Go to advanced search

by Bellisarius
Thu Dec 01, 2016 11:20 am
Forum: General discussion
Topic: Strip Chart
Replies: 0
Views: 402

Strip Chart

For a Seismograph project, and other projects, I would really like to have a strip chart control. I'm not really bothered what language it's implemented in, as I want to box it up so it can just receive telegrams with new values from the kids code. Although there are many strip chart controls for SD...
by Bellisarius
Sat Aug 20, 2016 4:35 pm
Forum: Raspberry Pi OS
Topic: sd card corrupts/is unable to boot RPi often
Replies: 2
Views: 712

Re: sd card corrupts/is unable to boot RPi often

It is possible that the phone is drawing current from the USB port and this is overloading your PI supply leading to dropouts that cause flash corruption.

Do you have a little rainbow square in the corner of the screen?
by Bellisarius
Sat Aug 20, 2016 8:20 am
Forum: Raspberry Pi OS
Topic: raspberry pi will not reboot
Replies: 2
Views: 1002

Re: raspberry pi will not reboot

I don't think it's a software issue as it does reach the shutdown point. PSU and reset cct's in the RPI are poor, the problem may be electrical. What is that little message that flashes in the middle of the monitor just before it goes down?
by Bellisarius
Sat Aug 20, 2016 7:39 am
Forum: Raspberry Pi OS
Topic: I can't use apt-get cause I've have held broken package
Replies: 28
Views: 7206

Re: I can't use apt-get cause I've have held broken package

BTW, if you do get it working, make a snapshot of your SD card ;-)
by Bellisarius
Sat Aug 20, 2016 7:36 am
Forum: Raspberry Pi OS
Topic: I can't use apt-get cause I've have held broken package
Replies: 28
Views: 7206

Re: I can't use apt-get cause I've have held broken package

Next command I would run is

sudo apt-get check
by Bellisarius
Sat Aug 20, 2016 12:07 am
Forum: Raspberry Pi OS
Topic: Stuck on rainbow screen, sd card has become write-protected
Replies: 4
Views: 1000

Re: Stuck on rainbow screen, sd card has become write-protec

It does if you stick it back in the PC to try rewriting it......
by Bellisarius
Sat Aug 20, 2016 12:05 am
Forum: Raspberry Pi OS
Topic: Auto Start Firefox-Esr on Boot
Replies: 6
Views: 16328

Re: Auto Start Firefox-Esr on Boot

As Firefox requires X windows, your best option could be to set the Pi up for auto login to the X desktop (default on current Raspian distros), and then launch it from the window manager configuration file: ~/.config/lxsession/LXDE/autostart (You may need to create it) Just add the program name to t...
by Bellisarius
Fri Aug 19, 2016 11:44 pm
Forum: Raspberry Pi OS
Topic: Stuck on rainbow screen, sd card has become write-protected
Replies: 4
Views: 1000

Re: Stuck on rainbow screen, sd card has become write-protec

I would expect the Kernel to get beyond the rainbow even if the SD card was ready only. You do mean a fullscreen rainbow and not just a little rainbow in the corner? If it does not get beyond that screen then the RPI is not able to boot from the SD card. How did you format and prepare the card? Why ...
by Bellisarius
Fri Aug 19, 2016 8:50 pm
Forum: Raspberry Pi OS
Topic: IEP - Python editor
Replies: 0
Views: 440

IEP - Python editor

I've been trying out various Python development environments on Raspbian, and I've found IEP to be head and shoulders above the alternatives. It's not particularly fast, but on the latest Pi's it's quite usable. Given the important role Python has in the RPI ecosphere, I couldn't help wondering whet...
by Bellisarius
Fri Mar 25, 2016 2:00 am
Forum: General discussion
Topic: Zero Vs Compute module
Replies: 7
Views: 2458

Re: Zero Vs Compute module

Thanks, I wasn't aware that a new CM was on the way; I guess I should also take into account the spec of that as well....is it available anywhere?
by Bellisarius
Fri Mar 25, 2016 1:42 am
Forum: Advanced users
Topic: Booting non-linux kernels
Replies: 2
Views: 757

Re: Booting non-linux kernels

I'm no expert on this, but in the second example who is actually shifting the data from the mmc to memory?
by Bellisarius
Fri Mar 25, 2016 1:33 am
Forum: Advanced users
Topic: php and mysql failing
Replies: 20
Views: 3902

Re: php and mysql failing

What about trying to print other attributes of $conn before calling query?
by Bellisarius
Fri Mar 25, 2016 1:26 am
Forum: Beginners
Topic: sending data from raspberry
Replies: 6
Views: 1368

Re: sending data from raspberry

Use trained homing-pigeon/parrot crossbreeds to memorise and deliver the data. A speech-to-text engine will be able to convert the data back to enable it to be posted on your django. RFC 1149 describes a far more efficient way of using Avian carriers, and it has been successfully implemented and te...
by Bellisarius
Fri Mar 25, 2016 1:23 am
Forum: Beginners
Topic: sending data from raspberry
Replies: 6
Views: 1368

Re: sending data from raspberry

sfe2me wrote:I have a temperature sensor I want to send the data to an html file in a django project
First thing to is to tell people where the django project is being hosted. On the same Pi, on another computer on the local network, or on a remote webserver.
by Bellisarius
Fri Mar 25, 2016 1:17 am
Forum: General discussion
Topic: 2 speakers
Replies: 3
Views: 691

Re: 2 speakers

You can add USB sound adapaters for as many outputs as you want.

