed part differently than the
dry one, and the difference in resistance measures absolute humidity.
---------------------------------------------------------------------

Presumably any hygroscopic elements are soaked in fungicide at manufacture

-- 
The difference bweteen a psychopath and a saint is that the psychpoath
takes what he can and gives only what he must, but the saint gives
everything he can and takes only what he needs.