Create Raspberry Pi 4 image
Closed this issue · 3 comments
The current image only seems to work on a Pi 3 out of the box. It can be made to work on the Pi 4 but you need to tweak some stuff on the command line. It'd be easier for Pi 4 users to have an image that works without any modification.
Curious if there's any reason this can't work on a Zero. The Zero W has a 40 pin header (no stock connector), and seems comparably speced to the 3A. And...it's $10. Event better, the original Zero 1.3 is $5 at Adafruit, which is really attractive for something like this, which doesn't need USB hubs and HDMI ports.
I kind of expect it to be CPU limited. On a pi 3 A+ (or B+) with the quad core Cortex-A53 1.4 GHz, it gets about 300 samples per cycle. On a 4 b+ with its quad core Cortex-A72 1.5 GHz, it gets about 400 samples per cycle. A zero only has a single core and I keep one core pegged at 100% cpu 24/7 sampling the ADCs. I thread off calculating the power and posting it to the server since there are other cores available for that work. I have a feeling on a single core machine running java, the sampling would get all jacked up as garbage collection occurs during the computation and http call phase of each second.
I made a new image that works on both pi 3s and pi 4s. I also zipped it this time to make the download smaller. The new image is here
Closing this issue.