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by gtoal
Sun Jun 23, 2019 7:56 pm
Forum: Networking and servers
Topic: rpi2 with 3 ethernet
Replies: 3
Views: 739

Re: rpi2 with 3 ethernet

USB nics are not an option Is the reason for that because you've tried some and they're completely unreliable, causing repeated crashes of your pi? If so, I had the same problem with those cheap chinese USB-hub+nic units. But I eventually found a couple of USB ether devices that *are* reliable and ...
by gtoal
Sun Jun 23, 2019 7:49 pm
Forum: Networking and servers
Topic: Is there a ready-made vpn solution for Raspi to be accessible via non-public IP ?
Replies: 5
Views: 551

Re: Is there a ready-made vpn solution for Raspi to be accessible via non-public IP ?

1. is when I put Raspberry in the LAN only as a tool to access the whole LAN (so I don't need Raspberry there, but I need access to the LAN as when I will be connected to it directly), when public IP is not available, I'm still looking for final solution for this Have you considered OpenVPN? https:...
by gtoal
Sun Jun 16, 2019 10:08 pm
Forum: Troubleshooting
Topic: A B+ that always boots into recovery mode!
Replies: 5
Views: 284

Re: A B+ that always boots into recovery mode!

Sorry - I just now realised I forgot to post to say that your advice worked and I can boot that machine now. Despite using my best PSU on it, I think the problems I've seen including this boot one were power related - perhaps there's an internal short that is sucking some of the available power and ...
by gtoal
Thu Jun 13, 2019 3:59 pm
Forum: Networking and servers
Topic: How to access existing local wlan subnet on pi router?
Replies: 4
Views: 204

Re: How to access existing local wlan subnet on pi router?

Thanks! Option #2 worked, I'm able to route through to the private subnet. (It's actually a little more complicated than I hoped - I forgot that the *WAN* address of the proprietary wifi was also on the 192.168.1 subnet so the wifi unit will not advertise the static route via my client IP to that sa...
by gtoal
Thu Jun 13, 2019 9:33 am
Forum: Networking and servers
Topic: How to access existing local wlan subnet on pi router?
Replies: 4
Views: 204

Re: How to access existing local wlan subnet on pi router?

(1) isn't an option with the specific AP in question. (3) is something I'ld rather avoid for reasons already given. (2) might work... I will give it a try and see if there are no unforseen problems.

Thanks. Still open to suggestions if anyone has any alternative methods.

G
by gtoal
Thu Jun 13, 2019 4:57 am
Forum: Networking and servers
Topic: Installing OpenVPN on a Pi
Replies: 3
Views: 489

Re: Installing OpenVPN on a Pi

Thanks! I'ld managed to set up an OpenVPN server on a remote intel-based debian following the instructions in https://www.digitalocean.com/community/tutorials/how-to-set-up-an-openvpn-server-on-ubuntu-16-04 but I've been a bit wary of translating them to the Pi world! Appreciate your write-up and th...
by gtoal
Thu Jun 13, 2019 4:50 am
Forum: Networking and servers
Topic: Is there a ready-made vpn solution for Raspi to be accessible via non-public IP ?
Replies: 5
Views: 551

Re: Is there a ready-made vpn solution for Raspi to be accessible via non-public IP ?

It's not a VPN as such, but if both caller and callee are behind gateways, you can call from one to the other using ssh forwarding, if you have a third host somewhere else with a public IP. on callee: export AUTOSSH_GATETIME=0 autossh -f -N -p 443 -R 10001:localhost:22 myacct@publichost -oLogLevel=e...
by gtoal
Thu Jun 13, 2019 4:33 am
Forum: Networking and servers
Topic: How to access existing local wlan subnet on pi router?
Replies: 4
Views: 204

How to access existing local wlan subnet on pi router?

I also have several pies on my in-house network, acting as bridging wireless access points. (different SSIDs but they all bridge to the same 192.168.1 subnet, and that works great.) The majority of machines in my house (about 80 of them) connect via these pi-based access points. Now for obscure reas...
by gtoal
Sun Jun 02, 2019 9:44 pm
Forum: Troubleshooting
Topic: A B+ that always boots into recovery mode!
Replies: 5
Views: 284

Re: A B+ that always boots into recovery mode!

