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by LimboMan
Fri Feb 19, 2021 4:53 pm
Forum: Other projects
Topic: minimum power requirements for red LED on 3B+
Replies: 0
Views: 127

minimum power requirements for red LED on 3B+

I was testing my solar panel on indoor light yesterday, and out of curiosity, remembered that the 3B+ has a power LED whenever a micro-USB is plugged in. Unlike the Pi Zero, which requires a microSD to indicate disk activity, the 3B+ will light up even if there is no uSD. I don't have a multimeter t...
by LimboMan
Tue Feb 16, 2021 5:33 pm
Forum: Other projects
Topic: E ink display tablet
Replies: 6
Views: 436

Re: E ink display tablet

The display you're using has the same driver, IT8951, that is being being worked on in this project: https://github.com/joukos/PaperTTY

https://www.youtube.com/watch?v=OiK_xBshSjQ

on a 9.7" https://www.youtube.com/watch?v=J5WbhSV2E_U
by LimboMan
Sun Jan 31, 2021 9:11 pm
Forum: Off topic discussion
Topic: Mac OS on rpi?
Replies: 12
Views: 1326

Re: Mac OS on rpi?

Aforementioned issues aside, the magic of the M1 is that the silicon is all integrated- memory, cpu in a way that make it more efficient than before. While the OS certainly takes advantage of that and is designed for it, it's mainly the silicon that is designed from the ground up that gives it the e...
by LimboMan
Mon Jan 25, 2021 2:40 pm
Forum: General
Topic: Is the raspberry foundation flipping blue?
Replies: 65
Views: 2522

Re: Is the raspberry foundation flipping blue?

LoRA has been seen working - Dave Akerman uses a Pico for that. I did buy a couple of modules so I could write some examples, but ran out of time. Wow, LoRA looks great. There is another thread that was recently made on the pico and wifi https://www.raspberrypi.org/forums/viewtopic.php?f=144&t=...
by LimboMan
Mon Jan 25, 2021 2:05 am
Forum: Off topic discussion
Topic: Arm vs riscv
Replies: 29
Views: 2917

Re: Arm vs riscv

As to the second point: I'm no expert but a casual knowledge of copyright law tells you that creative works are automatically subject to copyright law the moment they are created (published?). As such it is impossible to create a public domain work and as far as I can tell impossible to put a work ...
by LimboMan
Mon Jan 25, 2021 1:42 am
Forum: Off topic discussion
Topic: Arm vs riscv
Replies: 29
Views: 2917

Re: Arm vs riscv

I just started with FPGAs ,. My older son has done more, did buy Intel Cyclone 10 LP evaluation kit with 2x100Mbit ethernet (55k LEs, my biggest FPGA has 28K LEs), and flashed a riscv-core onto the FPGA and was able to boot it 2 days ago. It's fun stuff. A year or so ago I managed to get a picorc32...
by LimboMan
Mon Jan 25, 2021 12:50 am
Forum: General
Topic: Is the raspberry foundation flipping blue?
Replies: 65
Views: 2522

Re: Is the raspberry foundation flipping blue?

The pico is a cheap breakout board with the new mcu. Stick that together with a wireless comm of your choosing and you have a cheap solution for either industrial or personal uses. A very cheap board and quite incredible for what it is. I would rather have a cheap board I can add WiFi, Bluetooth, w...
by LimboMan
Mon Jan 25, 2021 12:18 am
Forum: General
Topic: Is the raspberry foundation flipping blue?
Replies: 65
Views: 2522

Re: Is the raspberry foundation flipping blue?

runs on 128k of RAM: http://retrobsd.org/wiki/doku.php/start This could be interesting to run on a Pico with USB keyboard input and a display driven via PIO. Compiling software on an MCU sounds fun. Yes, I am trying to do this with an ARM Cortex M4F https://ambiq.com/apollo4/ I'm also generally cur...
by LimboMan
Sun Jan 24, 2021 11:45 pm
Forum: General
Topic: Is the raspberry foundation flipping blue?
Replies: 65
Views: 2522

