Add HomeWizard WiFi watermeter in Domoticz

[Broomer23]

Not sure this is the right place but I want to share my successfull addition of HomeWizard Watermeter in Domoticz.

First start by looking up the IP address the Watermeter is using.
Then add hardware type HTTP/HTTPS poller in domoticz using the url with IP address including the API:
http://your-ip/api/v1/data
The name for the hardware can be WaterMeter, but is arbitrary
Be sure to select GET as Methode
Use water.lua as command.

Now create two virtual sensors
Water - WaterFlow
WaterTotaal - Custom - axis label: m3
Note the IDX value of both virtual sensors

water.lua
Next you must create the script called water.lua (name is arbitrary, but use the same name everywhere)
Connect to your domoticz via Putty and and go to the directory where domoticz is installed.
Go to the subfolder .../domoticz/scripts/lua_parsers
create the file water.lua with sudo privileges.
Insert the following:

-- Read API values
s = request['content'];

--
-- Watermeter
--
local idWater = use the idx for the water sensor
local a = domoticz_applyJsonPath(s,'.active_liter_lpm')
domoticz_updateDevice(idWater,'',a*1000)

local idWaterTotaal = use the idx for the WaterTotaal sensor
local b = domoticz_applyJsonPath(s,'.total_liter_m3')
domoticz_updateDevice(idWaterTotaal,'',b*1000)

Save the file, goto Domoticz and watch until values appear in the sensors.

Success!

[AdAd]

Thanks for this.

i have only 2 questions.
1. Why multiplying active_liter_lpm by 1000? It's already in liters so no need to multiply
2. Why multiplying total_liter_m3 by 1000? if i compare it with the app the value that is pushed to domoticz is in m3 so it doesn't need to be multiplied. ("waterToaal" has the label m3 as you stated)

[Broomer23]

You are right. I also realized this later. I will change it. Thanks

[FireWizard]

Hello @AdAd and @Broomer23,

I wonder, if the conclusion, you made, is correct.

The API of the HomeWizard water meter provides the following data:

Code: Select all

{"wifi_ssid":"Name",
"wifi_strength":100,
"total_liter_m3":0.494,
"active_liter_lpm":0}

@AdAd wrote:

i have only 2 questions.
1. Why multiplying active_liter_lpm by 1000? It's already in liters so no need to multiply

I think this is correct, at least if you use a virtual sensor of the type General, Waterflow (See below)
The water flow is presented in l/min and in the JSON response you can see that it is a value of "active_liter_lpm".
So there is no need for a multiplication factor.

@AdAd also wrote:

2. Why multiplying total_liter_m3 by 1000? if i compare it with the app the value that is pushed to domoticz is in m3 so it doesn't need to be multiplied. ("waterToaal" has the label m3 as you stated)

This looks correct, but is not.

If you push the value of total_liter_m3 to Domoticz, which is in my case 0.494 m3 (= 494 liter), your total usage is correctly updated with the value added to the Offset. But the daily value (in the upper right corner) stays at 0 (zero).
In order to get a correct indication on your device, you have to multiply the value of total_liter_m3 *1000, so that you do not send m3, but liter.
In order to correct this, go to Setup > Settings > Meters/Counters and under "RFXMeter/Counter Dividers:" under "Water" insert 1000 as divider.

Screenshot_RFX_meter_dividers.png (41.83 KiB) Viewed 5823 times

It looks strange to multiply it first and then correct it again by dividing the value. But if you don't do that, it will show in the upper right corner always 0 Liter.

If everything is correct, it has to look as follows:

Screenshot_HomeWizard_watermeter.png (105.35 KiB) Viewed 5823 times

In my case the Offset has been 1472.405 m3.

Now you get your daily, monthly, etc, logging.

Regards

[gizmocuz]

Interesting device... I made myself a meter with a Proximity sensor (NPN) and a ESP8266, total costs about 10-15 euro. It outputs MQTT
Had to print a holder for the meter, so this seems like a nice and easy system that everyone can use

I understand you can connect a USB cable to this device. Does this mean you can power it from the USB? (No need for bateries)
Can you connect the USB to your computer and receive data as well

Do you have to enable API mode in the meter via the App like described below?

Code: Select all

Enabling the API
To access the data from an Energy device, you have to enable the API. You can do this in the HomeWizard Energy app (version 1.5.0 or higher). Go to Settings > Meters > Your meter, and turn on Local API.

[edwin1234]

Very nice,

I also have one, but have problems with the wifi,
Its in the meterput and there is isolation in it and around it with silver foil. I need to somehow extend the wifi antenna.
But dont no how.

[FireWizard]

Hello @gizmocuz.

I had already the idea, to create something myself as well The costs of this device is higher than yours 10-15 Euro, but it fits nice and you can install it in a few minutes. Other nice thing is you can remove it easily, if an employee of the water company want to read the meter. It is pity that there is no MQTT, so you have to poll the device.

