Gazpar counter via Zigbee switch button

[oxygen]

Hi all,

This is an workaround to connect easily/on the cheap the French Gazpar "smart" counter to domoticz using a Zigbee switch connected to the Gazpar output, based on the following setup.
I thought it was worth sharing as I couldn't find any example.

https://www.auto-domo.fr/home-assistant ... on-gazpar/

Overview:
The gazpar counter produces a dry contact for every 10L of gaz (1dm3) used.
This dry-contact/2pin output is connected to (any) Zigbee switch. A hit is then sent by the Zigbee switch every 10L.
This Zigbee switch is registered into domoticz (in my setup via a raspbee/deCONZ plugin)
And then parsed via a dzevents script into a virtual Gaz Counter into Domoticz.

In my setup, i'm using a IKEA/Somrig button.
https://www.ikea.com/fr/fr/p/somrig-lan ... -50560334/
https://github.com/dresden-elektronik/d ... utton.json
https://raw.githubusercontent.com/dresd ... _maps.json

Ikea/Somrig button in Domoticz has (up to) 10 different states.
Even states are for one of the two buttons.
Odd states are for the other one.

• 10/20 is for a single short hit
• 30/40 is for a double hit
• 50/60 is for a long hit

(I couldn't find actions generating the values for 70/80/90/+)

In order to ensure all works, i've configured both in the dzevent script.

Simplified overview
Gazpar <--cable--> Ikea/Somrig Zigbee Switch {{<== Zigbee Radio Waves ==>} Raspbee/deCONZ <-- Ethernet --> Domoticz/zigbee plugin

Here is the dzevents script:

Code: Select all

-- ************************************************************ 
-- ** Manage Gazpar virtual Counter from Zigbee drycontact   **
-- ** Triggered every time the Zigbee devices receives a hit **
-- **
-- ** Gazpar counter: 1 hit per 10dm3/10L
-- **
-- ** Zigbee device: Two buttons
-- ** Zigbee device: Single hit : 10/20
-- ** Zigbee device: Dual hit (2 hits in less than 1 sec): 30/40
-- ** Zigbee device: Long hit (1-long hit in more than 1 sec): 50/60
        
return {
	on = {
		devices = {
			-- Zigbee device called by the Gazpar Smart counter
			'Raspbee-Gazpar',
			-- Test Fake device for simulation / test purpose
			'raspbee-gazpar-test',
			}
	},
	logging = {
		level = domoticz.LOG_DEBUG,
		marker = 'Gazpar',
	},
	
	execute = function(domoticz, device)
	    --domoticz.log('trigger == > '..device.trigger)
	        
	    local current_gazpar = domoticz.devices("Gazpar-Zigbee").counter
	    local zigbee_hit = domoticz.devices("Raspbee-Gazpar").level
	    -- local zigbee_hit = domoticz.devices("raspbee-gazpar-test").level
		domoticz.log('Gazpar // Device ' .. device.name .. ' was hit with ' .. tonumber(zigbee_hit), domoticz.LOG_INFO)

	    if zigbee_hit == 10 or zigbee_hit == 20 then
    		-- Single hit = +10L
    		domoticz.log('Single hit', domoticz.LOG_INFO)
    		domoticz.devices("Gazpar-Zigbee").updateGas(current_gazpar * 1000 + 10)
    		domoticz.log('Gazpar // Upgrade m3 from ' .. tonumber(current_gazpar) .. ' to ' .. tonumber(domoticz.devices("Gazpar-Zigbee").counter), domoticz.LOG_INFO)
    	elseif zigbee_hit == 30 or zigbee_hit == 40 then
            -- Dual hit = two close hits = +20L
    		domoticz.log('Dual hit', domoticz.LOG_INFO)
    		domoticz.devices("Gazpar-Zigbee").updateGas(current_gazpar * 1000 + 20)
    		domoticz.log('Gazpar // Upgrade m3 from ' .. tonumber(current_gazpar) .. ' to ' .. tonumber(domoticz.devices("Gazpar-Zigbee").counter), domoticz.LOG_INFO)
    	elseif zigbee_hit == 50 or zigbee_hit == 60 then
            -- Long hit = probably an error, but +10L anyway
    		domoticz.log('Long hit', domoticz.LOG_INFO)
    		domoticz.devices("Gazpar-Zigbee").updateGas(current_gazpar * 1000 + 10)
    		domoticz.log('Gazpar // Upgrade m3 from ' .. tonumber(current_gazpar) .. ' to ' .. tonumber(domoticz.devices("Gazpar-Zigbee").counter), domoticz.LOG_INFO)
    	else
    		domoticz.log('Another type of hit // we do nothing', domoticz.LOG_INFO)
    	    -- Use this to "reset" the Counter values (usefull during resync/1st setup)
    	    -- domoticz.devices("Gazpar-Zigbee").updateGas(123456789)
    	end
    	
	end

}

[dartflag]

Hi Oxygene,
I saw your post and I'm trying to adapt your script.
Unfortunately I don't have the same with
My switch is always on
In domoticz, inclusion of the switch in Domoticz, I have 3 sensors

Capture d’écran 2025-07-20 à 09.35.59.png (134.43 KiB) Viewed 609 times

do you possible to use this kind of switch with your script? I am not script expert


thanks for help

Fred

[waltervl]

You have to see a switch moment (Off to On or On to Off) to have this working.
I presume this type of action switches normally are Off so it seems strange that yours is always On. Did you connect the switch wires correctly?

[dartflag]

hi
thanks for answer. found the solution

I adaptes the script like this and it works

Code: Select all

return {
    on = {
        devices = { 'TuyaZigbe_single' } -- Ton switch Zigbee Tuya
    },

    logging = {
        level = domoticz.LOG_INFO,
        marker = 'Gazpar',
    },



    execute = function(domoticz, device)
	
	  local compteurGaz = domoticz.devices("Gazpar-Zigbee")
	 
	  -- Valeur réelle affichée sur le compteur Gazpar (en m³)
	  		local valeur_initiale_m3 = 123.456
	  		local valeur_initiale_litres = valeur_initiale_m3 * 1000
	
	  -- Si compteur encore vierge (0), on l'initialise à la valeur réelle
			if compteurGaz.counter == 0 then
				domoticz.log('Initialisation du compteur virtuel Gazpar à ' .. valeur_initiale_m3 .. ' m³', domoticz.LOG_INFO)
				compteurGaz.updateGas(valeur_initiale_litres)
			end
	
       	 	if device.active then -- Switch a envoyé un statut "On"
          
            	local currentCounter = compteurGaz.counter -- en m3
            	local litres = currentCounter * 1000
            	local newLitres = litres + 10 -- Ajout de 10L
            	local newM3 = newLitres / 1000

            	domoticz.log('Appui sur switch détecté => +10L', domoticz.LOG_INFO)
            	domoticz.log('Ancien compteur : ' .. litres .. ' L (' .. currentCounter .. ' m³)', domoticz.LOG_INFO)
            	domoticz.log('Nouveau compteur : ' .. newLitres .. ' L (' .. newM3 .. ' m³)', domoticz.LOG_INFO)

            	-- Mise à jour compteur gaz
            		compteurGaz.updateGas(newLitres)
        	end
    end
}