Hi. I have some extremely basic knowledge of digital design. I'm used to just putting things together that have a SPI or I2c bus, or copying circuits I find online. But I haven't made any original circuits yet.
I'd like to create a flow meter converter. Most residential sprinkler irrigation flow meters output in .1/1/10 pulses per gallon. Some report using 'K and Offset' numbers.
I'd like to create a universal flow-meter converter. Basically, I plug this converter into the flow meter on one side, and into the sprinkler controller on the other side.
This will allow me to converting arbitrary pulses per gallon into a different pulses per gallon rate and send it back to the controller.
Here some flow meters:
(New user can't have more than 2 links in post, so dropping the .com above)
The problems I see right off the bat is that these flow meters only have 2 wires, positive and negative. Additionally, they want something like 36V DC.
So, I'd love to have some help into how to go about creating this circuit.
Since there are only two wires, I imagine that the pulses must travel on the red wire. How could you safely provide 36V DC and READ the signal from the red wire?
Ideally, I'd like to just plug my circuit into the existing controller for
- Power for arduino
- The arduino should send back a (different) signal back to the controller, after adjusting its rate.
Eventually, it would be cool to be able to combine (add) multiple flow meters into one, but I don't have this use case right now.
Heres the specs of the Everydrop flow meter
I imagine I'm going to need resisters and capacitors. Also, I would really like to understand the circuit so I can learn from it and for my next project. Thanks a lot!