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by Gavinmc42
Mon Jan 21, 2019 9:58 pm
Forum: General discussion
Topic: 64-bit operating system
Replies: 333
Views: 34760

Re: 64-bit operating system

While waiting for a 64bit Debian based Raspbian use another 64bit OS that works. I'm using Gentoo64, mostly because of Sakaki's brilliant support. Eventually Aarch, Suse, Fedora, Ubuntu etc will make easy to use and reliable versions too. Debian version will then easier, most issues already solved f...
by Gavinmc42
Mon Jan 21, 2019 7:50 am
Forum: Off topic discussion
Topic: Wind Turbine: possible power supply
Replies: 7
Views: 177

Re: Wind Turbine: possible power supply

Try with a stepper motor instead of a brush DC motor, works better at lower RPM.
Rectified and capacitor smoothed and charge a battery then 5V SW regulated.
Powering it directly is asking for trouble, wind power is not very reliable unless you live in a location that is windy all the time.
by Gavinmc42
Mon Jan 21, 2019 6:37 am
Forum: Other projects
Topic: Eventually your Pi will be able to do this
Replies: 3
Views: 524

Re: Eventually your Pi will be able to do this

Pi's with single chip 60GHz radar
https://www.digikey.com.au/en/product-h ... uation-kit

Ultrasonic, laser and now radar range finders.
by Gavinmc42
Mon Jan 21, 2019 3:05 am
Forum: Gentoo
Topic: ebuilding 64bit games
Replies: 10
Views: 4279

Re: ebuilding 64bit games

Minetest will build. Minecraft server as well, see another post Going through the ebuild dev-games/ list there are a lot of useful stuff for making games etc. Many games don't have Aarch64 ebuilds and expect x86 etc but a few do, it takes time to test which build easy. One big one is Openscenegraph ...
by Gavinmc42
Sun Jan 20, 2019 3:56 am
Forum: Gentoo
Topic: Minecraft server
Replies: 6
Views: 164

Re: Minecraft server

Thanks Sakaki, yet another very comprehensive and educational post. There is a world of difference between guessing it might work and knowing how to make it work :D You definitely know how push these little Pi's and get the best from Gentoo. A decade or so ago gamer's used to run lan parties, even t...
by Gavinmc42
Sat Jan 19, 2019 11:26 am
Forum: Gentoo
Topic: Minecraft server
Replies: 6
Views: 164

Re: Minecraft server

Minetest works and being opensource is hackable ;) Time to get more of my Pi's up and running to try multiplayer. Also time to go through the Gentoo emerge list and try other stuff. Been learning OpenGL to learn how to make games. Cubeworld games looks like a good place to start. Gentoo64 is also a ...
by Gavinmc42
Sat Jan 19, 2019 8:25 am
Forum: Gentoo
Topic: Minecraft server
Replies: 6
Views: 164

Minecraft server

Minecraft server needs a 64bit OS, will it work on a Pi3B+? https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=231618 Main dependency seems to be PHP. The emerge version does not install the extensions Minecraft needs - bcmath, curl, pthreads, sockets, yaml, zip. Probably best to run without X1...
by Gavinmc42
Fri Jan 18, 2019 4:00 am
Forum: General discussion
Topic: RISC-V
Replies: 89
Views: 2903

Re: RISC-V

De0 boards are expensive to play with Prop2, I've been having more fun(pain) with Pi's ;) But the Lattice boards are very interestingly priced now. The finance manager has yet to be approached about that UPDuino with camera/vision system kit ;) Perhaps after I get the new camera system installed, th...
by Gavinmc42
Fri Jan 18, 2019 1:54 am
Forum: Gentoo
Topic: Updated 64-bit Gentoo Image for RPi3 Released (now also for RPI3B+)
Replies: 93
Views: 27425

Re: Updated 64-bit Gentoo Image for RPi3 Released (now also for RPI3B+)

Again a very informative post. Yep Lin had very good explanation and it got me thinking and yes someone has already done it. WASM as native code for FPGA CPU. https://github.com/WebAssembly/design/issues/1050 https://github.com/lastmjs/wasm-metal Buried in the Browsers is more Compilers, just when I...
by Gavinmc42
Thu Jan 17, 2019 10:07 am
Forum: General discussion
Topic: RISC-V
Replies: 89
Views: 2903

Re: RISC-V

For the Raspberry Pi3B+ .... 132 bytes?
Ha ha, beats my Free Pascal version which was about 1MB ;)
I might brush up on my C coding ;)
by Gavinmc42
Thu Jan 17, 2019 7:19 am
Forum: General discussion
Topic: switching to 64bit kernel
Replies: 6
Views: 224

Re: switching to 64bit kernel

I use Gentoo64
https://github.com/sakaki-/gentoo-on-rpi3-64bit

The PINN version of Noobs allows for a Gentoo64 OS install.
https://github.com/procount/pinn

There are many other choices too, but I have not tried them.
viewtopic.php?t=142574
by Gavinmc42
Thu Jan 17, 2019 5:23 am
Forum: General discussion
Topic: RISC-V
Replies: 89
Views: 2903

Re: RISC-V

In Free Pascal it is called RTL Run Time Library. The Go runtime also includes the big number math like karatsuba... Rust like C has a very small run time, so google tells me. Run times are used for things like puts("hello world"); Using puts to writeln to console serial port or console screen (crt)...
by Gavinmc42
Thu Jan 17, 2019 2:02 am
Forum: General discussion
Topic: RISC-V
Replies: 89
Views: 2903

