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by Pete6
Sat May 02, 2020 5:47 pm
Forum: Beginners
Topic: Accessing lighttpd web pages via usb port
Replies: 2
Views: 67

Re: Accessing lighttpd web pages via usb port

Thank you. I shall try the solution. Speed is not so much a problem but I will see what testing brings.

Thanks again.
by Pete6
Sat May 02, 2020 4:58 pm
Forum: Beginners
Topic: Accessing lighttpd web pages via usb port
Replies: 2
Views: 67

Accessing lighttpd web pages via usb port

I have a Pi 4 with some lighttpd web pages. The site works very well from Windows 10 Chrome or from my phone via my WiFi LAN.

Since the Pi uses USB for power I was wondering if it was possible to access these same web pages via the USB port. How would I do this please?
by Pete6
Sat Apr 11, 2020 9:17 pm
Forum: Beginners
Topic: GPU/CPU temperature limit for RPI3
Replies: 27
Views: 7145

Re: GPU/CPU temperature limit for RPI3

That was a good guess and nearly right. Over the decades I have learnt that the more attention I pay to power the better my project turns out. This was the case with valve amplifiers in the 1960s and it is still true today. I have my Pi connected to a wired Ethernet and since it is a Pi 3 it only us...
by Pete6
Fri Apr 10, 2020 8:53 pm
Forum: Beginners
Topic: GPU/CPU temperature limit for RPI3
Replies: 27
Views: 7145

Re: GPU/CPU temperature limit for RPI3

It (whatever it happens to be) failed again today. The camera keeps taking images, one every two minutes, the PI keeps on concatenating them into a contiguous video and the filename timestamps are consistent with two minute intervals. Therefore the processor has not stopped. It seems, as yesterday, ...
by Pete6
Thu Apr 09, 2020 9:10 pm
Forum: Beginners
Topic: GPU/CPU temperature limit for RPI3
Replies: 27
Views: 7145

Re: GPU/CPU temperature limit for RPI3

No, I am not overclocking. This is odd. What failed externally was that I could not get to the lightppd webpage on my LAN. I could also not get the the login prompt via SSH. I cannot use the console since it is mounted on the roof. The software collects an image every 2 minutes and these are concate...
by Pete6
Thu Apr 09, 2020 8:26 pm
Forum: Beginners
Topic: GPU/CPU temperature limit for RPI3
Replies: 27
Views: 7145

Re: GPU/CPU temperature limit for RPI3

I bought the device indoors and left it for half an hour, plugged it in and... it came straight back up. I have not opened the case. Just gave it power and away it went. I have no idea what stopped. All I know is that I now have a problem with my project. I currently have a single box design. It may...
by Pete6
Thu Apr 09, 2020 6:44 pm
Forum: Beginners
Topic: GPU/CPU temperature limit for RPI3
Replies: 27
Views: 7145

Re: GPU/CPU temperature limit for RPI3

It just fell over and a power cycle does not bring the login: prompt back up in SSH and I cannot get to the web page. CPU Temp hit 87C just before failure. I have a 2nd device running on the North side of my house and that is happily running at CPU temp of 51C. I need to bring it down from the gutte...
by Pete6
Thu Apr 09, 2020 5:05 pm
Forum: Beginners
Topic: GPU/CPU temperature limit for RPI3
Replies: 27
Views: 7145

Re: GPU/CPU temperature limit for RPI3

Yes, that might work. It may be soon time to try these measures. I saved this single frame just now https://photos.app.goo.gl/HLesJCfncCeHKHrx5 As you can see the CPU temperature just hit 86C. It is still working. In two months time I expect the outdoor temperature to rise by a further 6-7C so the P...
by Pete6
Tue Mar 24, 2020 1:42 pm
Forum: Beginners
Topic: Getting the maximum out of the raspi-cam 2 in NOIR darkness
Replies: 5
Views: 280