Re: Is the raspberry foundation flipping blue?

runs on 128k of RAM: http://retrobsd.org/wiki/doku.php/start

i'm curious if it would run uclinux https://elinux.org/System_Size#uClinux though it might be slow running in emulation mode without Cortex M4 architectur

for low power, could one add FRAM via SPI and CBRAM for storage ?
by LimboMan
Sun Jan 24, 2021 1:20 am
Forum: Off topic discussion
Topic: Arm vs riscv
Replies: 29
Views: 2917

Re: Arm vs riscv

Linux from Scratch is a fantastic resource for finding out how to build an operating system based on the Linux kernel. Covering everything from building the compiler you need to build the system, then the boot loader, kernel, init system, the shell, tons of libraries etc, etc. When I discovered the...
by LimboMan
Sun Jan 24, 2021 1:15 am
Forum: Off topic discussion
Topic: Arm vs riscv
Replies: 29
Views: 2917

Re: Arm vs riscv

It's that confusion between "Linux", the name of the kernel, and "Linux" used as a generic term to describe any operating system based on a Linux kernel. Heck, Windows 10 has a "Linux Subsystem For Windows" that runs much of the code one would run on a Linux operating ...
by LimboMan
Sun Jan 24, 2021 12:17 am
Forum: Off topic discussion
Topic: Arm vs riscv
Replies: 29
Views: 2917

Re: Arm vs riscv

Sadly all those RISC V processors you have linked to are not yet generally available in anything that we can buy. True, though it may be less than 5 months: "The aim is to ship PicoRio 1.0 in the first half of 2021." https://riscv.org/blog/2020/11/picorio-the-raspberry-pi-like-small-board...
by LimboMan
Sat Jan 23, 2021 3:57 am
Forum: Off topic discussion
Topic: Arm vs riscv
Replies: 29
Views: 2917

Re: Arm vs riscv

While MicroMagic's 5ghz chip doesn't have an MMU, there could still be uclinux installed on it. https://www.pulp-platform.org/ has a lot of great info on developments in the RISC-V field and also open hardware. The RV64GCVBH, TSMC 7nm, 3.5GHz mentioned by Crossbar looks interesting. 7nm would be sup...
by LimboMan
Tue Jan 19, 2021 5:26 pm
Forum: Other projects
Topic: Solar powering
Replies: 9
Views: 461

Re: Solar powering

if you are just using as a camera, you may want to look into an IoT device like https://www.digikey.com/en/product-highlight/s/seeed/gapuino-gap8-development-kit I know the cost may be more, but the power efficiency is better. They have a new board coming out soon, GAP9: https://greenwaves-technolog...
by LimboMan
Sat Jan 16, 2021 11:54 pm
Forum: Other projects
Topic: Dealing with brief powerbank interruptions
Replies: 7
Views: 358

Re: Dealing with brief powerbank interruptions

Not sure if this would help, but you could use a "pass-through" charger- it powers the Pi but the power bank can also be charged at the same time: https://voltaicsystems.com/v25/
by LimboMan
Wed Jan 13, 2021 12:04 am
Forum: General discussion
Topic: Is RaspberyPI NDAA (National Defense Authorization Act)compliant?
Replies: 31
Views: 1277

Re: Is RaspberyPI NDAA (National Defense Authorization Act)compliant?

Assuming this is a real post, it would/could be concerning what the military can purchase. For example: https://blink.ucsd.edu/technology/security/ndaa/index.html Puffergas, I believe your link is exactly correct. (This only applies to U.S. policy, however, not U.K.) From Wikipedia, "The Raspb...
by LimboMan
Mon Jan 04, 2021 12:34 am
Forum: Other projects
Topic: TI-30Xa Solar-like Raspberry Pi Laptop & Underclocking the Pi
Replies: 8
Views: 660

