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by dpawson
Fri Aug 16, 2019 3:26 pm
Forum: General discussion
Topic: Pi4 Cooling
Replies: 118
Views: 9907

Re: Pi4 Cooling

thanks, yes.

https://linuxhint.com/raspberry_pi_temperature_monitor/ pretties this up a bit.
by dpawson
Fri Aug 16, 2019 2:34 pm
Forum: General discussion
Topic: Pi4 Cooling
Replies: 118
Views: 9907

Re: Pi4 Cooling

A fully wired rpi 4 doesn't hang (other than from all the wires).
With Raspberry pi kbd as well, there's little room to hang it anywhere.

I settled on a fan and it's working.

Is there a command line (bash) tool I can use to monitor the temp please?
by dpawson
Mon Aug 12, 2019 5:39 pm
Forum: Troubleshooting
Topic: rpi 4 + sense hat, mechanical assembly
Replies: 3
Views: 102

Re: rpi 4 + sense hat, mechanical assembly

Yep, that worked.

https://flic.kr/s/aHsmG4HTF1

Once I'd got my head around the 180 shift :-)

Much neater.
by dpawson
Mon Aug 12, 2019 3:27 pm
Forum: Troubleshooting
Topic: rpi 4 + sense hat, mechanical assembly
Replies: 3
Views: 102

Re: rpi 4 + sense hat, mechanical assembly

Looking at your picture if you turned both plugs round the cable would come out on the outside, you could then dismantle one of the plugs and shorten the cable so as to reduce the spare cable left hanging out side the pi. the cable would then follow the path shown by the yellow line https://i.imgur...
by dpawson
Mon Aug 12, 2019 11:55 am
Forum: Troubleshooting
Topic: rpi 4 + sense hat, mechanical assembly
Replies: 3
Views: 102

rpi 4 + sense hat, mechanical assembly

Hearing of the heat issues I added a fan. 5V using usb. Which necessitated stand offs, and ribbon cable. Which meant a mounting system (styrene, 2mm). Result is not pretty. It runs cool and works. Ribbon is M-F, oddly the connectors don't fit in between the stand offs - pcb holes too tight (Eben?). ...
by dpawson
Sun Aug 11, 2019 12:11 pm
Forum: HATs and other add-ons
Topic: RPI 4 with sense hat
Replies: 3
Views: 968

Re: RPI 4 with sense hat

I have a sense hat mounted to an A+. I put a proto hat mounted on a stacking header between the Pi and sense hat and my temps then read normal. Close enough to normal ambient for me anyway. That pi sits upright with the GPIO header on the bottom to let the hot air escape easily. No case. I had some...
by dpawson
Fri Aug 09, 2019 2:17 pm
Forum: HATs and other add-ons
Topic: RPI 4 with sense hat
Replies: 3
Views: 968

RPI 4 with sense hat

I bought the RPI, liked the look of the sense hat and bought it, before finding about the heat issue. Last few days spent finding a way of cooling, with a hat 'mounted'. Parts on order. 1. Various stand off's, 2.5mm 2. NF-A4x10 5v 1" fan, driven from ob usb. 3. M-F 40w ribbon (rt angle fold to align...
by dpawson
Fri Aug 09, 2019 1:14 pm
Forum: Astro Pi
Topic: Best Ribbon Cable for Sense Hat?
Replies: 11
Views: 9174

Re: Best Ribbon Cable for Sense Hat?

https://www.dominicsayers.com/sense-hat/ Seems quite logical, unless you want the sense hat on top of the rpi - not good for an rpi 4. Purchased. Mounted RPI 4, fan (usb powered), sense hat. Ribbon 'stretches' the standoff posts, misaligns hat! https://drive.google.com/file/d/1A6KNR_sahRRIGlrrwUmJT...
by dpawson
Wed Aug 07, 2019 12:22 pm
Forum: General discussion
Topic: Pi4 Cooling
Replies: 118
Views: 9907

Re: Pi4 Cooling

The conflict info came from Pimoroni, so I guess I must accept it.
by dpawson
Wed Aug 07, 2019 11:57 am
Forum: General discussion
Topic: Pi4 Cooling
Replies: 118
Views: 9907

Re: Pi4 Cooling

There other cases on Aliexpress which show the fan wires connected between 5V and 3.3V GPIO pins too. I don't think that's a good idea. I guess whoever produced the images just plugged them in at random. Not nice - Is GPIO the only place we can tap 5v on the board? Imples @rpi only ever expected on...
by dpawson
Wed Aug 07, 2019 11:51 am
Forum: General discussion
Topic: Pi4 Cooling
Replies: 118
Views: 9907

Re: Pi4 Cooling

Is there a fan powered by a.n.other means than GPIO? One of the many aluminium cases on Aliexpress shows fan wires connected to the POE header pins. Presumably two of these pins are connected to 5V and Ground. No idea which, or if you can really power a fan from them though. https://www.aliexpress....
by dpawson
Wed Aug 07, 2019 11:47 am
Forum: General discussion
Topic: Pi4 Cooling
Replies: 118
Views: 9907

Re: Pi4 Cooling, fan not powered from GPIO?

