Go to advanced search

by liudr
Wed Jun 13, 2018 3:41 am
Forum: General discussion
Topic: Black screen with cursor (basic openbox?)
Replies: 4
Views: 149

Re: Black screen with cursor (basic openbox?)

I would not use Windows on any device with Unix/Linux file system since Windows does not recognize the Unix/Linux file system unless some special programs are added to the Windows system. Using a USB card reader on the Pi 3B+ you can use the SD Copier to clone the running OS. Have you tried the ori...
by liudr
Wed Jun 13, 2018 12:59 am
Forum: General discussion
Topic: Black screen with cursor (basic openbox?)
Replies: 4
Views: 149

Re: Black screen with cursor (basic openbox?)

Thanks. My original sd card runs fine on an RPI0 system headless. The resolution I got is 720*480. I am not sure how to change that. The command.txt is identical between my original and clone sd cards. I went into raspi-config and set the resolution to 1280*720 and rebooted. The result is the same. ...
by liudr
Mon Jun 11, 2018 11:12 pm
Forum: General discussion
Topic: Black screen with cursor (basic openbox?)
Replies: 4
Views: 149

Black screen with cursor (basic openbox?)

I have the most recent Raspbian on an SD card running on RPI3B+. Did the apt-get upgrade. I enabled vnc and was using vnc for all my interactions with it. I then made a copy using win32 image writer. The original sd card went into an RPI0. The clone went into the RPI3B+. The original card in RPI0 wo...
by liudr
Sat Mar 31, 2018 1:46 am
Forum: Python
Topic: Pyserial ungraceful handling of disconnected USB serial adapter
Replies: 5
Views: 320

Re: Pyserial ungraceful handling of disconnected USB serial adapter

For those that develop projects in python on a PC and deploy them on an rpi, this might be relevant. I don't think it is rpi, but rather linux kernel that is better than windows.
by liudr
Fri Mar 30, 2018 5:13 pm
Forum: Python
Topic: Pyserial ungraceful handling of disconnected USB serial adapter
Replies: 5
Views: 320

Pyserial ungraceful handling of disconnected USB serial adapter

I thought since many of us use pyserial with python, it's worth mentioning. I have a recent distro of raspbian running on RPI0W. I have a USB hub and a serial adapter (FT232 based). I have the stock python 3.4 and an older pyserial 3.1.1. If I disconnect the USB serial adapter while the serial port ...
by liudr
Wed Nov 15, 2017 6:12 pm
Forum: General discussion
Topic: Configure RPI 3B as both AP and station?
Replies: 7
Views: 808

Re: Configure RPI 3B as both AP and station?

Yeah, countless subjects on how to set RPI to AP (only) but not alternating or having both up that I could find. I think that the RPI is not ready to do both. I'll think about a different way, maybe bluetooth. The RPI is sealed in a waterproof box and connection to is can only be wireless. I can bri...
by liudr
Tue Nov 14, 2017 7:42 pm
Forum: General discussion
Topic: Configure RPI 3B as both AP and station?
Replies: 7
Views: 808

Re: Configure RPI 3B as both AP and station?

Most things you said didn't reflect my intent so I will describe once more for everyone to better understand what I am trying to do. I have a little example from a wifi-enabled camera. This camera made by a networking company can connect to my home wifi router so it can upload pictures to an online ...
by liudr
Tue Nov 14, 2017 6:43 am
Forum: General discussion
Topic: Configure RPI 3B as both AP and station?
Replies: 7
Views: 808

Configure RPI 3B as both AP and station?

I am looking for ways to configure RPI 3B as both AP and station. My goal is to use the AP mode and a simple webpage hosted on RPI to collect information. Say I have my RPI running headless and just powered up. I need to give it PSK for the hotspot it's supposed to connect to. I connect to RPI's AP ...
by liudr
Wed Oct 11, 2017 6:11 pm
Forum: General discussion
Topic: I am trying to build my own display device for my raspberry pi
Replies: 8
Views: 2590

Re: I am trying to build my own display device for my raspberry pi

It's a risk but maybe they are going with USB color coding (if it is USB):

https://www.google.com/search?q=USB+col ... 8&oe=utf-8

Don't destroy the cable just yet. Use jumper wire on the two-row connector for a test. Got an old USB mouse that's no longer working? Use its cable.
by liudr
Tue Oct 10, 2017 9:17 pm
Forum: General discussion
Topic: I am trying to build my own display device for my raspberry pi
Replies: 8
Views: 2590

Re: I am trying to build my own display device for my raspberry pi

How is C1 connected to your laptop, via a ribbon cable? Are there any markings on either C1 or the connector on the motherboard?

Does the small board have anything on the other side for a touch screen controller IC?
by liudr
Tue Oct 10, 2017 3:08 am
Forum: Raspberry Pi Desktop for PC and Mac
Topic: STICKY: X86 Debian Jessie with PIXEL desktop for PC and Mac (obsolete)
Replies: 231
Views: 76790

Re: STICKY: Debian Jessie with PIXEL desktop i386 for PC and Mac

best-tester, Thanks for your help. I will definitely wait for the stretch version of rpi PC. I tried debian 9 after posting here but it has only a little bit of advantage. The integrated wifi worked after some googling. The audio still won't work and touch pad is difficult to work with. I never got ...
by liudr
Sun Oct 08, 2017 9:29 pm
Forum: General discussion
Topic: What to do if you can't port forward rasperry pi?
Replies: 9
Views: 1024

Re: What to do if you can't port forward rasperry pi?

