Thanks for the performance and power metrics, Vince. Precisely the kind of information for which I was looking.
I have 3.9.2 running the simulator on a 4GB Pi 4 as well. It's sitting around 45-46 C with a little fan, and I'm using a powered USB for now to handle the keyboard and mouse, etc. I wanted to use the Flirc cases, and I'd be interested to hear if you can cut a cable slot (with a Dremel tool or the like.) I want to use the Pi 4 with a camera to take a photo of my yard every 5 minutes, and I stared at the pictures of Flirc cases for some time. There seems to be no way to get a cable from the plug to outside the case. I like the idea of passive cooling, hence the Flirc stands out. Are there any hidden "braces," screw holes, etc. that might be a problem if one were to cut a small cable slot? I currently have a Pi 3+ taking the photos, and transferring them to a standard PC running weewx under CentOS. It's a "Rube Goldberg" software and hardware combination, and I think it'd be easy to have the Pi 4 do everything. Simple is always better. I have to get a second Davis logger/USB cable to test this with another console I've got so I can do a side by side comparison of my existing setup with Pi 4. The end game is to run this all headless except for the powered USB hub. I'll stick a USB 3.0 SSD on the hub to store my database on, as well as the photos, to reduce hammering at the SD card. I think I can do this and keep the temperature well under 50 C with a Flirc case if I can get the camera cable through it somehow. The Pi 4 throttles around 80 C, so we shouldn't have any trouble with that. Still, I like to keep electronics running as cool as possible, hence the USB hub idea. Anyhow, to keep this forum "weewx software support" oriented, I can report that weewx 3.9.2 runs like a charm on a Pi 4! - Paul VE1DX On Sunday, August 18, 2019 at 2:19:56 PM UTC-3, vince wrote: > > Some totally unscientific numbers - got my 4GB RAM pi4 and compared it > with a pi3 - both using wifi running weewx 3.9.2 in simulator mode, and > both in Flirc cases. Weewx was in debug mode with pyephem installed via > pip. Both systems have identical newly flashed A1 SD cards. The pi4 > uses a CanaKit pi4 power adaptor, the pi3 uses an old Aukey one I had > sitting around. > > Temperatures: > > - ambient = 21 C > - pi3 = 37 C > - pi4 = 44 C (it ran about 6 C or more hotter outside the case) > > Speed to do weewx things - initial run of Seasons report: > > - pi3 = 6.58 seconds to generate 57 images, 3.62 seconds to generate 8 > files > - pi4 = 3.44 seconds to generate 57 images, 1.66 seconds to generate 8 > files > > And the next run of the Seasons report > > - pi3 = 4.45 seconds to generate 42 images, 1.26 seconds to generate 8 > files > - pi4 = 2.28 seconds to generate 42 images, 0.68 seconds to generate 8 > files > > And the next run after that > > - pi3 = 1.00 seconds to generate 14 images, 1.26 seconds to generate 8 > files > - pi4 = 0.65 seconds to generate 14 images, 0.65 seconds to generate 8 > files > > So the pi4 is definitely faster, nominally twice as fast or so for running > the Seasons skin. Might be worth thinking about if you're a heavy user of > your existing pi. > > Power draw comparisons: > > - pi3 = 1.6 W > - pi4 = 3.1 W <= with great compute goes great power requirements :-) > > I also tried a couple SSD disks via USB3 enclosures. One a laptop SSD > drive, one a M2 SSD drive from a NUC. Both worked great. Both increase > the power needed by about 1.5 W according to a Kill-a-watt. > > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/1419609f-ddab-45d4-8672-05c262baa37e%40googlegroups.com.
