Difference between revisions of "RPiWaterMeter"

From wiki.breedveld.net
Jump to: navigation, search
Line 1: Line 1:
 
'''
 
'''
This is the way I measure water-usage with my 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.
  
 
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, with a piece of aluminium it's easy to mount on the meter:
+
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:
 
<div class="res-img">
 
<div class="res-img">
 
[[File:RPi_watermeter_sensor.jpeg|640px]]
 
[[File:RPi_watermeter_sensor.jpeg|640px]]
Line 11: Line 12:
 
Shematics:
 
Shematics:
 
<div class="res-img">
 
<div class="res-img">
[[File:RPi_watermeter_schematics.jpeg|thumb]]
+
[[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.
I use a Raspberry Pi Cluster, so I can do a failover, pin 2,6 and 38 (if you use GPIO20) 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.
+
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:
 
First tested it with an experiment board:
 
<div class="res-img">
 
<div class="res-img">
[[File:RPi_watermeter_experiment.jpeg|thumb]]
+
[[File:RPi_watermeter_experiment.jpeg|640px]]
 +
</div>
 +
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:
 +
<div class="res-img">
 +
[[File:RPi_watermeter_board.jpeg|640px]]
 +
</div>
 +
I use a RJ11 connector to connect the sensor.
 +
 
 +
Complete mounted on the Pi:
 +
<div class="res-img">
 +
[[File:RPi_watermeter_complete.jpeg|640px]]
 
</div>
 
</div>

Revision as of 18:07, 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:

RPi watermeter sensor.jpeg

Shematics:

RPi watermeter schematics.jpeg

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:

RPi watermeter experiment.jpeg

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:

RPi watermeter board.jpeg

I use a RJ11 connector to connect the sensor.

Complete mounted on the Pi:

RPi watermeter complete.jpeg