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by klricks
Sat Apr 20, 2019 10:41 pm
Forum: General discussion
Topic: How to uninstall a program.....
Replies: 5
Views: 95

Re: How to uninstall a program.....

LTolledo wrote:
Sat Apr 20, 2019 10:36 pm
1. apt remove --purge [app]
2. apt clean
3. apt auto remove
sudo is required with each of those commands.
by klricks
Sat Apr 20, 2019 7:30 pm
Forum: Beginners
Topic: Move Files With GUI (Startx)
Replies: 2
Views: 74

Re: Move Files With GUI (Startx)

Is there a way to give the GUI (Startx) more permissions? I wanted to move a file to an "include folder" and I can't. It just "bounces back". I assume it is because the GUI doesn't have permission. Also, I tried to edit a .conf file with leafpad editor and it wouldn't let me save it. Again I gather...
by klricks
Sat Apr 20, 2019 4:54 pm
Forum: Troubleshooting
Topic: Rpi 3 b+. Boot from USB not working. Do I have a defective device?
Replies: 8
Views: 170

Re: Rpi 3 b+. Boot from USB not working. Do I have a defective device?

Hi. I try to boot rpi from usb flash drive, because using sd card gives rainbow screen. When I use usb drive with raspbian-stretch nothing happen and power flash drive's indicator doesn't light up, which means there is not power on usb drive. I use official usb power supply and power indicator alwa...
by klricks
Sat Apr 20, 2019 3:39 pm
Forum: Python
Topic: Python 3.5, Error Connecting to Firebase - No module named 'firebase'
Replies: 5
Views: 100

Re: Python 3.5, Error Connecting to Firebase - No module named 'firebase'

Using pip will install to Python 2. Use pip3 to install to Python 3.
by klricks
Fri Apr 19, 2019 9:42 pm
Forum: Troubleshooting
Topic: Window size using VNC
Replies: 2
Views: 59

Re: Window size using VNC

I'm using an R-Pi 3B running headless and accessed via VNC. I had no problems setting this up and connecting to my main machine (Linux). The problem I do have is that when accessing an app in the R-Pi; for example running Claws the first time, it may create a window which is too large for the VNC w...
by klricks
Fri Apr 19, 2019 1:19 pm
Forum: General discussion
Topic: Creating new user (problem)
Replies: 3
Views: 59

Re: Creating new user (problem)

I am triyng to add a new user to my raspberry pi 3b+ without success... pi@raspberrypi:~ $ adduser adduser: Only root may add a user or group to the system. pi@raspberrypi:~ $ sudo su root@raspberrypi:/home/pi# sudo adduser john Adding user `john' ... Adding new group `john' (1001) ... Adding new u...
by klricks
Fri Apr 19, 2019 12:58 pm
Forum: General discussion
Topic: Broadcom bcm2837b0 Thermal Resistance / Datasheet
Replies: 1
Views: 110

Re: Broadcom bcm2837b0 Thermal Resistance / Datasheet

I am currently working on thermal management system for a raspberry pi cluster and would requiere information about the peak power consumption and internal thermal resistance of the Raspberry Pi 3B+ bcm2837b0 SoC. I unfortunately I failed to find any datasheet of the SoC. Does anybody know where I ...
by klricks
Fri Apr 19, 2019 3:13 am
Forum: General discussion
Topic: Help with copying a folder in raspberry pi3
Replies: 3
Views: 84

Re: Help with copying a folder in raspberry pi3

When trying to make an auto start instructions ~/.config/lxsession/LXDE-pi/autostart I am getting an error that this folder doesn’t exist How do I copy from the global file /etc/xdg/lxsession/LXDE-pi/autostart And copy the lxsession file to /home/pi I know you use the cp command but I need detailed...
by klricks
Thu Apr 18, 2019 1:22 pm
Forum: Beginners
Topic: How to calculate resistors...
Replies: 49
Views: 764

Re: How to calculate resistors...

