Termostat

[journeyman]

Hello,

Im trying to create some termostat for my heating on domoticz with blockly editor (im not good at programming at all so I use blockly module).

For now is like

2016-12-18_12h22_41.png (41.06 KiB) Viewed 2528 times

Its working but the problem is that I need to have some hysteresis. like 2.5degree over and below.
How can I create some variable which will take temperature from thermometer and add 2.5degree for turning on and subtract 2.5 for turning off?

Thank you

[Egregius]

Blockly can't calculate anything.
I would suggest start learning some script language like lua, shell, php,...

But, besides that, why do you want a hysteris of 2,5°C? I worked hard to get my script down to 0,1°C.

[journeyman]

So it will be more difficult

And what about user variables? There is no such function?


2,5 for central heating water pomp. it is typical for store thermostats and necessary to avoid too fast turning on, becouse temperature of water is going up when pomp is not working.

[Egregius]

Php isn't very difficult and has a huge userbase. Anything you can think of is already documented somewhere on the www.

[elmortero]

Hi Journeyman,
When I started using domoticz a year ago I was very happy for Blockly, but then soon realized that it is too limited for the events I wanted. So I started to try and use LUA. Short after that I discovered dzVents and that made life a lot easier for me, as I have (or rather had) no scripting experience.
You might want to have a look at dzVents too, it makes LUA scripting really easy. Now I only have dzvents based scripts, no more regular lua and zero blocklies
And, in your case, there is a great example script for room heating on which I based all my heating scripts.
You just need to change the names of devices to match yours in the first part (the lines that start with LOCAL).
For example in the line local BOILER_DEVICE = 'Boiler' you need to replace the word Boiler by the exact name of your switch that manages your heating source (in your case I think it is called Zasilanie Pompy C.O.)
Then put the script in the right folder and your done. On a pi that is /home/pi/domoticz/scripts/lua/scripts

[journeyman]

I did something like that:

Code: Select all

 local sonde = 'Kocioł C.O.'
 
 commandArray = {}

 if (devicechanged[sonde]) then
         local temperature = devicechanged[string.format('%s_Temperature', sonde)] 
   
        
       
             commandArray['Variable:kociolup3']=tostring(temperature + 2)
             commandArray['Variable:kocioldown3']=tostring(temperature - 2)

        
         end

 return commandArray

Its giving me user variable with temperature +/- hystereza to compare in blockly. Its working great but somtimes its giving in log

2016-12-18 21:14:00.465 Error: EventSystem: in Histereza: [string "..."]:7: attempt to index global 'devicechanged' (a nil value)

Why?