OK, I've read the boot sticky. It doesn't explain this behaviour. The machine does boot, just not into the right partition, eliminating things like dead 5v or 3.3v supply. There is adequate power, and the SDs I'm testing with are all very recent noobs V3.0.1 - some unconfigured, some booting up to l...
by gtoal
Sun Jun 02, 2019 8:47 pm
Forum: Automation, sensing and robotics
Topic: Stereo camera with CM3 inside for OpenCV learners, drones and robotics
Replies: 29
Views: 8945

Re: Stereo camera with CM3 inside for OpenCV learners, drones and robotics

Two comments from me. 1) I jumped on this as soon as I saw it because I'm a stereo photographer from way back and thought this was going to be hardware-synchronised frame grabbing, especially for video - I was a little disappointed when I read that the cameras are shot sequentially with a 1ms delay...
by gtoal
Sun Jun 02, 2019 7:35 pm
Forum: Troubleshooting
Topic: A B+ that always boots into recovery mode!
Replies: 5
Views: 284

A B+ that always boots into recovery mode!

I recently bought a couple of old single-core B+ units on ebay. One of them is weird - it always boots into the recovery partition (directly from the rainbow screen, not via the 'press shift' screen). It is the Pi itself that is causing this behaviour,, not the contents of the SD card - same thing h...
by gtoal
Sat Feb 23, 2019 3:17 am
Forum: Automation, sensing and robotics
Topic: Stereo camera with CM3 inside for OpenCV learners, drones and robotics
Replies: 29
Views: 8945

Re: Stereo camera with CM3 inside for OpenCV learners, drones and robotics

Two comments from me. 1) I jumped on this as soon as I saw it because I'm a stereo photographer from way back and thought this was going to be hardware-synchronised frame grabbing, especially for video - I was a little disappointed when I read that the cameras are shot sequentially with a 1ms delay ...
by gtoal
Fri Jul 13, 2018 3:09 am
Forum: C/C++
Topic: How to get most precise timer or sleep function on Raspberry
Replies: 13
Views: 9241

Re: How to get most precise timer or sleep function on Raspberry

given the recent announcement of the RT kernel branch ( https://www.raspberrypi.org/forums/viewtopic.php?f=117&t=206747 ), the answers here might need to be updated, for instance the use of nanosleep rather than usleep See https://www.raspberrypi.org/forums/viewtopic.php?p=384910 https://elinux.org/...
by gtoal
Thu Jun 28, 2018 10:01 pm
Forum: HATs and other add-ons
Topic: How to sense a 5v input with GPIO
Replies: 18
Views: 48641

Re: How to sense a 5v input with GPIO

pcmanbob wrote:
Tue Jun 26, 2018 10:54 am
You can calculate the current flowing through the resistors by simply using ohm's law were current = voltage / resistance , I =V/R
Groan! The embarrassment of realising that E=IR was the only factor involved :-/
by gtoal
Tue Jun 26, 2018 1:40 am
Forum: HATs and other add-ons
Topic: How to sense a 5v input with GPIO
Replies: 18
Views: 48641

Re: How to sense a 5v input with GPIO

I have a very similar problem but the issue I want to check with you is how much current is dissipated across the resistors - I have a system that is powered by the 5V bus of a Vectrex computer. Attached to the Vectrex is a smart cartridge (ARM powered but not pi-related) which is powered by the Vec...
by gtoal
Thu Apr 12, 2018 10:46 pm
Forum: Bare metal, Assembly language
Topic: Is there a bare metal arduino-like environment?
Replies: 1
Views: 586

Is there a bare metal arduino-like environment?

I know there is a system available to compile and run arduino-like sketches on the Pi under Raspbian, but is it possible to run similar sketches on the Pi without a multitasking O/S, just the sketch and some boot code and appropriate arduino-like libraries pre-linked? (Just asking out of interest, d...
by gtoal
Sun Feb 25, 2018 11:04 pm
Forum: Camera board
Topic: Alternatives or replacements for camera flex cable?
Replies: 149
Views: 134104

Re: Alternatives or replacements for camera flex cable?

