temp precision and hysteresis in C° mode

[oco89]

Hello Rob.

i would know if its possible to have more precision  in temp water screen  and calibration screen.

the screen temp display one decimal after the dot and i would 2. the same for the temp calibrate screen.


Regards and congratulation for this beautiful job.


PS sorry for my bad English .

[Rob F]

Hi oco89, glad everything is going good. I left it at one decimal for the home page because there wasn't room for 2 decimals, however it you press the temp on the home screen it'll show a min/max which is 100th's. For the heater settings page I do plan to add one decimal there.

The temperature calibration screen may be a thing of the past, I'll probably be removing it at some point as I'll need the space for better things.

[Irass]

heater settings
I set the temperature of 20 Celsius ON,
30 Celsius OFF. What is hysteresis?

[Rob F]

Hi Irass, sorry but I don't understand?

[fietsenrex]

https://en.wikipedia.org/wiki/Hysteresis

If I'm correct the robo-tank/code inside the controller doesn't provide a hysteresis on default.
the way you set it the hysteresis is about 10 degrees celcius.
it switches on below 20 and switches of above 30.
if you want a smaller hysteresis you should adjust one or two of the values to get it lower than 10.

example:
on at 25, off at 28.
now you have a hysteresis of about 3 degrees celcius

[olivier]

Hi all

So for watter change is necessary to have  the minimun temperature difference.

so the hysterisis of the thermostat to be 0.5°C

for this i would set temp 0.15°c per 0.15°c because you have also ds18b20 precision .


or the set temp today is  1°c of hysteresis with 9bit mode of ds18b20  so in reality you have around 1.2°c+/- of hysteresis and if you have some pound in your tank you have an big probleme...

sorry for my bad english.


regards

[Rob F]

Thanks fietsenrex for clearing that up. You explained it well.

Irass the schedule is overridden if you have a heater on that specific outlet, the heater settings take over.

Hi Olivier thanks for stopping in. When I get this update finished you could set it up so if the temperature changes to much the ATO shuts off.

I'm also going to the change the on/off values for the heaters to tenths so you could have it on at 73.4 and off at 73.7. Its setup so once its off it doesn't come back on until the low is reached so its not always coming back on/off.