Difference between revisions of "RPiWaterMeter"
| Line 1: | Line 1: | ||
''' | ''' | ||
| − | + | 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, | + | 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| | + | [[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 | + | 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| | + | [[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:
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:
