How to read water meter's magnetic pulse? - Help needed

Hardware
1

Hey everyone,
I installed this Maddalena DS-TRP water meter on the main line inside my house, which comes “Pre-equipped for optional reed switch (1P=1-10-100-1000L) or static pulse emitter (1P=1-10L)”.

Their original reed switch has 4 installation positions, and measures pulses every 1, 10, 100, 1000Lt consumption.

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From the spec sheeti, It looks like it’s a simple reed switch:

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This part is currently unavailable here, so I am trying (unsuccesfully) to read the pulse with a simple reed switch I got off a door contact.

I have hooked the contact on an waveshare esp board using GPIO47 and gnd.

I have set it up as binary sensor (for now) and the switch works great with magnets.

binary_sensor:
#...
  - platform: gpio
    pin:
      number: GPIO47
      mode: INPUT_PULLUP
      inverted: False
    name: Contact Test

Unfortunately I have spend a lot of time with the meter running and trying to get a reading off the meter. It seems impossible.

I tried different contact sensors (all of them door sensors) and evern removed the reed switch from the casing with no luck.

  • Is it perhaps that my switches are not sensitive enough?
  • Maybe the magnetic pulse is too short and does not register?
  • Should i change the code to pulse meter to check?

I have some other sensors laying around: KY-003, KY-024 and KY-025. I dont know why, I just found them in my parts basket. Could any of them be of help? (although I would prefer to avoid having electronics near the water meter, due to humidity)

What am I missing?

Any help appreciated

2

Test the reed contact with a multi meter
It has to be in the position.

3

I did before installing, it beeps when near a magnet, not when the clock turns.
I was thinking maybe the contact was too short in time for the multimeter to register?

4

Did you rotated the reed contact?

5

Yes i have spend 20 minutes slowly moving the glass thingy around the surface of the meter. (while the irrigation was running)

6

Turning the reed contact it self, so that the contact is directed to the magnet.

7

What do you mean exactly, sorry.
I have opened the door contact plastic casing, and have just the glass tube hooked up.
There’s a correct direction that increases its sensitivity?
How do i figure it out? trial and error?

8

See here: https://standexelectronics.com/reed-switch-technology/magnet-interaction-effects-on-reed-switch-operations/
contact must be in the direction of the magnet.

9

I tried just now, all the directions, no luck unfortunately.

I used the KY-025 which has an indication led on it, and seems to be more sensitive than other door sensors.

Moved it around the meter, trying all directions.

No luck unfortinately