I use teamviewer. Install this host on raspberry pi:

https://download.teamviewer.com/downloa ... _armhf.deb


Install a regular PC client to connect to your raspberry pi:

https://www.teamviewer.com/en/download/
by liudr
Sun Oct 08, 2017 8:47 pm
Forum: General discussion
Topic: using arduino motor shield with rpi
Replies: 1
Views: 255

Re: using arduino motor shield with rpi

There are many types of motor shields made for arduino. If you point out the webpage that describes your motor shield, I bet you will get some answers. Also, what is a fully working solution? What are even your problems you want to solve with the shield?
by liudr
Sun Oct 08, 2017 7:29 pm
Forum: Raspberry Pi Desktop for PC and Mac
Topic: STICKY: X86 Debian Jessie with PIXEL desktop for PC and Mac (obsolete)
Replies: 231
Views: 76790

Re: STICKY: Debian Jessie with PIXEL desktop i386 for PC and Mac

I am running raspbian PC on my asus x205ta netbook (2015-16 model). I have it running without wifi, sound, battery monitor, or multi-touch (just need two finger scroll). Is this the right thread to raise machine specific questions or will we get a sub forum for raspbian pc? To get wifi, I threw a do...
by liudr
Fri Sep 22, 2017 5:48 am
Forum: General discussion
Topic: Sharing python code for students to run online
Replies: 6
Views: 657

Re: Sharing python code for students to run online

Hi, Have a look at https://trinket.io Hope this helps. Thanks. I can't find Python shell though. I can only run the code and view the output but I can't say type in a value in the shell to check its values. Also the included modules are very limited and each module is incomplete. The numpy module d...
by liudr
Fri Sep 22, 2017 4:38 am
Forum: General discussion
Topic: Sharing python code for students to run online
Replies: 6
Views: 657

Re: Sharing python code for students to run online

No git! Students don't know how to use git. I barely know how myself. I found this site that does what I need, with a twist though: repl.it I signed up as a google account user and saved my Python code. It has the right modules to run it. I can also create a link to share with anyone. Here is the li...
by liudr
Thu Sep 21, 2017 8:38 pm
Forum: General discussion
Topic: Sharing python code for students to run online
Replies: 6
Views: 657

Sharing python code for students to run online

I am wondering what would be the best method to share python code with my students. I know that if I don't require it, they won't install it, or any of the required modules. It's not a python class, but a science class. The code can help them understand the subject materials. Are there any online pl...
by liudr
Sun Aug 20, 2017 3:38 am
Forum: Off topic discussion
Topic: Industrial rated PI equivalent boards
Replies: 26
Views: 10721

Re: Industrial rated PI equivalent boards

Digi international also has an industrial quality SBC connect core

https://www.digi.com/products/embedded-systems

They are also in the 200USD range, designed after pi has already become popular.
by liudr
Fri Aug 18, 2017 10:29 pm
Forum: General discussion
Topic: Copy made with RPI SD card copier couldn't finish boot
Replies: 2
Views: 444

Copy made with RPI SD card copier couldn't finish boot

I am setting up 3 RPI stations. I made 3 16GB clone cards from my original. Two booted fine and the third didn't finish boot. I swapped SD cards and the third RPI booted fine and worked alright. I wonder what caused the stuck boot sequence, SD card? RPI? The copying? Here is my screen shot:
by liudr
Fri Aug 18, 2017 10:16 pm
Forum: General discussion
Topic: Profile in use by another Chromium process on another computer
Replies: 2
Views: 478

Profile in use by another Chromium process on another computer

I have cloned my Raspbian jessie latest distro into 3 clones, from a 32GB card to three 16GB cards to run three setups in a student lab. Once I connected one clone online, it reported this error when I tried to run Chromium: "Profile in use by another Chromium process on another computer" Attached i...
by liudr
Fri Aug 18, 2017 10:09 pm
Forum: Automation, sensing and robotics
Topic: OK to remove power LED
Replies: 9
Views: 1352

Re: OK to remove power LED

So I finally found some time and made a small board with resistors and MOSFETS for the LEDs. With the overlay the indicator works pretty well. As soon as shutdown is ready, the LED turns on. Also I didn't configure the pin in GPiO library that could cause conflict. Thanks for the solution.
by liudr
Wed Aug 09, 2017 5:39 pm
Forum: General discussion
Topic: Making backups is getting hard
Replies: 10
Views: 1012

Re: Making backups is getting hard

OK, I must have confused myself yesterday. I did more tests. Using paragon backup and recovery free 2016 version I can still back up and restore/clone. What I can't do is resizing the Linux partition: I used to restore linux partition into a smaller space than the partition that I backed up. There's...
by liudr
Wed Aug 09, 2017 3:55 am
Forum: General discussion
Topic: Making backups is getting hard
Replies: 10
Views: 1012

Making backups is getting hard

I used to be able to make backups and copies using "paragon backup and restore" free 2014 version. I could even restore the FAT partition into a larger size so I can save data on it and easily pops it into a PC and read the data. Now it's all impossible. The program fails to back up the Linux partit...

Go to advanced search