Fanshim looks pretty neat. Are the GPIO pins still usable 'above' the n pins used by the fan please? A bit cockeyed, but still usable? It depends on what you mean by "usable". They're certainly accessible - the shim is very thin and is not soldered. You could connect to the pins with a 40-way ribbo...
by dpawson
Tue Aug 06, 2019 2:51 pm
Forum: General discussion
Topic: Pi4 Cooling
Replies: 118
Views: 9907

Re: Pi4 Cooling, fan not powered from GPIO?

Fanshim looks pretty neat. Are the GPIO pins still usable 'above' the n pins used by the fan please?
A bit cockeyed, but still usable?

Is there a fan powered by a.n.other means than GPIO?
by dpawson
Mon Aug 05, 2019 6:37 pm
Forum: General discussion
Topic: Pi4 Cooling
Replies: 118
Views: 9907

Re: Pi4 Cooling

Fan SHIM our favourite pirates are selling makes temperature under control at all times. After installing it I haven't seen it going over 49ºC at any point. And - it is solderless installation - so no need to 'dedicate' PI to run with that particular shim. Alternative (from my perspective) is what ...
by dpawson
Mon Jun 11, 2012 2:53 pm
Forum: Advanced users
Topic: recursion... in asm?
Replies: 2
Views: 1882

recursion... in asm?

Tail recursion, in assembler?
E.g. given...

Code: Select all

def mymod(n):
    if (n < 10):
               return n
    return mymod(n - 10)
What might the asm look like?

Any pecularities or is is straightforward?
Not something I'd thought of before.
TIA
by dpawson
Mon Jun 11, 2012 11:21 am
Forum: Advanced users
Topic: asm printf?
Replies: 40
Views: 6009

Re: asm printf?

Thanks rurwin.

input:
space 96,0

ldr r1,=input
mov r2, #96
mov r0, 0
mov r7, #3
svc #0

ldr r1, =input
mov r2, r0
bl print @ subr to print

Works nicely.

Dave
by dpawson
Mon Jun 11, 2012 9:50 am
Forum: Advanced users
Topic: asm printf?
Replies: 40
Views: 6009

Re: asm printf?

Taking this a little further. http://asm.sourceforge.net/syscall.html shows the kernel etc calls, which relate cleanly to the definitions at http://lxr.free-electrons.com/source/arch/arm/include/asm/unistd.h?v=3.1;a=arm E.g 3. sys_read Syntax: ssize_t sys_read(unsigned int fd, char * buf, size_t cou...
by dpawson
Sat Jun 09, 2012 8:41 am
Forum: Advanced users
Topic: Where to report bugs?
Replies: 1
Views: 1357

Re: Where to report bugs?

GIYF

Report bugs at

http://sourceware.org/bugzilla/

Sorry to waste bw.

DaveP
by dpawson
Sat Jun 09, 2012 8:34 am
Forum: Advanced users
Topic: Where to report bugs?
Replies: 1
Views: 1357

Where to report bugs?

Just running gas and an error came up

Internal error:
Assertion failure in make_mapping_symbol at ../../gas/config/tc-arm.c line 2485
Please report this bug
the line in question is
.bss right at the end of the program

.... Then no uri where I can report it?

Any suggestions pls?
by dpawson
Thu Jun 07, 2012 1:55 pm
Forum: Troubleshooting
Topic: OK LED off most of the time following rpi-update
Replies: 20
Views: 3651

Re: OK LED off most of the time following rpi-update

rurwin wrote:http://www.raspberrypi.org/phpBB3/viewt ... =26&t=6857

Summary: Don't do an RPiUpdate at the moment; it seems to be broken.
Worked an hour ago?

Dave
by dpawson
Thu Jun 07, 2012 1:23 pm
Forum: Troubleshooting
Topic: OK LED off most of the time following rpi-update
Replies: 20
Views: 3651

Re: OK LED off most of the time following rpi-update

texy wrote:
Last night the ca-certificate failed to download (or be found, one or t'other). Is this resolved now?

Texy
No problem today.


Dave
by dpawson
Thu Jun 07, 2012 11:09 am
Forum: Troubleshooting
Topic: OK LED off most of the time following rpi-update
Replies: 20
Views: 3651

Re: OK LED off most of the time following rpi-update

Having run it I get
Using SoftFP libraries
/opt/vc/sbin/vcfiled: error while loading shared libraries: libvchiq_arm.so: cannot open shared object file: No such file or directory?

Suggestions please?
by dpawson
Thu Jun 07, 2012 11:03 am
Forum: Troubleshooting
Topic: OK LED off most of the time following rpi-update
Replies: 20
Views: 3651

Re: OK LED off most of the time following rpi-update

NickT wrote:
dpawson wrote:Someone tell what rpi-update is please?

Dave
It's way of keeping your Pi up to date with the very latest firmware/kernel patches. Best explained here

https://github.com/Hexxeh/rpi-update
Needs ca-certificates and git-core too!

Thanks.
by dpawson
Thu Jun 07, 2012 10:36 am
Forum: Troubleshooting
Topic: OK LED off most of the time following rpi-update
Replies: 20
Views: 3651

Re: OK LED off most of the time following rpi-update

Someone tell what rpi-update is please?

Dave

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