Gas meter from Xiaomi/Aqara door sensor (ZigBee)

argonid · February 20, 2022, 12:02pm

I found now out what the problem was:

No reset since the February update. and other state class.

Just use this and it will work!

sensor.gas_leser:

sensor.gas_leser:
  state_class: total_increasing

Lakini · February 22, 2022, 10:57pm

Hey everyone, great project, looking into this as well. What’s your experiences with battery life so far? Thinking about trying it with the Lidl window contact, and replacing the AAAs with AAs.

mpetcu · February 23, 2022, 8:05am

From my experience until now and my calculations if you are a “home user” and your average consumption per month is about 250m3 of gas in winter and about 10m3 in summer.
Your sensor will open/close about 800 times per day in winter for about 3-5 months the rest we can assume is normal usage for the sensor, battery of Xiaomi sensor is rated one year (cr2032) with normal usage so determined that the normal battery will last no more then 3-4 months in winter.(not taking in consideration the cold temperature that will just destroy the CR2032)
I have added an AA 3.2V Feo4 rechargeable battery and since 4 months is still at 100% but the reading of the sensor is made for the CR2032 voltage curve so I do not trust the status.
If the Lidl sensor has AAA battery’s from the start I will not bother replacing them just test and see how much it lasts.

alanbarn · February 23, 2022, 11:16am

Hi all

Great project Marius.

New user here, so I’m still on the steep learning curve.

I have an Aqara sensor that I want to use to read my Landis and Gyr 750 meter (earlier post from another Aussie said that it will work (thanks mate!))

I have created everything, when I swipe the magnet past the sensor the counter increments. The Gas symbol displays on my energy dashboard, but I’m not reading any usage. I’m trying to get the working on the bench before moving to the Gas meter cabinet (which will be fun because it’s metal).

I have:

counter.gascounter

sensor.gasmeter

So after all that preamble here’s my setup in home assistant (which runs on a PI with an external HDD).


Automations:
================================================================

- id: '1645368831245'
  alias: Gas Counting
  description: Gas Meter Consumption
  trigger:
  - platform: state
    entity_id: binary_sensor.lumi_lumi_magnet_acn001_60c22500_ias_zone
    id: Aqara Gas Meter
    from: 'off'
    to: 'on'
  condition: []
  action:
  - service: counter.increment
    target:
      entity_id: counter.gascounter
  mode: single
  
  
  
 configuration.yaml
================================================================
 
  # Configure a default setup of Home Assistant (frontend, api, etc)
default_config:

# Text to speech
tts:
  - platform: google_translate

group: !include groups.yaml
automation: !include automations.yaml
script: !include scripts.yaml
scene: !include scenes.yaml
homeassistant:
  customize: !include customize.yaml

sensor:
  - platform: template
    sensors:
### Gas meter template from counter
      gasmeter:
        friendly_name: Gas Meter
        value_template: "{{ states ('counter.gascounter') | float * 0.01}}"
        unit_of_measurement: "m³"
        icon_template: "mdi:fire"
        device_class: gas


		
		
 customize.yaml
================================================================
 sensor.gasmeter:
  state_class: total_increasing
  last_reset: '2021-08-20T06:43:36.740703+00:00'

I’m obviously doing something wrong, but I can’t figure out what.

Any ideas please

mpetcu · February 23, 2022, 11:35am

You can start troubleshooting using the “developer tools” change the state of the sensor from off to on and see if you get the counter moving.

alanbarn · February 24, 2022, 1:33am

Thanks Marius

When i pass the magnet past the sensor

counter.gascounter    increments  by 1
sensor.gasmeter    increments  by 0.01
sensor.gasmeter_cost   increments  by 0.05

pepe59 · February 24, 2022, 12:38pm

Edit the template and you can delete the last_reset, no need

sensor:
  - platform: template
    sensors:
      gasmeter:
        friendly_name: Gas Meter
        value_template: "{{ states ('counter.gascounter') | float(0) * 0.01}}"
        unit_of_measurement: "m³"
        icon_template: "mdi:fire"
        device_class: gas

alanbarn · February 25, 2022, 6:46am

Removed the last_reset (from customize.yaml), now its showing cumulative reading in the Energy dashboard, and reading the counter pulses.

Thanks very much Pepe!!!

I hope that this helps others too.

gogobu · March 14, 2022, 1:40am

Hi, any updates on the battery usage? I’ve also got a Model 750 gas meter and want to implement something similar. Cheers!

K-1 · March 14, 2022, 2:16am

So far so good. However I think the real test will be in winter. when the gas heater is on.

