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by plugwash
Sun May 31, 2020 10:33 pm
Forum: Advanced users
Topic: I think there's a bug in NOOBS with very large XDHC SD cards.
Replies: 31
Views: 1687

Re: I think there's a bug in NOOBS with very large XDHC SD cards.

I would suggest doing a few experiments to try and narrow down the cause

Does cluster size have an impact? does starting from a smaller partition on the larger card work?
by plugwash
Sun May 31, 2020 7:00 pm
Forum: Off topic discussion
Topic: Raspberry Pi mouse/keyboard
Replies: 3
Views: 926

Re: Raspberry Pi mouse/keyboard

Yes, the raspberry pi keyboard can be used on an android phone/tablet. I presume the mouse can too but I don't personlly own one to test (I have tested the keyboard in combination with other mice though). There are a couple of caveats to be aware of. 1. The phone/tablet must support host mode, some ...
by plugwash
Sat May 30, 2020 12:00 pm
Forum: Python
Topic: Python Packages Not Installing
Replies: 1
Views: 217

Re: Python Packages Not Installing

You need to use "pip3" to install stuff for python3.
by plugwash
Thu May 28, 2020 2:06 pm
Forum: General discussion
Topic: Why moving to 64bit?
Replies: 273
Views: 41257

Re: Why moving to 64bit?

I conclude that there is no downside in terms of performance or memory space with 64 bit over 32 bit and that anyone making such claims has not done any measurements and hence no not of what they speak. I conclude that you are taking one example and extrapolating too much. Your code deals with a lo...
by plugwash
Thu May 28, 2020 1:48 pm
Forum: Raspberry Pi OS
Topic: Goodbye Raspbian hello Raspberry Pi OS
Replies: 41
Views: 7529

Re: Goodbye Raspbian hello Raspberry Pi OS

Great,this will finally stop the confusion on the ARM vs x86 OS naming !! Raspbian.org has still says Raspbian is a community funded and supported free software effort. Note: Raspbian is not affiliated with the Raspberry Pi Foundation. Raspbian was created by a small, dedicated team of developers t...
by plugwash
Wed May 27, 2020 2:58 pm
Forum: General discussion
Topic: Security: "BIAS" - Bluetooth Impersonation AttackS
Replies: 11
Views: 927

Re: Security: "BIAS" - Bluetooth Impersonation AttackS

You need it to be birectional. The Pi end has a legal antenna and transmission power. I'll agree on the transmit power, but note that generally antennas are reciprocal, if the attacker has a high-gain antenna (that results in illegally high EIRP) that will improve range in both directions (at the c...
by plugwash
Fri May 22, 2020 12:36 pm
Forum: Off topic discussion
Topic: Python 2 EoL...at least in theory
Replies: 51
Views: 5045

Re: Python 2 EoL...at least in theory

They can almost certainly be automated. Worst case, write a Python 2 interpreter in Python 3 and you should be able to continue running Python 2 within Python 3. I haven't done anything very gnarly with Python, but 2 and 3 are mostly fairly compatible. The problem is python is such a dynamic langua...
by plugwash
Thu May 21, 2020 4:50 pm
Forum: General discussion
Topic: case/adapter soloutions for pi4 with HDD/SSD
Replies: 8
Views: 942

case/adapter soloutions for pi4 with HDD/SSD

Does anyone have any reccomendations for case/adapter soloutions for a Pi4 with HDD/SSD?

I'm aware of the geekworm one, but at £28 for the case, £36.39 for the adapter board and £18.59 for the power brick it's rather on the expensive side.
by plugwash
Thu May 21, 2020 3:14 pm
Forum: General discussion
Topic: 110V DC for USB-C Power Supply for Raspberry Pi 4
Replies: 27
Views: 1566

Re: 110V DC for USB-C Power Supply for Raspberry Pi 4

In general universal-input switch mode power supplies are designed for a range of nominal AC RMS input voltages from 100V (Japan) to 240V (former UK voltage). Beyond this they will have an allowance of about 10% for supply tolerances and maybe another 5% for volt drop in wiring, so the designers wil...
by plugwash
Wed May 20, 2020 5:13 am
Forum: General discussion
Topic: Need help identifying fried components
Replies: 14
Views: 751

Re: Need help identifying fried components

The tan color says those are capacitors not resistors. Those capacitors are clearly associated with the PMIC, which is U2 on the public schematic. So it should be possible with a bit of work with a multimeter to figure out which capacitor is which. The problem you may find is that when you physicall...
by plugwash
Sat May 16, 2020 5:02 am
Forum: Raspberry Pi OS
Topic: Broken Upgrade Mirror
Replies: 2
Views: 277

Re: Broken Upgrade Mirror

Can you try again? I just had a look on our side and it seems the mirror redirection system has detected the mirror as down, so you shouldn't be directed to it anymore.
by plugwash
Thu May 14, 2020 10:04 pm
Forum: General discussion
Topic: Largest SD card supported by PI hardware?
Replies: 21
Views: 1412

Re: Largest SD card supported by PI hardware?

Nope, section 4.3.14 explicitly states that SDHC/SDXC/SDUC cards use a fixed 512 byte block size.
by plugwash
Thu May 14, 2020 9:50 pm
Forum: General discussion
Topic: Largest SD card supported by PI hardware?
Replies: 21
Views: 1412

Re: Largest SD card supported by PI hardware?

