Difference between revisions of "RPiWaterMeter"
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Water usage mesurement with a Raspberry Pi''' | Water usage mesurement with a Raspberry Pi''' | ||
In my case I use Domoticz, but it also works with Home-Assist and other products. | In my case I use Domoticz, but it also works with Home-Assist and other products. | ||
| − | + | <br> | |
It works with a magnetic sensor, which can be used because of the half-metal rotor of watermeters in my country (Netherlands) | It works with a magnetic sensor, which can be used because of the half-metal rotor of watermeters in my country (Netherlands) | ||
For magnetic sensor I use the LJ12A3-4-Z/B from the well known company in China. You can use most types but be sure to by the OC (Open-Collector) version, while most sensors use higher voltages than a Raspberry Pi. | For magnetic sensor I use the LJ12A3-4-Z/B from the well known company in China. You can use most types but be sure to by the OC (Open-Collector) version, while most sensors use higher voltages than a Raspberry Pi. | ||
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[[File:RPi_watermeter_schematics.jpeg|640px]] | [[File:RPi_watermeter_schematics.jpeg|640px]] | ||
</div> | </div> | ||
| − | Because the sensor needs 9-36 Volt, while a Raspberry Pi only can deliver 5 Volt, I use an adjustable chopper (also from China), adjusted as 12 Volt. | + | Because the sensor needs 9-36 Volt, while a Raspberry Pi only can deliver 5 Volt, I use an adjustable chopper (also from China), adjusted as 12 Volt.<br> |
The output is connected to one of the GPIO, which first should configured as input, I use GPIO28 (pin38). | The output is connected to one of the GPIO, which first should configured as input, I use GPIO28 (pin38). | ||
The led will show if it works, for every pulse 1 liter water is detected. | The led will show if it works, for every pulse 1 liter water is detected. | ||
Revision as of 18:08, 23 December 2020
Water usage mesurement with a Raspberry Pi
In my case I use Domoticz, but it also works with Home-Assist and other products.
It works with a magnetic sensor, which can be used because of the half-metal rotor of watermeters in my country (Netherlands)
For magnetic sensor I use the LJ12A3-4-Z/B from the well known company in China. You can use most types but be sure to by the OC (Open-Collector) version, while most sensors use higher voltages than a Raspberry Pi.
With a piece of aluminium it's easy to mount on the meter:
Shematics:
Because the sensor needs 9-36 Volt, while a Raspberry Pi only can deliver 5 Volt, I use an adjustable chopper (also from China), adjusted as 12 Volt.
The output is connected to one of the GPIO, which first should configured as input, I use GPIO28 (pin38).
The led will show if it works, for every pulse 1 liter water is detected.
I use a Raspberry Pi Cluster, so I can do a failover, pin 2,6 and 38 are also wired to a second Pi, for the Power a diode is needed, for each Pi, while it's a bad idea to connect the power to multiple Pi's.
First tested it with an experiment board:
To test it on a pi you need the gpio command: if not installed: sudo apt-get update sudo apt-get install wiringpi change GPIO 28 (BCM=20 an pin=38) as input: sudo /usr/local/bin/gpio export 20 in Put this line somewhere in a startup file, so it will stay that way, after reboot, best below in /etc/rc.local (without sudo) to show the states: sudo gpio readall
This is the result:
I use a RJ11 connector to connect the sensor.
Complete mounted on the Pi:
