Yeah, it could be the same sensor set inside. But Paul just has an old ISS where the sensor is located inside the screen just like ours in the newer version. I've linked a sensor spec page with a sensor that has identical specs as the old one actually in the ISS, please see one of my previous posts. You can find the actual part specs on the second link. In that PDF they spec the accuracy and give an RH/cap curve. My theory is that the old SIM board somehow measures a value linearly related to the capacity, and transmits that value as the actual raw value in the packets. If we consider the RH/cap curve linear, calculating the RH value might be as simple as a division by a fixed constant. For this rare case a linear function just might be good enough.
On Friday, March 29, 2019 at 10:51:02 PM UTC+1, [email protected] wrote: > > On Friday, 29 March 2019 18:40:14 UTC-3, kobuki wrote: >> >> We're dealing with the capacitive humidity sensor now, right? >> > > Yep! So far I couldn't find on the internet the formula for the Davis > polymer humidity sensor. Are we the first ones? Again??? > > This I found here: > https://www.davisinstruments.com/product_documents/weather/spec_sheets/7859_spec_Rev_D.pdf > > *"The humidity sensor is a thin film capacitor element. A dielectric > polymer layer absorbs water molecules from the* > *air through a thin metal electrode, which causes a change in capacitance > proportional to relative humidity."* > > Luc >
