District warming

[remko2000]

I managed to read all the data from my Kamstrup 601. I now see, among other things, the total consumption in GJ. However, I also want to see what my daily consumption is. What is the simplest way to add this to domoticz with an extra dummy sensor?

[waltervl]

If you use the proper Domoticz device you should see your daily consumption already.
What device do you use to monitor the heating?

[remko2000]

I use this one:
https://haprofs.com/kamstrup-multical-s ... -domoticz/

[waltervl]

Yes, that is a bummer... They instruct to make custom sensors instead of counters for Heating GJ.

Better try to have them change that.

Can you post a couple of JSON messages from your meter trough

Code: Select all

http://ip_address_gateway:82/kamst-ir/api/read

Lets see if we can make up something.

[remko2000]

yes that is exactly the problem. But isn't it possible to work around this with, for example, some kind of script that passes the volume of the current day to a separate day counter?

[waltervl]

I am wondering what data this sensor creates. So that is why I asked for some sample jsons from you.

[waltervl]

The most interesting value is heat_energy. Is that an increasing value over days or is it reset to 0 every day?

[remko2000]

The rest api gives me this:

{"mac_address":"C0_49_EF_CE_E6_C4","gateway_model":"connectix_kamst-ir_gateway_v1.0","startup_time":"2024-01-27T19:05:12Z","firmware_running":"2024011002","firmware_available":"2024011002","firmware_update_available":"false","wifi_rssi":"-48","mqtt_configured":"false","heat_energy":"210.310","power":"0.000","temp1":"59.16","temp2":"51.24","tempdiff":"7.92","flow":"0.00","volume":"1491.420","minflow_m":"0.00","maxflow_m":"441.00","minflowdate_m":"240109.00","maxflowdate_m":"240109.00","minpower_m":"0.00","maxpower_m":"18.10","avgtemp2_m":"42.00","minpowerdate_m":"240101.00","maxpowerdate_m":"240109.00","minflow_y":"0.00","maxflow_y":"441.00","minflowdate_y":"240109.00","maxflowdate_y":"240109.00","minpower_y":"0.00","maxpower_y":"18.10","avgtemp1_y":"18.10","avgtemp2_y":"42.00","minpowerdate_y":"240101.00","maxpowerdate_y":"240109.00","temp1xm3":"109199.00","temp2xm3":"57580.00","infoevent":"1.00","hourcounter":"116625.00","power_act":""}

I think my kamstrup gives me every 900 sec a total of 'heat energy'

[waltervl]

Thanks!
Now the issue is, what does "heat_energy":"210.310" mean? Is it the Energy used for today or the total Energy value from when this meter is running? Similar like your electricity counter in your house.

So if tomorrow it shows for example "heat_energy":"210.710" It means you have used 210.710-210.310=0.400 GJ today. Then we can use this value for a counter.
If it tomorrow shows "heat_energy":"10.710" it means it is reset at night and you need scripting to get something done here.

[remko2000]

210.310 is the total energy.

So if tomorrow it shows for example "heat_energy":"210.710" It means you have used 210.710-210.310=0.400 GJ today. Then we can use this value for a counter.

This is right.

[waltervl]

Ah OK that seems promising

Then you could make a Dummy Counter named Heating (or what you wish) see also https://www.domoticz.com/wiki/Dummy_for ... es#Counter
After creation, press on Edit and make it a Custom Counter (type = Counter)
Value Quantity: Heating Energy
Value Units: GJ
Counter divider: 1000 (this is important).

Add in your Lua parser script kamstrup.lua in /domoticz/scripts/lua_parsers the following. It could be that the multiply 1000 line gives an error as the value is a string and perhaps not recognized as a fractal. Please report back if it gives an error.

Code: Select all

local idx = [IDX of new Counter]
local heat_energy = domoticz_applyJsonPath(request['content'], '.heat_energy')
heat_energy = heat_energy * 1000
domoticz_updateDevice(idx, '' , heat_energy)

First value could be high as it could report complete history. you can delete this high value the next day (shift+ mouse click on value in the Graph) and then you have normal values.

