pumpkinpi wrote:Not having used an analog to digital converter, what would work with the Pi?
Not had that much experience with ADC on the Raspberry Pi. Something like the Microchip MCP3424 might do, as used in the ADC Pi
board. I don't know if you can configure it for differential inputs. You'll need a separate power supply for the sensor than the Raspberry Pi.
The technology is well known. I have been buying this type of instrument for 15+ years for use in industrial plants to measure air flow. Why do you feel it would not last long outside? It just needs an appropriately designed enclosure. My feeling is that one with moving parts is more likely to fail.
Maybe my comment came across as dismissive; I'm sorry if it did. My experience is in anemometry for wind power in northern climates: if it can crack, freeze, get struck by lightning, shot at, get gummed up with bird poop/nesting bees, invaded by ants or generally go south in amusing and expensive-to-replace ways, I've seen it happen. I guess if you enclosed it carefully (potted it?) and recalibrated it regularly, it would work well. Its non-linear output and upper limit of ~19 m/s are the main issues for me. You'd likely never see 19 m/s in a domestic location, but old habits die hard.
Mechanical units (admittedly, the expensive ones I've used, like from Vector Instruments
and R. M. Young
; tip o' the hat to the MetOne dude who posted further up the thread — most wind turbines use MetOne ultrasonics) last pretty well, even in Canada. Replace the bearings every two years, get 'em recalibrated, and you can take the numbers to the bank. We're mostly moving to remote sensing (LIDAR or SoDAR) and I'm frankly glad never to have to build a 110 metre met tower ever again …
‘Remember the Golden Rule of Selling: “Do not resort to violence.”’ — McGlashan.