Go to advanced search

by JonnyAlpha
Thu Jul 05, 2018 4:23 pm
Forum: Troubleshooting
Topic: Missing Task Bar and Corrupted White Desktop
Replies: 7
Views: 870

Re: Missing Task Bar and Corrupted White Desktop

ShiftPlusOne wrote:
Thu Jul 05, 2018 2:36 pm
Sorry, that should've been history.log, not term.log
DOH!

Oh well all fixed now :-)
by JonnyAlpha
Thu Jul 05, 2018 2:25 pm
Forum: Troubleshooting
Topic: Missing Task Bar and Corrupted White Desktop
Replies: 7
Views: 870

Re: Missing Task Bar and Corrupted White Desktop

Here it is: Log started: 2017-08-16 04:28:00 (Reading database ... 122646 files and directories currently installed.) Preparing to unpack .../python3-pip_9.0.1-2+rpt2_all.deb ... Unpacking python3-pip (9.0.1-2+rpt2) over (9.0.1-2) ... Preparing to unpack .../python-pip_9.0.1-2+rpt2_all.deb ... Unpac...
by JonnyAlpha
Thu Jul 05, 2018 1:52 pm
Forum: Troubleshooting
Topic: Missing Task Bar and Corrupted White Desktop
Replies: 7
Views: 870

Re: Missing Task Bar and Corrupted White Desktop

To help understand what happened, could you post your /var/log/apt/history.log? The fix may be to run "sudo apt install raspberrypi-ui-mods", but it would be good to figure out what happened. Entering /var/log/apt/history.log Results in the following: bash: /var/log/apt/history.log: Permission denied
by JonnyAlpha
Thu Jul 05, 2018 12:04 pm
Forum: Troubleshooting
Topic: Missing Task Bar and Corrupted White Desktop
Replies: 7
Views: 870

Missing Task Bar and Corrupted White Desktop

Hi; I have 6 Raspberry Pi's at school which I have flashed a new image of Stretch. After enabling VNC and SSH for remote access (we are building robots), when logging in the start menu disappeared. After reading a post about the same issue it suggested that there was a bug with earlier versions of S...
by JonnyAlpha
Wed May 30, 2018 9:00 pm
Forum: Python
Topic: Updating python-skimage
Replies: 1
Views: 1417

Updating python-skimage

Hi; Whilst following a document scanner guide by Adrian Rosebrock I have encountered some issues with a python package python-skimage. One of the modules associated with python-skimage. The script calls for the import of threshold_local which cannot be found. On further investigation it seems that t...
by JonnyAlpha
Wed May 30, 2018 3:51 pm
Forum: Advanced users
Topic: OpenCV - Best Installation Guide
Replies: 0
Views: 196

OpenCV - Best Installation Guide

Hi; What is the best method of installing OpenCV. I only need it for image processing not as a developer. I have installed it a couple of times before using Adrian Rosebrock's guide here: https://www.pyimagesearch.com/2017/09/04/raspbian-stretch-install-opencv-3-python-on-your-raspberry-pi/ but just...
by JonnyAlpha
Thu May 17, 2018 5:42 pm
Forum: User groups and events
Topic: Robotics Competition SW England
Replies: 0
Views: 6961

Robotics Competition SW England

Having competed in my first ever PiWars, ‪I am now investigating the idea of running a RObotics competition in the South West of England. Challenges will hopefully be based on this years PiWars and will be agreed first with the Cambridge Pi Jam. For those that are not familiar with the competition, ...
by JonnyAlpha
Thu May 17, 2018 5:38 pm
Forum: General discussion
Topic: Pi Wars South West
Replies: 3
Views: 395

Re: Pi Wars South West

Doug;

sorry thought I had replied to you. Thanks for your advice and will re-post. No dates have been set we are in the planning stages.
by JonnyAlpha
Sun May 06, 2018 7:58 am
Forum: General discussion
Topic: Pi Wars South West
Replies: 3
Views: 395

