Pulse sensor for water meter (reed relay)

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jgrad
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Pulse sensor for water meter (reed relay)

#1 Post by jgrad » 01 Jun 2020, 09:50

Can somebody suggest where to find suitable pulse sensor for watermeter from appended picture.

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TD-er
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Re: Pulse sensor for water meter (reed relay)

#2 Post by TD-er » 01 Jun 2020, 11:16

Some of those water meters have a magnet in the dial that rotates at the highest frequency.
You could then use a Hall-effect sensor to detect pulses.
A glass reed switch is then not the best suitable.
Some of these Hall-effect sensor boards have a LED, so it can then be moved over the glass to locate the magnet's position.
Then you need to use some water to see if you found the right spot for pulse counting.

Some Hall-effect sensor boards also have a trimmer to set the sensitivity.

jgrad
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Re: Pulse sensor for water meter (reed relay)

#3 Post by jgrad » 01 Jun 2020, 11:34

I prefer reedrelay because reading of pulses will be on location without power supply and ESP will run on battery with longest possible deepsleep period.

TD-er
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Re: Pulse sensor for water meter (reed relay)

#4 Post by TD-er » 01 Jun 2020, 11:39

But then you will miss pulses, if the ESP is in deep sleep.

And a hall effect sensor can also be seen as functionally similar to a reed switch.
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dontsovcmc
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Re: Pulse sensor for water meter (reed relay)

#5 Post by dontsovcmc » 07 Jun 2020, 01:08

Only deepsleep is't a solution for batteries. I use attiny for counting and ESP-01 for trasmiting (MQTT or HTTP): https://www.hackster.io/dontsovcmc/waterius-4bfaba

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