I got it hooked up this weekend and I’m playing around with the software now trying to dial it in. The installation looks way jankier than I would have hoped. I didn’t really have a good way to mount the flow valve horizontally so I rested it on top of the 2x4 that I used to mount the copper piping. Then I needed some way to hold it up there so I strapped it in using one of my wife’s old belts.
I installed all the pipe and returns yesterday and spent today wiring up the electrical and proving out the pulse meter. I got a quick scope shot of the output pulse to verify that everything works like I expected it to. This is with a 1kΩ pull-up to 3.3V, the active-low pulse is ~40ms wide.
I was pretty excited to test it out and based on the specs found here it looked like the device might send 100 pulses per gallon of water (spec’ing 0.01 pulses per gallon). Now that it’s hooked up, I can tell that it really only pulses once per gallon (also see spec
Output: Pulse Per 1 gallon). Other than that lack of fractional gallon resolution, it works well!
Because of the lack of gallon/time resolution, I’m trying to figure out how to calculate high-flow pressure drop in a way that is past-looking so it’s more accurate. I want to be able to determine “high-flow” state, and if it maintains for a whole minute, I can trust the data more and calculate a delta. There are still some blind spots since the trigger only happens once in 60 seconds…