KPoos · April 11, 2022, 5:50pm

Hi! Great project. I just want to do it as well. Can you give me the exact external reed sensor type/manufacturer u used?
Thanks,
Chris

mpetcu · April 12, 2022, 7:18am

The sensor will work with the built in reed sensor, follow the thread for more info.
As for you questions, the model I ended up is in the first picture, from www.tme.eu

krash · April 12, 2022, 9:16am

Hello everyone, i am trying to implement a similar solution but i am having some issues. Maybe someone can help.

I cannot find any reference or manual for my gas meter. It is a Sagemcom Siconia MG4 AT, as pictured below.

image930×990 77 KB
It does state the 1imp=0,01m3, but after 30 minutes of trying, I could not get the aqara sensor to trigger. I tried in several positions both with the meter running and with the meter stopped right in the point the last two digits change. Any idea which point i should check? or perhaps the aqara sensor is not good enough to sense the pulse?
As you might notice, the meter has a cable coming out, which terminates in 3 wires, red/blue-grayish/yellow. I am pretty sure i could hook this up to an esp and count the pulses (although very difficult as i dont have a power source near). Has anyone got prior experience on the details? Since i can’t find a manual, i have no idea what voltage i should feed it. Start with 3.3 and move to 5?

image587×514 50.9 KB

Sorry if i should have posted this in a different thread, will do so if needed.

mpetcu · April 12, 2022, 10:42am

Hi, this is nice! It looks to me that you already have the original meter reed already, you just need to figure out what wires are triggering the signal.
The wires in the last picture are as following:

common (common wire for tamper and reed signal)
reed signal (directly from the reed output, can be “normal open” or “normal close”)
tamper protection (basically it will open the circuit if the sensor is disconnected from the meter)

To figure out what is what you need an multimeter, I will connect the multimeter on random two wires and set it on continuity (beep) then consume some gas (following the “last two digits change”) and in case stops beeping (or is beeping in case is normal open) then you found the correct wires for signal. If you found the wires, then you need to solder then in place of the Aquara reed sensor.

krash · April 12, 2022, 11:38am

That was my first thought, and i tried it with a multimeter set on continuity, as you suggested, while the meter was running non-stop:

gray + yellow were beeping non stop
red + gray and red + yellow, never beeped.
red + gray/yellow (both on the other end of the multimeter) - no beep.

I’m confused, any ideas?

mpetcu · April 12, 2022, 1:17pm

assuming that the reed sensor inside the meter works correctly you have two cases:

normal open reed contact - multimeter will beep shortly while the last two digits will move
normal closed contact - multimeter will beep all the time and stop beeping while last two digits move

You only have 4 combinations of wires as there’s no polarity, you can’t damage anything in the electronic part of the gas sensor as long as you do not inject power to the wires.
You can just “wing it” and connect two wires to the Aquara sensor replacing the original reed (glass component) - follow the results in the next hours as the Home Assistant will tell you last triggered event of the sensor.

krash · April 12, 2022, 2:47pm

Thanks. I will investigate further and let you know.

There is no chance it’s a magnetic pulse sensor is in there that need +/- and signal right?

Also, do I need to remove the sensor from the chip? Or can I just solder the wires in parallel?

Edit:

Sorry, i was thinking about this, the combinations are 3 right?
red gray, red yellow, yellow gray. Is there a fourth that my mind does not grasp?

mpetcu · April 13, 2022, 6:41am

I’m 99% sure that inside the electronics are just one reed sensor and another mechanic switch, I remember that when I done my setup I have found the schematic for my optional GAS sensor. You already have it connected. In this case you will brake the sensors if you inject power in to the wires.
Yes, remove the Aquara sensor to connect the wires.
You are right, if you label the wires 1, 2, 3 the combinations are as following:1 and 2, 1 and 3, 2 and 3

mirekmal · April 13, 2022, 9:17am

In some sensors that are installed in Poland there are 2 reed sensors instyalled in parallel. One is close enough to magnet on the last reading wheel to generate signals as it spins, the second is far enough not to react to this movements and its role is to detect tampering the sensor with strong magnet placed next to sensor (which should stop actual sensor to react to spinning reading wheel). In such scenario it also get closed /open signaling to reader electronics abnormal operation. You can try to use such magnet to try to identify wires in your configuration.

krash · April 13, 2022, 2:25pm

If that was the case, at least one of the three wire combinations should give me a beep (or stop beeping) once every revolution. I get nothing unfortunately
I cant figure it out.