Re: RISC-V

Learning about compilers you run into the RTL's. These Run Time Libraries can be big depending on which language is used. I think the equivalent for C is the libc library? I suspect C will always compile the smallest baremetal exe file. Baremetal for RISC-V would be for memory constrained devices li...
by Gavinmc42
Wed Jan 16, 2019 12:48 pm
Forum: Gentoo
Topic: Lazarus/Free Pascal
Replies: 11
Views: 5090

Re: Lazarus/Free Pascal

Latest 3.3.1 Aarch64 fpc is compiling but manual installation needs more manual reading. Normal installs to Windows and x86 Linux is well documented,but those install scripts work anyway. Path issues means cut and pasting missing files to where they can be found. Hello is a 1MB+ executable file as i...
by Gavinmc42
Wed Jan 16, 2019 6:42 am
Forum: Raspbian
Topic: Is Raspbian’s Chromium version too old to cut the mustard?
Replies: 22
Views: 3450

Re: Is Raspbian’s Chromium version too old to cut the mustard?

What's 71 like in Raspbian?
We are using 72 in Gentoo64 and the WebGL Aquarium now runs - slowly ;)

How to speed up WebGL?
Is it using OpenGLES hardware acceleration or software?
by Gavinmc42
Wed Jan 16, 2019 3:30 am
Forum: General discussion
Topic: Need help on measuring a set of batteries
Replies: 10
Views: 881

Re: Need help on measuring a set of batteries

Coulomb counting, measuring the current going into the battery pack and going out of pack, more fun and games. A proper system will log this data over time and can be used to record diminishing battery capacity. Very important for range anxiety issues, even more important when most of us will be usi...
by Gavinmc42
Wed Jan 16, 2019 3:05 am
Forum: Other projects
Topic: Eventually your Pi will be able to do this
Replies: 3
Views: 524

Re: Eventually your Pi will be able to do this

Brilliant, it's like phased array radar but with sound on one chip.
Hmm good for fish finders too?

Every year the StarTrek medical Tricorder becomes more real.
A few hundred years ahead of fiction?
Bluetooth 5.0 Comm badge next?
by Gavinmc42
Wed Jan 16, 2019 1:59 am
Forum: Python
Topic: Python Graphics...
Replies: 8
Views: 678

Re: Python Graphics...

I have manipulated the widths to center things up. Of course, all this goes away if someone resizes the app.
That's why I moved to JavaFX and then OpenVG, autoscaling ;)
by Gavinmc42
Wed Jan 16, 2019 1:09 am
Forum: Gentoo
Topic: Updated 64-bit Gentoo Image for RPi3 Released (now also for RPI3B+)
Replies: 93
Views: 27425

Re: Updated 64-bit Gentoo Image for RPi3 Released (now also for RPI3B+)

Yep zswap whatever that is, seems to help :D If I read that explanation right, as well as being faster it could save some uSD card wear too? I got up to 3fps for Aquarium, which is pretty amazing as it did not crash Gentoo. If you think about it, this could be WebGL code (OpenGLES) converted to Open...
by Gavinmc42
Wed Jan 16, 2019 12:44 am
Forum: General discussion
Topic: Need help on measuring a set of batteries
Replies: 10
Views: 881

Re: Need help on measuring a set of batteries

Charging batteries, and keeping track of their charge status seems to be a "black art", not nearly as simple as naive users might think. Even non naive users don't like them, but with the right equipment we tolerate them because of their energy density. But any electric model plane or drone flier w...
by Gavinmc42
Tue Jan 15, 2019 11:58 am
Forum: Gentoo
Topic: Updated 64-bit Gentoo Image for RPi3 Released (now also for RPI3B+)
Replies: 93
Views: 27425

Re: Updated 64-bit Gentoo Image for RPi3 Released (now also for RPI3B+)

Both the new Firefox and Chromium seem to be fine up to 10 tabs, Chromium now using less memory? Swap and zram changes improves things? WebGLsamples Aquarium still the ultimate stress test. I think they fail cleaner than the last time I tested, Gentoo still runs, last time i needed to pull power? Wh...
by Gavinmc42
Tue Jan 15, 2019 2:41 am
Forum: General discussion
Topic: Need help on measuring a set of batteries
Replies: 10
Views: 881

Re: Need help on measuring a set of batteries

Just measuring the pack voltage does not give a perfect cell voltage reading unless the cells are balanced. Horrible things Lithium Ion packs, you need chips like the BQ76940 cell monitor which will do 9 to 15S cells. 48V is typical of EV bikes, big drones etc The BQ769xx family have an i2c port so ...
by Gavinmc42
Mon Jan 14, 2019 11:49 pm
Forum: General discussion
Topic: Need help on measuring a set of batteries
Replies: 10
Views: 881

Re: Need help on measuring a set of batteries

I use LTC2945, it goes up to 60v and can do current and power.
There are others that go to 80v.
Has inbuilt ADC with i2c interface.
by Gavinmc42
Mon Jan 14, 2019 11:47 pm
Forum: Python
Topic: Python Graphics...
Replies: 8
Views: 678

Re: Python Graphics...

Try pygame, it works for me.
Kivy is a fancy UI that can make apps.

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