I used the RadioThermostat and a piece of software done by a fellow up in Canada.
I just replaced the whole HVAC system with two compressor evaporator multi-zone mini-split systems so the Radio Thermostat is no longer of use to me. If you want it holler, the API is open as I understand it. The thermostat is model CT80, here is the Radio Thermostat URL https://www.radiothermostat.com/ This is the fellow that does the code for remote control of the thermostat. https://play.google.com/store/apps/details?id=mpp.android.thermostat&hl=en_US&gl=US There is a comment about not having a CT80. He now does, I ended up with two of them we were trying to iron out a couple of issues, the other thermostat was here doing nothing so I sent it to him. Just holler and I will get it going your way. It is coming off of the wall as the mini-split system has thermostats for each room, so it is just a wall decoration now. On Fri, Jul 15, 2022 at 11:48 PM TomasK <[email protected]> wrote: > On Fri, 2022-07-15 at 18:07 -0700, Russell Senior wrote: > > On Fri, Jul 15, 2022 at 5:17 PM Tomas Kuchta > > <[email protected]> wrote: > > > > > > On Fri, Jul 15, 2022, 17:04 Russell Senior <[email protected]> > > > wrote: > > > > > > > I have used a bunch of these: > > > > > > > > https://www.amazon.com/gp/product/B00T0K8NXC/ > > > > and > > > > https://www.amazon.com/gp/product/B01G7BE9WK/ > > > > > > > > with https://github.com/merbanan/rtl_433 and an rtlsdr (like this: > > > > https://www.amazon.com/gp/product/B00VZ1AWQA/) to decode. > > > > > > > > For improved accuracy, I calibrated the sensors in an icebath (in > > > > several layers of ziplock bags and desiccant) for 0 degrees offset. > > > > . > > > > > > > > > These are good sensors with great battery life. I also have ThermPro > > > sensors, they work, but the ones Russell lists are better, smaller and > much > > > longer battery life. > > > > > > I do not calibrate them. I care about being comfortable and saving > power > > > rather than worry about whether the temperature reading is 0.2-0.3 > degrees > > > different from absolutely correct value. > > > > Fwiw, I didn't calibrate mine for a long time, but mine aren't so much > > for automated control, they were for understanding the temperature > > environments, and in particular differences and/or gradients in > > various microclimates. I noticed that a particular outside location > > seemed to get down to freezing before the other sensors. The > > significance of small temperature differences increases the closer you > > are to freezing, for example. Eventually, I just wanted to understand > > whether the difference was due to the sensor or the microenvironment > > it happened to be in. Unless vigorously stirred, there can be > > significant temperature differences over very short distances, due to > > heat sources, stratification, illumination, etc. > > > > I'd really like to have a lab grade temperature sensor, accurate to > > 0.01°C, to actually calibrate against. I encountered sensors when I > > worked in Oceanography with that kind of precision, but they were > > designed for water temperature and also were several thousand dollars. > > I wouldn't like to have one *that* much. Most consumer grade sensors > > only claim ±1°C. > > > > I was going to comment about - what atmospheric pressure did you calibrate > your > sensors at - then I had second thought thinking about relatively high > energy > needed/stored in H2O phase change which is connected to low dV (V-volume) > on the > opposite sides of liquid/solid phase. H2O is very interesting substance > indeed. > > Anyway, I checked the theory, so I would not fool myself with the other > smart > people here: > > This is because of the Clausius-Clapeyron equation > dlogT / dlogP = (P dV) / L > where T is the temperature of the phase transition, dV is the change in > volume, > and L is the latent heat. The water/gas transition has an enormous dV > because > gas is much less dense than water, so dT/dP is large. The water/ice > transition > has a dV about 10^-3, so dT/dP is small. > > There is some 'cost' L to be paid doing the phase transition, most of it > is paid > by thermal energy. If the volume changes during the transition, the P dV > work > can help lowering the necessary temperature. So, it makes sense that dT/dP > depends on the ratio of these two contributions. > > https://en.wikipedia.org/wiki/File:Phase_diagram_of_water.svg > > So, as a consequence - water boils at low temperature on Mt. Everest or in > space, but ice cream is about as difficult to make at low/high pressures > (unless > going above 1GPa+ (maybe there is a lot of ice(cream) in the middle of > sun/black-hole!) > > Happy weekend, it should be ideal for temperature observations (with > ice-cream) > -T > > -- Chuck Hast -- KP4DJT -- I can do all things through Christ which strengtheneth me. Ph 4:13 KJV Todo lo puedo en Cristo que me fortalece. Fil 4:13 RVR1960