Pi has a stereo output on the board, but hdmi monitors often have audio outputs which come form the hdmi channel. I'm not sure if the mixer allows concurrent use of both outputs on the Pi.
by Bellisarius
Fri Mar 25, 2016 1:11 am
Forum: General discussion
Topic: Controller with a touchscreen
Replies: 1
Views: 931

Re: Controller with a touchscreen

First thing to remeber about touchscreens is they are fiddly, so you will want to keep pots and buttons. Touch screen is good for doing screens of modes or hotkeys put not for altering values. I do industrial control panels and put numeric keypads along side the touchscreens for numeric input. When ...
by Bellisarius
Fri Mar 25, 2016 12:51 am
Forum: General discussion
Topic: Zero Vs Compute module
Replies: 7
Views: 2458

Re: Zero Vs Compute module

[quote="asandford"]Been answered many times already. I'm sorry, I've spent 2 hours reading about supply and availability and the situation is clear, but what is not clear whether this will eventually become a regular product distributed by RS Farnell etc, or whether it's only intended to b...
by Bellisarius
Fri Mar 25, 2016 12:23 am
Forum: General discussion
Topic: Zero Vs Compute module
Replies: 7
Views: 2458

Zero Vs Compute module

The compute module is designed to be embedded onto another board, but the Pi Zero can also be easily mounted onto another board and from my viewpoint has a number of advantages. One great feature of the Pi is you make copies of known working SD card snapshots and just slot them in and out, which is ...
by Bellisarius
Thu Feb 25, 2016 6:52 pm
Forum: Troubleshooting
Topic: Pi B+ USB PSU cct
Replies: 20
Views: 2546

Re: Pi B+ USB PSU cct

Ah. OK. I was under the impression that you thought it was missing from yours and not from others. I love to tinker as much as the next man, but I'd have sent it back under warranty as it's brand new if it were mine, rather than voiding the warranty by solder bits to it. Each to their own. Good luc...
by Bellisarius
Thu Feb 25, 2016 6:15 pm
Forum: Troubleshooting
Topic: Pi B+ USB PSU cct
Replies: 20
Views: 2546

Re: Pi B+ USB PSU cct

In that case, every single close-up photograph found via Google Images clearly showing R40 to be missing on the B+ must be of non-functioning boards then, so I defer to your wisdom. I know they don't normally have them, I've got other Pi B+'s myself. I was curious, and seeing as how it's supposed t...
by Bellisarius
Thu Feb 25, 2016 5:31 pm
Forum: Troubleshooting
Topic: Pi B+ USB PSU cct
Replies: 20
Views: 2546

Re: Pi B+ USB PSU cct

That's because it's not meant to be there. The datasheet is quite categoric, Test3 is only for factory testing and MUST be tied to VDD33IO for normal operation. This is what linking R40 does. Have you followed any of the advice given so far? I haven't actually been given much advice. As I noted in ...
by Bellisarius
Wed Feb 24, 2016 10:23 pm
Forum: Troubleshooting
Topic: Pi B+ USB PSU cct
Replies: 20
Views: 2546

Re: Pi B+ USB PSU cct

I have now established that we are missing the enable signal from the LAN9514 If I wire this up by hand the USB is enabled, but not working. Clearly there is something wrong in the LSI. I noticed that R40 was missing. Without this TEST3 pin is not pulled up to the adjacent VDD33IO, which it should b...
by Bellisarius
Wed Feb 24, 2016 8:40 pm
Forum: Troubleshooting
Topic: Pi B+ USB PSU cct
Replies: 20
Views: 2546

Re: Pi B+ USB PSU cct

Mind you, I could always hack the SD card in another Pi to give me the status of the LSI on the video without login....if the info is available.
by Bellisarius
Wed Feb 24, 2016 8:38 pm
Forum: Troubleshooting
Topic: Pi B+ USB PSU cct
Replies: 20
Views: 2546

Re: Pi B+ USB PSU cct

That makes it a bit clearer...but it looks like there's no way to tell between a fault condition and the device being forced off by the LSI unless we cut a track.

It's not that there's any sware indication in the boot mesg if there's that fault condition?
by Bellisarius
Wed Feb 24, 2016 7:18 pm
Forum: Troubleshooting
Topic: Pi B+ USB PSU cct
Replies: 20
Views: 2546

Re: Pi B+ USB PSU cct

The enable to U13 is low

Go to advanced search