Re: Pi Wars South West

Well that proved popular then 😞
by JonnyAlpha
Tue May 01, 2018 7:50 pm
Forum: General discussion
Topic: Pi Wars South West
Replies: 3
Views: 395

Pi Wars South West

Having competed in my first ever PiWars, ‪I am investigating the idea of running a #PiWars in the South West of England. Challenges will be based on this years PiWars. For those that are not familiar with the competition, It is a. Non Destructive robotics competition open to Schools / Youth teams an...
by JonnyAlpha
Tue Apr 17, 2018 8:20 pm
Forum: Camera board
Topic: Permanently Rotate / Flip Camera
Replies: 2
Views: 4505

Permanently Rotate / Flip Camera

Hi; I have a v2 camera attached to my robot and the way it is position the images are upside down. Is there a way to flip or rotate the image 180 degrees permanently rather than whenever I take a pic? The reason is that the robot uses OpenCV and I need images and video to be the correct way around? ...
by JonnyAlpha
Wed Apr 11, 2018 7:35 pm
Forum: Automation, sensing and robotics
Topic: Robot Navigation - Mapping or Map Reading
Replies: 5
Views: 1166

Re: Robot Navigation - Mapping or Map Reading

Mike,

It's Bill Harvey, we have been conversing by email and on Discord. Nice to see you lurking here as well. I use the user name JonnyAlpha for several forums, a hang up from my childhood love of 2000AD. 😂

Yes I think I will really get into OpenCV and Machine Learning after PiWars.
by JonnyAlpha
Wed Apr 11, 2018 9:57 am
Forum: Automation, sensing and robotics
Topic: Robot Navigation - Mapping or Map Reading
Replies: 5
Views: 1166

Re: Robot Navigation - Mapping or Map Reading

Thanks for the reply but line following is not an option (I can already do that with OpenCV). I am trying to find a more complex method of vision. I know that sound silly but eventually I want a robot that can map an unknown area.
by JonnyAlpha
Tue Apr 10, 2018 3:15 pm
Forum: Automation, sensing and robotics
Topic: Robot Navigation - Mapping or Map Reading
Replies: 5
Views: 1166

Robot Navigation - Mapping or Map Reading

Whilst prepping for PiWars 2018 I have started to look at OpenCV for robot vision. I am currently working on the Maze challenge and am looking at a couple of approaches. One option is to navigate the maze by locating the boundaries of the maze (the walls) and driving along a centre line in between t...
by JonnyAlpha
Fri Mar 30, 2018 8:47 pm
Forum: Python
Topic: pigpio - cleaning up GPIO pins
Replies: 6
Views: 2902

Re: pigpio - cleaning up GPIO pins

This thread isn’t about 3 years old. A thruster is a brushless motor and an esc is used to drive it. Not sure why you are using set_servo?

Anyway I found this which should help you out:

http://www.instructables.com/id/Driving ... pberry-Pi/
by JonnyAlpha
Sun Mar 18, 2018 6:15 pm
Forum: Troubleshooting
Topic: Bluetooth Non Genuine Playstation 3 Controllers
Replies: 1
Views: 207

Bluetooth Non Genuine Playstation 3 Controllers

OK so I have spent a couple of days trying to get what turns out to be a non genuine (I think) a Sony Playstation 3 Controller Connected to my RPi 3. I have upgraded the kernel to 4.15.9 and have updated bluez to 5.49 however it is still not connecting. Before I go out and spend £49 of our after sch...
by JonnyAlpha
Thu Mar 01, 2018 5:39 pm
Forum: Advanced users
Topic: OpenCV Gtk-WARNING
Replies: 0
Views: 220