When everything works well you can delete the custom sensor and the lua code that fills this custom sensor.

[remko2000]

Thx
what I have now

IDX 251 is called 'heat_energy' (and gives 210,31GJ)
IDX 263 is my new dummy, zie screenshot


My code (in events, lua, type 'all'):

Code: Select all

local idx = 263
local heat_energy = domoticz_applyJsonPath(request['content'], '.heat_energy')
heat_energy = heat_energy * 1000
domoticz_updateDevice(idx, '251' , heat_energy)

I get an error:
' 2024-01-31 16:48:46.011 Error: EventSystem: in Dagtellerwarmte: [string "local idx = 263 ..."]:2: attempt to index a nil value (global 'request')'

[waltervl]

Thx
what I have now

IDX 251 is called 'heat_energy' (and gives 210,31GJ)
IDX 263 is my new dummy, zie screenshot


My code (in events, lua, type 'all'):

Code: Select all

local idx = 263
local heat_energy = domoticz_applyJsonPath(request['content'], '.heat_energy')
heat_energy = heat_energy * 1000
domoticz_updateDevice(idx, '251' , heat_energy)

I get an error:
' 2024-01-31 16:48:46.011 Error: EventSystem: in Dagtellerwarmte: [string "local idx = 263 ..."]:2: attempt to index a nil value (global 'request')'

Code: Select all

domoticz_updateDevice(idx, '251' , heat_energy)

should be

Code: Select all

domoticz_updateDevice(idx, '' , heat_energy)

You will have 2 Devices showing the GJ values. If it all works you can remove device 251 and the script part belonging to it.

[waltervl]

Beside my previous remark. You should not create a new script!!!
You should modify the Lua parser script kamstrup.lua in /domoticz/scripts/lua_parsers that you created according this instruction: https://haprofs.com/kamstrup-multical-s ... -domoticz/

[remko2000]

me wrong.

I changed it. Still error:
'2024-01-31 17:02:50.182 Error: EventSystem: in Dagtellerwarmte: [string "local idx = 263 ..."]:2: attempt to index a nil value (global 'request')'

Is LUA by events, type ' lua', type ' All' ......correct?

[waltervl]

Beside my previous remark. You should not create a new script!!!
You should modify the Lua parser script kamstrup.lua in /domoticz/scripts/lua_parsers that you created according this instruction: https://haprofs.com/kamstrup-multical-s ... -domoticz/

[remko2000]

sorry.

I edit the script kamstrup.lua and add your script at the bottom. Now I get indeed:


so far so good.....

[waltervl]

Lets let it run for at least 2 days.

[waltervl]

So after 1 day, do you see some usage graphs in the log page now? Device page showing some normal results?

[connectix]

Ah OK that seems promising

Then you could make a Dummy Counter named Heating (or what you wish) see also https://www.domoticz.com/wiki/Dummy_for ... es#Counter
After creation, press on Edit and make it a Custom Counter (type = Counter)
Value Quantity: Heating Energy
Value Units: GJ
Counter divider: 1000 (this is important).

Add in your Lua parser script kamstrup.lua in /domoticz/scripts/lua_parsers the following. It could be that the multiply 1000 line gives an error as the value is a string and perhaps not recognized as a fractal. Please report back if it gives an error.

Code: Select all

local idx = [IDX of new Counter]
local heat_energy = domoticz_applyJsonPath(request['content'], '.heat_energy')
heat_energy = heat_energy * 1000
domoticz_updateDevice(idx, '' , heat_energy)

First value could be high as it could report complete history. you can delete this high value the next day (shift+ mouse click on value in the Graph) and then you have normal values.

When everything works well you can delete the custom sensor and the lua code that fills this custom sensor.

Hi Walter!

Thanks for the script adjustments. I updated the instruction for the Kamstrup Multical for Domoticz so other users can benefit from it too.
Keep up the good work!

Greetings, Roel