Re: TI-30Xa Solar-like Raspberry Pi Laptop & Underclocking the Pi

The smallest ARM system that I know of that's currently in production and can run Linux is the Allwinner F1C100s, as used in the Sipeed Lichee Nano . It's limited to 32 MB RAM, so it's going to be a very limited form of Linux. I may be interested in trying out the Lichee Nano: I've found a transfle...
by LimboMan
Sat Jan 02, 2021 3:09 am
Forum: Other projects
Topic: TI-30Xa Solar-like Raspberry Pi Laptop & Underclocking the Pi
Replies: 8
Views: 660

Re: TI-30Xa Solar-like Raspberry Pi Laptop & Underclocking the Pi

I've found an e-ink display forum as a great resource, so I've cross linked these threads: https://forum.ei2030.org/t/e-ink-low-power-cpu-solar-power-3-sides-of-the-same-lid/82 I've moved some of my research to the Tensilica LX6-based ESP32 boards such as the Firebeetle and the Inkplate on Crowdsupp...
by LimboMan
Sat Jan 02, 2021 2:43 am
Forum: Off topic discussion
Topic: solar powered laptop
Replies: 32
Views: 3441

Re: solar powered laptop

I've moved this thread to the Other Projects: https://www.raspberrypi.org/forums/viewtopic.php?f=41&t=296208 I've added some display & laptop research to this e-ink forum: https://forum.ei2030.org/t/e-ink-low-power-cpu-solar-power-3-sides-of-the-same-lid/82 This project doesn't have a single...
by LimboMan
Thu Dec 31, 2020 1:07 am
Forum: Other projects
Topic: TI-30Xa Solar-like Raspberry Pi Laptop & Underclocking the Pi
Replies: 8
Views: 660

Re: TI-30Xa Solar-like Raspberry Pi Laptop & Underclocking the Pi

Cortex-M chips typically run at 48-200 MHz. They have a small amount of RAM (32-1024 KB) and built-in Flash storage (again, of the same order). They might have some extra I/O ports, but they're basically microcontrollers. They can't really run an OS as we would recognize it. I've found why the Cort...
by LimboMan
Thu Dec 31, 2020 12:24 am
Forum: Other projects
Topic: Christmas Cyberdeck build
Replies: 3
Views: 250

Re: Christmas Cyberdeck build

Hey pi forum! Sorry if this is the wrong place for this. I just completed my first Cyberdeck build and the guys over at imgur suggested posting here as well! I couldn't tell you how many times I ended up here researching for this project, haha. Anyways, I ended up powering this little build with a ...
by LimboMan
Wed Dec 30, 2020 11:33 pm
Forum: Other projects
Topic: TI-30Xa Solar-like Raspberry Pi Laptop & Underclocking the Pi
Replies: 8
Views: 660

Re: TI-30Xa Solar-like Raspberry Pi Laptop & Underclocking the Pi

… The most critical applications of that smallest CPU would be medical, but a laptop could also use it.https://en.wikipedia.org/wiki/ARM_Cortex-M#Cortex-M0+ It is 32-bit so I wonder if Raspup http://raspup.eezy.xyz/ could run on it since it would run relatively fast on a slower ARM. That or a Win95...
by LimboMan
Wed Dec 30, 2020 7:14 pm
Forum: Other projects
Topic: TI-30Xa Solar-like Raspberry Pi Laptop & Underclocking the Pi
Replies: 8
Views: 660

Re: TI-30Xa Solar-like Raspberry Pi Laptop & Underclocking the Pi

Update2: Found a manufacturer of some of the lowest power SoCs: https://ambiq.com/apollo4-blue/ This article covers more background of modern lowest power CPUs: https://ece.engin.umich.edu/stories/michigan-micro-mote-m3-makes-history-as-the-worlds-smallest-computer "An Astonishing Lack of Power...
by LimboMan
Wed Dec 30, 2020 6:04 pm
Forum: Other projects
Topic: Solar Panel/Wind turbine real power measurement
Replies: 5
Views: 311

Re: Solar Panel/Wind turbine real power measurement

Cool project. There are some Arduino solar trackers that optimize the positioning of the panels to maximize the energy. https://www.instructables.com/Arduino-Solar-Tracker-Single-or-Dual-Axis/ I am trying to add a solar panel to a cyberdeck since it could fit all the tracking circuits behind the dis...

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