Re: Getting the maximum out of the raspi-cam 2 in NOIR darkness

Thank you very much for that excellent and complete explanation. I shall try my best to use raspistill arguments that allow as much automatic control as possible. I am still very much feeling my way with this little project although I now have a feeling that I can see how it will look in the end. On...
by Pete6
Tue Mar 24, 2020 12:42 am
Forum: Beginners
Topic: Getting the maximum out of the raspi-cam 2 in NOIR darkness
Replies: 5
Views: 280

Re: Getting the maximum out of the raspi-cam 2 in NOIR darkness

This now works. Thank you for your help. raspistill -ISO auto -hf -awb greyworld -ex night -ss 10000000 -w 800 -h 600 -tl 120000 -t 2147483647 -n -o pic.jpg The main problem was that I had and still do not have access to the HDMI port. It's on the roof. This meant the only way I had to test was the ...
by Pete6
Mon Mar 23, 2020 3:29 pm
Forum: Beginners
Topic: Getting the maximum out of the raspi-cam 2 in NOIR darkness
Replies: 5
Views: 280

Re: Getting the maximum out of the raspi-cam 2 in NOIR darkness

Thank for your reply. I have done what you suggested with the arguments. Now I'll wait for night and see what happens. This is iterative. Make changes, look at results. Repeat. The raspi-cam sensor is quite good but there are obvious limits. My telescope astronomy camera cost over 2000 quid so it is...
by Pete6
Mon Mar 23, 2020 2:04 pm
Forum: Beginners
Topic: GPU/CPU temperature limit for RPI3
Replies: 27
Views: 7145

Re: GPU/CPU temperature limit for RPI3

1. There are no batteries. 2. I can live with a slowdown as it is only during the day. 3. Neither heatsink or fan has much effect in a closed environment. That was why I originally asked the question. I may consider a Peltier cell on the outside of the case as it is metal. The problem is that they n...
by Pete6
Mon Mar 23, 2020 3:35 am
Forum: Beginners
Topic: Getting the maximum out of the raspi-cam 2 in NOIR darkness
Replies: 5
Views: 280

Getting the maximum out of the raspi-cam 2 in NOIR darkness

I'm an amateur astronomer. I am using a raspi-cam2 (IMX219 sensor) to take images of the night sky once a minute via a NOIR lens. raspistill is used to take an image once a minute. I am looking to get the maximum out of the camera. Here are my settings Twilight="-ISO 600 -hf -awb greyworld -n -ex au...
by Pete6
Mon Mar 23, 2020 3:27 am
Forum: Beginners
Topic: GPU/CPU temperature limit for RPI3
Replies: 27
Views: 7145

Re: GPU/CPU temperature limit for RPI3

It has a heatsink. I really do not want to put a fan in the box for a few reasons: - the box is currently weatherproof i.e. no internal/external air path for ventillation. - If the fan fails then I am back where I am now. - the outside air is often slightly greater than 40C. I know that is not 85C b...
by Pete6
Fri Mar 20, 2020 7:43 pm
Forum: Beginners
Topic: GPU/CPU temperature limit for RPI3
Replies: 27
Views: 7145

Re: GPU/CPU temperature limit for RPI3

That was pretty much what I had thought but I wished to be sure. Thanks.

I shall ultimately put this whole thing on top of a 25M radio mast which is about 45 miles from my house so maintenance will not be that easy.
by Pete6
Fri Mar 20, 2020 6:44 pm
Forum: Beginners
Topic: GPU/CPU temperature limit for RPI3
Replies: 27
Views: 7145

Re: GPU/CPU temperature limit for RPI3

What happens to my running programs and tasks when the CPU exceeds its temperature limit? This is about as concise as I can word what I'm asking. Put another way. If the CPU temp exceeds its limits by maybe 10C , so 95C will the Pi just stop, slowdown, what? Once the temperature has cooled off a bit...
by Pete6
Fri Mar 20, 2020 5:47 pm
Forum: Beginners
Topic: GPU/CPU temperature limit for RPI3
Replies: 27
Views: 7145

