Virtual Temperature Sensor

[panser]

Hi.

I would like to create a virtual temp-sensor. This sensor should get data from existing sensors that's been selected. The outcome from this sensor should be the average from the selected sensors.
Example:

[SweetPants]

You can't

[panser]

You can't

That's why I want to suggest this as a new feature, so it might get implemented in next version.

[pwhooftman]

You can't

You can, if you are prepared to make a lua script which reads the various values from different sensors, calculates the average, and write that back to the virtual temp-sensor. You'll have to alter the lua script to select which readings to involve in the calculation of the average.

[SweetPants]

You can't

You can, if you are prepared to make a lua script which reads the various values from different sensors, calculates the average, and write that back to the virtual temp-sensor. You'll have to alter the lua script to select which readings to involve in the calculation of the average.

I meant with "You can't", you can't get the 'dropdown' menu's in the sensor as panser pointed out. The only way now is to create multiple sensors to display your readings.

[panser]

You can't

You can, if you are prepared to make a lua script which reads the various values from different sensors, calculates the average, and write that back to the virtual temp-sensor. You'll have to alter the lua script to select which readings to involve in the calculation of the average.

Interesting. Unfortunately I don't know LUA....yet =) I will start to learn.Is it possible to create a virtual temp-sensor? (How?)

Anyway, I still think the way I suggest (the screen-shot) would be a very easy and good way to do it.

As I have 6-7 temp sensor's outside, it would be grate to have one virtual sensor that gives me the average of all those 6-7 sensors to get a more accurate reading.

[SweetPants]

As I have 6-7 temp sensor's outside, it would be grate to have one virtual sensor that gives me the average of all those 6-7 sensors to get a more accurate reading.

There are two solutions:
1) You wait until the developers take up your request.
2) Create your own script(s)
a) GoTo Settings + Hardware and create a 'Dummy' hardware device
b) Create Virtual Sensors as per your requirement using the drop down list
c) Update the virtual sensor using Perl/Python and JSON API (http://www.domoticz.com/wiki/Domoticz_API/JSON_URL%27s) this requires some expericence with programming)
I think in your case that would be a cron job reading the current values from every sensor using JSON API, calculate the average and update the virtual sensor using JSON API.

[jfcjfc]

or only LUA, see lua script "heating control".
http://www.domoticz.com/forum/viewtopic ... =66#p11155

ALL ARE INSIDE :
five virtual and real temperatures
Tms = otherdevices_svalues['Tp-MS-Salon'] -- 131 => 156 / Real
Tb = otherdevices_svalues['Tp-Basse'] -- 73 / Virtual
Tv = otherdevices_svalues['Tp-Vacances'] -- 74 / Virtual
Th = otherdevices_svalues['Tp-Haute'] -- 72 / Virtual
Tex = otherdevices_svalues['Tp_EXT_E1'] -- 34 / Real
calculation
and two new virtual devices
commandArray['OpenURL']='192.168.0.3:8080/json.htm?type=command&param=udevice&idx=75&nvalue=0&svalue='.. Tsc -- Tmax = 45 - ['Tp_EXT_E1' / Virtual
commandArray['OpenURL']='192.168.0.3:8080/json.htm?type=command&param=udevice&idx=141&nvalue=0&svalue='.. Tdi -- 'T_TUYAU-E1_CHAUFF' - Tmax / Virtual

'ALL INCLUSIVE' except averaging ! ! !

[panser]

Hi,

I have now started to learn lua and got this working. It calculate average temp of my 5 temp sensors, and average hum of my 3 hum sensors and writes the hum stat from my sensor #1 to a virtual device. This happens once every one minute.
Please excuse any "bad programming" as im a n00b.
However it works

Code: Select all

tmp1, hum1, humstat1 = string.match(otherdevices_svalues['Device1'], "(%d+%.*%d*);(%d+%.*%d*);(%d+%.*%d*)")
tmp2, hum2 = string.match(otherdevices_svalues['Device2'], "(%d+%.*%d*);(%d+%.*%d*)")
tmp3 = otherdevices_svalues['Device3']
tmp4 = otherdevices_svalues['Device4']
tmp5, hum3 = string.match(otherdevices_svalues['Device5'], "(%d+%.*%d*);(%d+%.*%d*)")

commandArray = {}

time = os.date("*t")

if((time.min % 1)==0)then

local tempaverage = ((tmp1 + tmp2 + tmp3 + tmp4 + tmp5) / 5)
local humaverage = ((hum1 + hum2 + hum3) / 3)
local humstat = humstat1

commandArray['OpenURL'] = 'http://192.168.1.186:8080/json.htm?type=command&param=udevice&idx=194&nvalue=0&svalue='..tempaverage..';'..humaverage..';'..humstat

end

return commandArray

[Westcott]

Panser,

Just a suggestion, but if it is a 'time' script, it will run every minute, so you don't need the 'if((time.min % 1)==0)then' check.
Also, have you tried updating device 194 directly, rather than with json?
E.g. commandArray['UpdateDevice'] = '194|0|'..tempaverage..';'..humaverage..';'..humstat

[panser]

Panser,

Just a suggestion, but if it is a 'time' script, it will run every minute, so you don't need the 'if((time.min % 1)==0)then' check.
Also, have you tried updating device 194 directly, rather than with json?
E.g. commandArray['UpdateDevice'] = '194|0|'..tempaverage..';'..humaverage..';'..humstat

Westscott,
Thanks mate

I have changed the commandArray to use update directley istead of jason. Thanks.
Regarding timer, I actually use every 5min now: 'if((time.min % 5)==0)then'

Btw, do you know how I can use device idx 194 in other scripts?
like 'otherdevices_svalues[name of idx194]' ?

[Westcott]

There's a built-in function to get the device's index using its name -
idx = otherdevices_idx[device]

I wrote a small function to handle multiple updates in one Lua script -

Code: Select all

-- Index for CommandArray update
i = 1
-- The Update function
function UpdateDevice(device, data)
    -- Get the device index from its name
    idx = otherdevices_idx[device]
    commandArray[i] = {['UpdateDevice'] = idx..'|0|'..data}
    i = i+1
end

-- Call it like this from your code
UpdateDevice('<deviceName>', '<yourData>')

[panser]

Westcott, thanks a lot

I found one issue with my pgrogram:

Code: Select all

tmp1, hum1, humstat1 = string.match(otherdevices_svalues['Device1'], "(%d+%.*%d*);(%d+%.*%d*);(%d+%.*%d*)")

tmp1 (%d+%.*%d*) will return -1.0 as 1.0 - How can i make it to include the "-" as it is freezing outside ?

[Westcott]

Have a look at this -
http://www.lua.org/pil/20.2.html

I think it will be -
(%-?%d+%.*%d*)
or
([+-]?%d+%.*%d*)