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I did have a question though... is there really a need for the external +5V supply. It looks like you could just wire this up directly to a sensor input channel.

I've ordered it. I have many of the DFRobot sensors in hand -- just not this one. I'll be posting something later about using their cheap level sensors as an alternative.

Or you can just buy this one from DFRobot for $6. It uses the same principle for 5 buttons on one input channel. Digikey carries them. Easy to wire up as is. If you really like the bigger buttons, you could remove these from the board and wire up external switches.

That would be a very good add.

There have been a few web pages that describe the two ports on the Octo 4-S Varios Controllers located above the float switch connector as two ethernet connectors (in and out) for a future controller. Coincidentally, those two connectors are GX12 4pin connectors that are identical to sensor...

We are definitely on the same wavelength! I was just thinking this morning that you should be able to create a generic flow rate sensor option where you specify the sensitivity. This is a generic request ;-).... Create a sensor option where you can specify the label (par for example) and...

Seems like the software is ready. However, you can't set the frequency sensitivity of the sensor. If you could do that, you could wire up one of the Gredia sensors from Amazon. I've thought about running the Gredia sensor into a frequency to voltage convertor and run that into a voltage...

I was wondering if there is a way to rewire the neptune/apex flow sensor as a sensor input to the hydros. I'm guessing that it is simply a digital input signal where you measure pulses per minute (or seconds).