Re: GPU/CPU temperature limit for RPI3

At risk of getting hammered for resurrecting this thread, I have a Pi 3B running an astronomy AllSky camera. The Pi is mounted inside a re-purposed dome security camera case. The whole thing is mounted on the gutter of my sun room which faces south. I have a DS18B20 sticking up into the sunlight 'cu...
by Pete6
Sun Mar 15, 2020 5:37 pm
Forum: Beginners
Topic: Bash subscripted variable output from for do done loop
Replies: 13
Views: 582

Re: Bash subscripted variable output from for do done loop

@scruss, I have started playing with at . It was not on my Pi so I installed it. I seems to be a different approach to what I am doing now but that is not a problem. I think I shall be able to dispense with running a service job and just have at run stuff for me from a file. It is going to take me a...
by Pete6
Fri Mar 13, 2020 2:23 am
Forum: Beginners
Topic: Bash subscripted variable output from for do done loop
Replies: 13
Views: 582

Re: Bash subscripted variable output from for do done loop

You may be right. I am reluctant to change right now as I am very much a beginner with Linux. I need to learn enough to ask questions if you see what I mean. Here's my cron file that is generated by my shell script named webcam. This is regenerated by the script file every time the webcam file is ru...
by Pete6
Fri Mar 13, 2020 1:39 am
Forum: Beginners
Topic: Bash subscripted variable output from for do done loop
Replies: 13
Views: 582

Re: Bash subscripted variable output from for do done loop

You are probably be right about the for loop not being a sub-shell. I do not know enough about Linux or Bash to know. I appreciate the alternative solution. Right now my project is working fine. Well almost. I have a cronjob error that I do not understand. cron[372]: (*system*webcam) ERROR (Syntax e...
by Pete6
Thu Mar 12, 2020 4:39 pm
Forum: Beginners
Topic: Bash subscripted variable output from for do done loop
Replies: 13
Views: 582

Re: Bash subscripted variable output from for do done loop

During my searches I came across this little gem. https://manpages.debian.org/jessie/cron/cron.8.en.html An extract shows this: As described above, the files under these directories have to be pass some sanity checks including the following: be executable, be owned by root, not be writable by group ...
by Pete6
Thu Mar 12, 2020 1:57 pm
Forum: Beginners
Topic: Bash subscripted variable output from for do done loop
Replies: 13
Views: 582

Re: Bash subscripted variable output from for do done loop

THAT is fantastic. It is very elegant a exactly what I need. It helps that it also works perfectly .Thank you. I did some (well, a lot) Googling and it seems that certainly piping "|" and most likely for loops start a sub-shell to work within and variables within the sub-shell are thrown away when t...
by Pete6
Wed Mar 11, 2020 10:59 pm
Forum: Beginners
Topic: Bash subscripted variable output from for do done loop
Replies: 13
Views: 582

Re: Bash subscripted variable output from for do done loop

Thanks for your reply. Actually all I need is to know how to have the variables from my for do loop be accessible. Here is my entire file and it works well apart from this one tiny part that I do not know how to do - yet. If anybody can just answer my question and give me usable variables out of my ...
by Pete6
Wed Mar 11, 2020 10:56 pm
Forum: Beginners
Topic: Bash subscripted variable output from for do done loop
Replies: 13
Views: 582

Re: Bash subscripted variable output from for do done loop

If you'd like to take a peek at the project working, go to this url http://75.10.164.105:8082/index.php
by Pete6
Wed Mar 11, 2020 8:45 pm
Forum: Beginners
Topic: Bash subscripted variable output from for do done loop
Replies: 13
Views: 582

Re: Bash subscripted variable output from for do done loop

Thanks but not quite what I need. Maybe I do not understand what you did. What I'd like to have are variables that I can use inside the same bash script. The input number may vary from 00 - 59 minutes so I could have any numbers from 1 to 5 or 10 to 50 as an output. I am writing a script that writes...

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