For a complete review (in Dutch), see: https://www.iculture.nl/reviews/homewiz ... er-review/

I understand you can connect a USB cable to this device. Does this mean you can power it from the USB? (No need for bateries)

Yes, in the delivery, you will find a USB power supply (like for a smartphone), together with a fairly long USB cable (about 2m)

Can you connect the USB to your computer and receive data as well

Not that I'm aware of. I think it it is only for the power supply. At least I use it with the power supply, that has been delivered with the device.

If you do not use the USB power supply, you do not have (almost) real-time monitoring and also the API is not available.
With batteries it updates the app a couple of times/day. And indeed you have to enable the API. Disabled by default.

I believe most users will not use the API, except guys like you and me. The API is very simple. see: https://homewizard-energy-api.readthedo ... oints.html

@edwin1234.

I do not have that problem as I have an access point at about 2 m in the meter cabinet.
Wifi_strength is always at 100.

Regards

[gizmocuz]

For reference, hereby my sketch/document

https://github.com/gizmocuz/esp_proximity_sensor_mqtt

[AdAd]

Hello @AdAd and @Broomer23,

I wonder, if the conclusion, you made, is correct.


Now you get your daily, monthly, etc, logging.

Regards

You are totally right. The total value does indeed need a multiply by 1000. When i changed it i got the bars in the graph for the daily hourly usage. Thank you verry much.

[Hesmink]

In my case the Offset has been 1472.405 m3.

How did you get the offset in there?

[waltervl]

In my case the Offset has been 1472.405 m3.

How did you get the offset in there?

Should be an option in device widget button Edit

[FireWizard]

Hello @Hesmink

Go to your Watermeter widget and click "Edit".

Screenshot_WaterUsage_Widget.png (47.92 KiB) Viewed 5251 times

The "Configuration" screen will open and insert the desired value.

Screenshot_WaterUsage_Widget_Config.png (35.73 KiB) Viewed 5251 times

Insert the desired "Meter Offset" and click "Update".

Regards

[Hesmink]

Hello @Hesmink

Go to your Watermeter widget and click "Edit".


Screenshot_WaterUsage_Widget.png


The "Configuration" screen will open and insert the desired value.


Screenshot_WaterUsage_Widget_Config.png


Insert the desired "Meter Offset" and click "Update".

Regards

Got it. As per OP, I used the custom sensor, and you cannot add the offset there. I now updated it to a counter of type water. Issue solved, thanks.

[SanderRoelofs]

If someone is interested you can combine the p1 meter and water meter together in one script see: viewtopic.php?p=297035#p297035

Also voltage reading through telegram is possible.

[mvveelen]

I've added the watermeter as described in the OP and it works. I think. When I open the watertap, I see the flow but it's like:

Scherm­afbeelding 2023-04-21 om 12.06.27.png (101.04 KiB) Viewed 4475 times

Seems not correct, how can I change this?

[azonneveld]

Seems not correct, how can I change this?

OLD

Code: Select all

local a = domoticz_applyJsonPath(s,'.active_liter_lpm')
domoticz_updateDevice(idWater,'',a*1000)

NEW

Code: Select all

local a = domoticz_applyJsonPath(s,'.active_liter_lpm')
domoticz_updateDevice(idWater,'',a*1)

[mvveelen]

Ah, OK. That should do the trick.

I now face another issue. I followed the instructions in the OP and also followed the instructions to NOT use a custom sensor but a counter, but the first is useless because I can't adjust the offset and the second remains zero.

I'd like to change the offset so the current amount reflects what is on the meter itself. Any ideas?

[FireWizard]

Hello @mvveelen,

You wrote:

I've added the watermeter as described in the OP and it works. I think. When I open the watertap, I see the flow but it's like:

What do you mean with OP? Original Poster?

It looks like you mixed the "total_liter_m3" with "active_liter_lpm".

How do you send the data to Domoticz?
Can you share the script or in case, you use Node-Red, the contents of the Function node?

Regards

[mvveelen]

OP = Opening post

LUA script I've uploaded:

Code: Select all

-- Read API values
s = request['content'];

--
-- Watermeter
--
local idWater = 2099
local a = domoticz_applyJsonPath(s,'.active_liter_lpm')
domoticz_updateDevice(idWater,'',a*1)

local idWaterTotaal = 2100
local b = domoticz_applyJsonPath(s,'.total_liter_m3')
domoticz_updateDevice(idWaterTotaal,'',b*1000)

local idWaterVerbruik = 2101
local c = domoticz_applyJsonPath(s,'.total_liter_m3')
domoticz_updateDevice(idWaterVerbruik,'',c*1000)

2101 Watermeter Waterverbruik RFXMeter RFXMeter counter 234.263 m3
2100 Watermeter WaterTotaal General Custom Sensor 66 L
2099 Watermeter Stroomsnelheid water General Waterflow 0 l/min

Where did I go wrong you think?

[FireWizard]

Hello @mvveelen,

I have never worked with lua, but as far as I do understand this, it is allright.

Just a Question.

What is your setting in Setup >> Settings >> Meters/Counters for Water. This should be 1000.
And what is your setting in the "Water" widget if you press "Edit". See Counter Divider.
This should be 0 (zero). If this contains also 1000, then I understand your 1,000.000.

Regards