Water Meter - which sensor for pulse counting?

[journeyman]

Hello!


I have new watermeter in my home:



Which sensor for pulsecounting should I use? its look like the tips are non metalic?

I tryied with TCR5000 on one of the gauge but it looks like it doesent grabs/see tip movement?

[grovkillen]

Have you looked at this:

https://www.letscontrolit.com/wiki/index.php/LJ12A3

The hole in the middle, isn't that a optical communication port? (To the left of "pn 16" text.

[journeyman]

Inside this hole is some gearwheel with homogeneous shape is turning very fast when there is water flow.


LJ12A3 wil work with plastic?


I saw on pictures that another counters working with LJ12A# have some metal part (On top of this dial a half moon iron disc is attached) - I dont have such in mine meter.

[grovkillen]

LJ12A3 will probably work with that optical port since it is a metallic thing that is spinning.

[krikk]

i have not really finished this, but i have a similar water meter:

20170327_175610289_iOS.jpg (84.95 KiB) Viewed 6584 times

my idea was to monitor the the passing by of the red needle, which would mean 1 l of water... to monitor the passing by i wan't to use a TCS34725_RGB_Color_Sensor because the standard TCR5000 sensor is not very good at detecting red, especially if it is behind a plasic case..

...the TCS34725 sensor does have a interrupt pin, which would get activated when the before defined tresholds are reached, so basically i would setup the TCS34725 sensor to produce a interrupt every time the red needle is under it, then i can simple pulse count on the interrupt pin of the TCS34725 sensor...

...but so far only the code for the TCS34725 is implemented in espeasy, the interrupt part is still missing in the plugin code...

[toffel969]

Hello!


I have new watermeter in my home:



Which sensor for pulsecounting should I use? its look like the tips are non metalic?

I tryied with TCR5000 on one of the gauge but it looks like it doesent grabs/see tip movement?

TCR5000 should work fine on any of the red dials. I am using one on the electricity counter (these old ones with the wheel that has a red spot). In order to get it to work I had to:

Keep in mind, that TCR detects the IR-reflection, preferably the reflection of the IR-diode only

1. Make sure no ambient light is falling onto the gauge.
2. Adjust the sensitivity with the potetiometer onboard the TCR module
3. The module is put on straight (I had to build a little spacer, aproximatly 1mm thicker than the photodiodes stick out the board

[krikk]

yes the TCR5000 can measure the difference between red an white, but in my case i was only able to detect the difference when i was using the analog output of the TCR5000 sensor board, i was not able to to adjust the onboard potentiometer so that it would detect red vs white... (when measuring through transparent plastic) ...my mentioned sensor did work better for this case...