OpenCV Gtk-WARNING

Hi; I am setting up OpenCV on a robot for PiWars. I have installed OpenCV and can finally get the program to start but it then close with a Gtk warning: Gtk-WARNING **: cannot open display: Is this because it is trying to open a display that is not connected? This is a robot that I am connecting rem...
by JonnyAlpha
Mon Feb 12, 2018 10:46 am
Forum: Automation, sensing and robotics
Topic: PiWars 2018 - Remote Control Better / Best Option Advice
Replies: 0
Views: 229

PiWars 2018 - Remote Control Better / Best Option Advice

Hi; Sanity check and advice please. For remote control we are currently using a Pi Hut 2.4Ghz Wireless Game Controller. We have a couple of issues with this method: (a). Every so often, normally at crucial moments' the connection seems to get lost and either the Robot crashes or stops and cannot be ...
by JonnyAlpha
Fri Jan 26, 2018 10:38 pm
Forum: Advanced users
Topic: PiCamera Version
Replies: 6
Views: 1329

Re: PiCamera Version

Many thanks all. I will pass it on.
by JonnyAlpha
Tue Jan 23, 2018 7:00 pm
Forum: Advanced users
Topic: PiCamera Version
Replies: 6
Views: 1329

PiCamera Version

Posting on behalf of Dave Akerman who asked the question on Twitter:

Quick question - is there a simple way to find the model or resolution of Pi camera connected, from a bash script? No doubt it can be done in Python with picamera but is there something simpler ?

Thanks
by JonnyAlpha
Fri Dec 29, 2017 6:32 pm
Forum: Advanced users
Topic: Powering a Pi with Mains AC / DC Adaptor with Battery Pack Attached
Replies: 7
Views: 1100

Re: Powering a Pi with Mains AC / DC Adaptor with Battery Pack Attached

So a reply from PiBorg said that it should be ok, so I tested it and it was fine.
Just make sure you switch off (and or) disconnect any battery / power supply to motor driver board before applying power to the Raspberry Pi.
by JonnyAlpha
Wed Dec 27, 2017 5:57 pm
Forum: Advanced users
Topic: Powering a Pi with Mains AC / DC Adaptor with Battery Pack Attached
Replies: 7
Views: 1100

Re: Powering a Pi with Mains AC / DC Adaptor with Battery Pack Attached

Why not ask the product maker/supplier after all it's there product design they should know rather than expecting some on on the forum to have done what you want to do. Not every possible bit of kit and every way of using it will have been tested by someone on the forum. I have asked the product ma...
by JonnyAlpha
Wed Dec 27, 2017 5:55 pm
Forum: Advanced users
Topic: Powering a Pi with Mains AC / DC Adaptor with Battery Pack Attached
Replies: 7
Views: 1100

Re: Powering a Pi with Mains AC / DC Adaptor with Battery Pack Attached

Main problem will be power supply contention, where two power supplies with even only slightly different voltages will cause high currents to flow from to another if directly connected, limited by parasitic cable resistance. If the add-on board has a series diode on the 5V rail, it should be fine (...
by JonnyAlpha
Sat Dec 23, 2017 7:25 pm
Forum: Advanced users
Topic: Powering a Pi with Mains AC / DC Adaptor with Battery Pack Attached
Replies: 7
Views: 1100

Re: Powering a Pi with Mains AC / DC Adaptor with Battery Pack Attached

Thanks for the reply but that wasn't the question :-)
by JonnyAlpha
Sat Dec 23, 2017 3:21 pm
Forum: Advanced users
Topic: Powering a Pi with Mains AC / DC Adaptor with Battery Pack Attached
Replies: 7
Views: 1100

Powering a Pi with Mains AC / DC Adaptor with Battery Pack Attached

Hi; I have just assembled a MonsterBorg which comes with a Thunderborg Motor Driver. The setup (MonsterBorg / ThunderBorg and Raspberry Pi) is powered by 10 x AA batteries. The Pi receives its power from the ThunderBorg via the GPIO (the first 6 pins are connected to the ThunderBorg). Removing the b...

Go to advanced search