....... .... You made exactly my point with the LED example - it is designed to use up to a certain amount of current before it burns it out. It will not ONLY DRAW the amps it desires - it will allow too much amps to cross it and burn itself out. Basic Ohms Law and available specs (and the new know...
by klricks
Thu Apr 18, 2019 12:44 pm
Forum: Troubleshooting
Topic: Cannot stop screen blanking Raspbian Stretch
Replies: 3
Views: 75

Re: Cannot stop screen blanking Raspbian Stretch

Finally after a lot of trying i think i got a solution For the people who have the same problem, i created a file /etc/X11/xorg.conf with code: Section "ServerFlags" Option "BlankTime" "0" Option "StandbyTime" "0" Option "SuspendTime" "0" Option "OffTime" "0" EndSection Now the screen is on for abo...
by klricks
Thu Apr 18, 2019 4:46 am
Forum: Beginners
Topic: How to calculate resistors...
Replies: 49
Views: 764

Re: How to calculate resistors...

Well, like in my original post - one way to approach this is to take the maximum power supplied (16mA), the source voltage 3.3V, and the load (in this case LED - but not focused specifically of LEDs here) and based on the load amps, 20mA in this case - you calculate the resistor as 206 Ohms. I know...
by klricks
Thu Apr 18, 2019 3:50 am
Forum: Advanced users
Topic: PI 3b power to USB and peripherals. Dependent on PI or power supply?
Replies: 6
Views: 134

Re: PI 3b power to USB and peripherals. Dependent on PI or power supply?

The combined total of all 4 USB ports is limited to 1.2A by a USB power controller circuit. As mentioned the total current allowed into the micro USB power port is limited to 2.6A by the 'poly fuse' So current available to the 5V GPIO pins 2 & 4 is = 2.6A - (whatever the RPi uses + USB + camera + Di...
by klricks
Thu Apr 18, 2019 2:00 am
Forum: Beginners
Topic: How to calculate resistors...
Replies: 49
Views: 764

Re: How to calculate resistors...

I know the equations. Let me explain my confusion. I understand that the RPi has a maximum of 16mA output on a GPIO pin. Say I have an LED that is rated for 20mA. Do I use Ohms law and say I=16mA (0.016A), V=3.3V, and thus R=206ohms? So, if I use a 206ohm resistor, does that mean that this circuit ...
by klricks
Wed Apr 17, 2019 12:47 pm
Forum: Beginners
Topic: Vérrry old versions - magic place with updates?
Replies: 3
Views: 130

Re: Vérrry old versions - magic place with updates?

Raspbian is based on Debian which do not do rolling updates to any software packages. Once a major update is released, packages are frozen and held at the current versions until the next major release. New releases are done about every 2 years.... Wheezy, Stretch, Buster...etc Only security updates ...
by klricks
Wed Apr 17, 2019 1:52 am
Forum: General discussion
Topic: What would be the charging current for a board like this?
Replies: 11
Views: 297

Re: What would be the charging current for a board like this?

Stop before you cause an explosion (literally!) That is a lithium ion 4S battery balancing module. The charge current is 60mA, but I think you mean the voltage which is NOT 16.8v, but about 4.2v or Less. It is probably designed to work off 5v, but you'd need to check its datasheet to be sure. If yo...
by klricks
Tue Apr 16, 2019 1:02 pm
Forum: Beginners
Topic: Autostart a youtube channel in latest version of Chromium
Replies: 1
Views: 46

Re: Autostart a youtube channel in latest version of Chromium

DSCJordan.Milne wrote:
Tue Apr 16, 2019 12:20 pm
Hi all, I am having an issue getting it to autostart the sky news youtube stream. It works fine if I close the window and open it again. I have tried uninstalling and reinstalling.
Any ideas? ....
Please provide some useful information such as which autostart method and exact command(s) used.
by klricks
Tue Apr 16, 2019 2:43 am
Forum: Troubleshooting
Topic: Unplugged Raspberry Pi and it won't boot anymore.
Replies: 1
Views: 71

Re: Unplugged Raspberry Pi and it won't boot anymore.