If US -> DE shipping is too expensive, how about these? - https://www.ebay.com/itm/15Pin-to-15Pin-ZIF-1-0mm-Pitch-FFC-Cable-Extension-Connector-Adapter-Brand-New-/122454866623 and similar - is shipping from China to Europe usually free like it is from China to USA? (courtesy of the Universal Postal ...
by gtoal
Fri Feb 23, 2018 7:14 pm
Forum: Camera board
Topic: Alternatives or replacements for camera flex cable?
Replies: 149
Views: 134104

Re: Alternatives or replacements for camera flex cable?

There are a few of these extender boards around - for example, https://www.adafruit.com/product/3671
by gtoal
Thu Feb 08, 2018 5:53 pm
Forum: General programming discussion
Topic: British-made programming language
Replies: 54
Views: 13363

Re: British-made programming language

Paul Webster, Wow, it's a long time since I heard anything from a former Coral-66 programmer. I did a couple of years of Coral 66 back in the early 1980's. For Marconi Radar. Yes, Coral was similar enough to Algol to be picked up quickly. I had never heard of it before starting at Marconi Radar. Th...
by gtoal
Tue Feb 06, 2018 7:43 pm
Forum: General programming discussion
Topic: British-made programming language
Replies: 54
Views: 13363

Re: British-made programming language

Well, I was reading through this thread and thinking I'ld like to add some info, but had decided not to when I saw the 2012 date - but since some brave soul has already resurrected it... here goes... You've got the main ones. Pleased to see that Gordon mentioned Imp - though to clarify the primary l...
by gtoal
Mon Sep 11, 2017 7:48 am
Forum: General discussion
Topic: Be careful with Pi Zero and CSI slot
Replies: 39
Views: 10612

Re: Be careful with Pi Zero and CSI slot

I now have broken CSI clamps on 3 of 6 pi zeros. After the first one I was extra careful but it still happened. I consider it a design flaw. I've used extremely sticky tape to hold one in place over the broken connector but the depth of insertion is so shallow that even a little amount of give to th...
by gtoal
Sun Aug 06, 2017 11:37 pm
Forum: General discussion
Topic: keeping the temp low without fans?
Replies: 14
Views: 2503

Re: keeping the temp low without fans?

OutoftheBOTS wrote:
Sun Aug 06, 2017 9:42 pm
cut a little hole in the hat for a heat sink to stick out. The bottom line is that you have the let the heat escape so that it doesn't build up
I think I've solved the fan problem :-) (That probably *would* pass as normal in this part of the world :-/ )
by gtoal
Sun Aug 06, 2017 11:33 pm
Forum: General discussion
Topic: keeping the temp low without fans?
Replies: 14
Views: 2503

Re: keeping the temp low without fans?

How are you protecting the Pi from ESD? I just lost a new Pi0W to static (as far as the forum can conclude) Interesting, had not seen those threads. I just bought my second Pi Zero W a week or so back, and after working once, the wifi stopped working permanently. I didn't handle it roughly at all b...
by gtoal
Sun Aug 06, 2017 9:33 pm
Forum: General discussion
Topic: keeping the temp low without fans?
Replies: 14
Views: 2503

Re: keeping the temp low without fans?

Thanks for all your comments and suggestions. I'll look into seeing if it's possible to turn off the speed governor as suggested and lock it down at the lowest speed, and see how much difference that makes. Heatsinks etc aren't a option - there is literally no room for *anything* extra, and sticking...
by gtoal
Sun Aug 06, 2017 5:51 am
Forum: General discussion
Topic: keeping the temp low without fans?
Replies: 14
Views: 2503

keeping the temp low without fans?

I've just built a hat for a pi zero w. No, I don't mean an add-on card, I mean the thing you stick on your head :-) It contains a hidden picam that want to continuously record my day with, plus do anything else I might want an on-head personal assistant to do :-) The trouble is, the pi is right next...

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