2TB is the point at which a 32-bit count/index of 512 byte sectors hits it's limit. One problem that this causes is that pure MBR partitions tables are no longer useful. This can be worked-around using a MBR/GPT hybrid partition table but that isn't necessarily the only problem. It seems that since ...
by plugwash
Thu May 14, 2020 7:41 pm
Forum: General discussion
Topic: Largest SD card supported by PI hardware?
Replies: 21
Views: 1412

Re: Largest SD card supported by PI hardware?

Sizes up to 32GB should be fine. Sizes from 64GB up to 2TB should be fine if used with a raw image but installing noobs on such cards is problematic. I'm not sure what the largest card anyone has actually tested is though. Beyond 2TB there will definitely be issues to deal with, whether those issues...
by plugwash
Thu May 14, 2020 2:18 am
Forum: Beginners
Topic: Using screw and nuts
Replies: 4
Views: 274

Re: Using screw and nuts

#6 is way too big, #4 is probablly
W. H. Heydt wrote:
Wed May 13, 2020 9:43 pm
If you're planning to use SAE sizes, a 4-40 or 6-32 ought to be about right.
Umm no, a #6 has a major diameter of about 3.5mm which is way too big, #4 is about 2.85 mm which might fit but only barely. #3 would be the approximate equivilent of a m2.5.
by plugwash
Tue May 12, 2020 4:01 pm
Forum: Raspberry Pi OS
Topic: FreeCAD on PI4 and Raspbian Buster.
Replies: 98
Views: 21389

Re: FreeCAD on PI4 and Raspbian Buster.

I wonder if it's possible to switch to llvmpipe on raspbian and if-so what impact that has on freecad.
by plugwash
Sat May 09, 2020 6:04 pm
Forum: Raspberry Pi OS
Topic: When does LXDE end?
Replies: 15
Views: 885

Re: When does LXDE end?

The concern I see is that it uses gtk2, while gtk2 is not dead yet it's days are probably numbered given that we now have gtk4..........
by plugwash
Fri May 08, 2020 10:47 pm
Forum: Beginners
Topic: Why are 2 versions of chromium in the repos?
Replies: 8
Views: 1751

Re: Why are 2 versions of chromium in the repos?

One is from raspbian proper, the other is from the raspberry pi foundation/trading. Debian updates chromium to new upstream versions even in their stable releases because they have decided that backporting security fixes is unviable. Until recently raspbian proper did not contain chromium binaries (...
by plugwash
Mon May 04, 2020 4:53 am
Forum: C/C++
Topic: API
Replies: 11
Views: 617

Re: API

The problem is you are not giving the people trying to help you anything to work with! you didn't tell them what server you are using until it was pried out of you and you still haven't shown us your code or told us what API you are using, or why you think talking to more than one server with said A...
by plugwash
Sat Apr 25, 2020 3:57 am
Forum: General discussion
Topic: LEDs and resistors
Replies: 13
Views: 821

Re: LEDs and resistors

The basic principle of calculating resistor values is simple enough, subtract the forward voltage from the supply voltage and then divide by the desired current. The tricky bit is that forward voltage is not exactly constant, it varies a lot between different types of LED, but it can also vary a bit...
by plugwash
Wed Apr 22, 2020 8:34 pm
Forum: General discussion
Topic: ARMv7 emulation on ARMv6: System Control Processor
Replies: 13
Views: 848

Re: ARMv7 emulation on ARMv6: System Control Processor

[*] Thumb. ARMv6 only supports 16-bit Thumb-1 instructions, but ARMv7 added basically a 32-bit Thumb-2 equivalent for most ARM instructions, so that's a lot of Thumb-2 instructions to emulate. However, it seems gcc doesn't produce Thumb-2 instructions unless explicitly enabled, which could mean the...
by plugwash
Sun Apr 19, 2020 2:32 pm
Forum: Troubleshooting
Topic: RPi4 won't run PC-based oscilloscopes, kernel bug?
Replies: 27
Views: 2416

Re: RPi4 won't run PC-based oscilloscopes, kernel bug?

According to viewtopic.php?t=246348 you need to add "dtoverlay=dwc2,dr_mode=host" to config.txt
by plugwash
Sat Apr 18, 2020 11:08 pm
Forum: Troubleshooting
Topic: RPi4 won't run PC-based oscilloscopes, kernel bug?
Replies: 27
Views: 2416

Re: RPi4 won't run PC-based oscilloscopes, kernel bug?

A possible workaround might be to run the scope off the "old" USB controller, which is available on the USB C connector. IIRC you have to force it into host mode and you will have to rig up something to provide power but other than that it should be the same old controller you have used on the older...
by plugwash
Sat Apr 18, 2020 7:50 pm
Forum: Beginners
Topic: Are the Pi A+ models weaker than B+ models?
Replies: 2
Views: 192

Re: Are the Pi A+ models weaker than B+ models?

Generally there are two differences between A and B models Firstly A models do not have the "USB hub with Ethernet" chip and hence have only a single USB port and no Ethernet. Secondly A models have less ram than contemporary non-legacy B models. The CPU performance will be the same between an A mod...
by plugwash
Sat Apr 18, 2020 7:07 pm
Forum: Other projects
Topic: Long term powering of Raspberry pi 4B in remote forest
Replies: 34
Views: 2155

Re: Long term powering of Raspberry pi 4B in remote forest

I have done similar, some years ago. In my case, it was a beagleboard XM, a mobile broadband stick in a router and some custom embedded hardware rather than a Pi (the Pi didn't exist back when I built the system). Lets just say it's a world of pain. The first issue is that the nominal specs of batte...

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