I was just working with my Pi through a remote desktop connection and it began to slow down. I decided that it was probably a good sign that I should be done for the night and decided to shut it down. Unfortunately, you can't use the shutdown function in the Pi when using a remote desktop so I had ...
by klricks
Mon Apr 15, 2019 5:10 pm
Forum: General discussion
Topic: disabling screensaver blocked my system
Replies: 5
Views: 132

Re: disabling screensaver blocked my system

Hi, thanks for the answer.... by the way, no menus were available with right-click on the "OB" screen... I checked in /etc/xdg/lxsession/LXDE-pi $ more autostart @lxpanel --profile LXDE-pi @pcmanfm --desktop --profile LXDE-pi @xscreensaver -no-splash point-rpi So, my system is already setup as you ...
by klricks
Mon Apr 15, 2019 1:11 pm
Forum: Troubleshooting
Topic: Raspbian Kills Python GUI App If No User Input
Replies: 4
Views: 109

Re: Raspbian Kills Python GUI App If No User Input

To stop the default screenblanker use these 2 commands: xset -dpms xset s off Add those 2 commands to autstart to make it permanent. /etc/xdg/lxsession/LXDE-pi/autostart However I don't know if the above will fix your issue as I don't believe screen blanking has any effect on running processes??
by klricks
Mon Apr 15, 2019 12:28 pm
Forum: General discussion
Topic: Keyboard macro raspberry pi
Replies: 1
Views: 59

Re: Keyboard macro raspberry pi

Hi, I have been working on an a project that needs to utilise a keyboard macro and I wanted it to use as little power as possible, to do this I need a keyboard macro that is available on the raspberry pi. I have found macros that work on windows and linux but none that work on the rpi. Could anyone...
by klricks
Mon Apr 15, 2019 12:18 pm
Forum: Python
Topic: Import Error: No module named Firebase.
Replies: 3
Views: 583

Re: Import Error: No module named Firebase.

LeLegendS wrote:
Mon Apr 15, 2019 10:20 am
Hi, i would like to update this thread. I'm also facing this issue. Any workaround to fix this? I've tried installed $ sudo pip install firebase-admin but returns errors.
Are you using python 2 (python) -OR- python 3?
by klricks
Mon Apr 15, 2019 12:18 am
Forum: General discussion
Topic: disabling screensaver blocked my system
Replies: 5
Views: 132

Re: disabling screensaver blocked my system

Warning : BLOCKED MY SYSTEM :x Raspberry pi 3 B+, nov 2018 I edited /home/pi/.config/lxsession/LXDE-pi/autostart and added this to the end of what's there: @xset -dpms @xset s off as suggested... result : blank screen at startup no menus just the cursor on the screen !! tried a restoration with shi...
by klricks
Sun Apr 14, 2019 12:58 am
Forum: Automation, sensing and robotics
Topic: show the same video on 2 different display
Replies: 2
Views: 81

Re: show the same video on 2 different display

In addition to a splitter...
Google [ wireless HDMI transmitter]
by klricks
Sat Apr 13, 2019 1:44 pm
Forum: Beginners
Topic: install firefox quantum using alacarte program
Replies: 4
Views: 124

Re: install firefox quantum using alacarte program

What the procedure if I want to install FF Quantum on a system that doesn't have a browser? I used my windows machine to download Quantum 6.0 to a flash drive. I copied the tarball file to my raspberrypi3 and opened the file in Downloads. I provide the output from dmesg and cat /etc/*release* but w...
by klricks
Sat Apr 13, 2019 12:55 pm
Forum: Advanced users
Topic: questions about max_usb_current=1
Replies: 9
Views: 311

Re: questions about max_usb_current=1

You could plug your HDD into an externally powered USB hub to power it, but make sure the hub will provide sufficient power for it. Some USB cables for HDDs have 2 USB plugs: one is power+data, the other is just for power so that you can draw the max current from 2 ports instead of just one. Using ...

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