51–60 of 95 posts
Yay, another thing i won't be able to find anywhere for a year, then find it for $25 with "only one per customer"and $15 shipping. I understand it's a global chip shortage, but when zero W came out, there wasn't one.
If you stacked multiple Pi boards on top of each other, connected through the GPIO HAT connector, could you network them?
Apologies, just woke up and coffee not kicked in. This is probably silly :)
EDIT: yes, I should search for this sort of thing before posting: https://forums.raspberrypi.com/viewtopic.php?t=127660
tl;dr "serial port, RS485 + SLIP of some sort, probably would max out at around 1Mbps, 4Mbps theoretically possible with small MTU's" and "There is no hardware reason why an RS485 network could not be used as the physical layer for at least 32 nodes, and with some of the RS485 driver chips, 127 nodes (they have stronger drivers)"
Earlier quoted context omitted.
Yes; check my blog post [1] or latest YouTube video [2] for details, but the tldr is 0.4W (80 mA) idle minimum for Zero W, 0.6W (100 mA) idle minimum for Zero W 2. Zero W goes up to 160 mA at load, while Zero W 2 gets up to 400-500 mA due to the three extra CPU cores. [1] https://www.jeffgeerling.com/blog/2021/look-inside-raspberry... [2] https://www.youtube.com/watch?v=lKS2ElWQizA
That's a big jump. Is there a way of getting Linux to disable a couple of cores?
I've been testing one for a couple weeks, and a quick rundown on it: it has a quad-core A53, same CPU/SoC core as the Pi 3, with 512 MB of RAM. This means it can run 64-bit Pi OS, but it is memory-limited and even some of the benchmarks I ran needed extra swap space to complete. But for anything that does run in the 512 MB of LPDDR2 RAM, it is at least twice as fast as the Zero/Zero W, and sometimes 3-8x faster, depe…
Does it overclock/throttle automatically like Intel? E.g. if I put some good cooling, will it run on faster frequencies?
Random thought upon reading the linked announcement: If you stacked multiple Pi boards on top of each other, connected through the GPIO HAT connector, could you network them? Apologies, just woke up and coffee not kicked in. This is probably silly :) EDIT: yes, I should search for this sort of thing before posting: https://forums.raspberrypi.com/viewtopic.php?t=127660 tl;dr "serial port, RS485 + SLIP of some sort, pr…
The issue with "stacking" is the pins on each board are not part of a bus but individual programmable io pins. Any stacking would require an intermediary board to isolate all these pins safely while adding the necessary TTL serial to 485 interface chips (e.g. Maxim max485).
CAN is similar to 485 where it's a 2 wire bus though it has smarter hardware which enables full duplex communication and any device can listen or transmit. Unfortunately it is pretty slow compared to Ethernet but plenty fast for its intended use.
Earlier quoted context omitted.
As for the RAM limitation, zswap is a great way to get some more RAM at cost of some CPU cycles which on the new Pi won't be an issue.
zram* zram is the compress-in-memory like you have in Windows and ChromeOS and zswap is the compress-on-disk in case you want to replace SD cards.
Yay, another thing i won't be able to find anywhere for a year, then find it for $25 with "only one per customer"and $15 shipping. I understand it's a global chip shortage, but when zero W came out, there wasn't one.