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by tech-mech
Fri Apr 12, 2019 10:48 pm
Forum: General discussion
Topic: Pi Portable
Replies: 0
Views: 112

Pi Portable

I live near a couple parks here in Portland Oregon so as I want to do some out door robotics I wanted a portable Pi. So I bought a small (13.3 inch) TV with a car cord. It says not to plug anything into the USB update port but I did it any way. So using a small (5.25X7.35X7.5 inch) starting battery ...
by tech-mech
Fri Feb 01, 2019 4:05 pm
Forum: General discussion
Topic: LCD
Replies: 2
Views: 255

Re: LCD

I use an official 7 inch display in a SmartiPi case powered by a large USB recharge battery and a pocket size wireless keyboard. Plug an play. I think of it as my pocket Pi.

Dale
by tech-mech
Thu Jan 03, 2019 10:06 am
Forum: General discussion
Topic: Is Raspbian as easy to use as mate/mint?
Replies: 18
Views: 2764

Re: Raspbian easy to use as mate/mint?

As noted the x86 version uses the RPF desktop mods to LXDE that the ARM version does. But as it is the desktop that makes it easy or not to use they are very close to the same so going from one to the other is like switching from one RPi to another. Also as my netbook is old and slow with not much m...
by tech-mech
Thu Jan 03, 2019 4:13 am
Forum: General discussion
Topic: Is Raspbian as easy to use as mate/mint?
Replies: 18
Views: 2764

Re: Raspbian easy to use as mate/mint?

Raspbian is very easy to use. The RPF has done a great job modifying the LXDE desktop and as it is the official distro it has excellent support. To add GIMP and or Inkscape you can either use apt from the command line or the graphic package manager included with the desktop. To do a proper shutdown ...
by tech-mech
Thu Nov 01, 2018 10:04 pm
Forum: Off topic discussion
Topic: will the raspberry pi get free software cpu?
Replies: 33
Views: 5013

Re: will the raspberry pi get free software cpu?

I am in the USA and have never had any problems using a Pi. I have added many programs to my different cards (some used for testing only) and have yet to see any need to even look for software I would need to pay for. Some programs that cost for an x86 based system are offered free for the Pi. Dale
by tech-mech
Tue Jun 26, 2018 11:52 pm
Forum: Beginners
Topic: Portable Pi Computer--monitor selection and battery use
Replies: 5
Views: 427

Re: Portable Pi Computer--monitor selection and battery use

I have a RPI2 with the official 7" screen but on't use the touch part. I house them in a Smarti Pi case and use a GreatShields 10400 mAh battery that has a 2.1 A USB output, gives very long run time and powers Pi and screen by Y cable. I have several very small keyboards but the one I like best does...
by tech-mech
Sun Jun 03, 2018 6:45 pm
Forum: General discussion
Topic: Control robot over network with keyboard/xbox 360 controller
Replies: 7
Views: 1140

Re: Control robot over network with keyboard/xbox 360 controller

The pigpio module has the network stuff built in. You use the gpio as if local, also allows control of multiple other pis. If you really want extra control with a micro controller check out the Pimoroni Propeller hat. 8 32 bit cores, true parallel control. There is a very vast library of objects,, c...
by tech-mech
Sat Jun 02, 2018 8:03 pm
Forum: General discussion
Topic: Control robot over network with keyboard/xbox 360 controller
Replies: 7
Views: 1140

Re: Control robot over network with keyboard/xbox 360 controller

You will find that pigpio /pigpiod are set up to work over the net. You get full control, and it is straight forward to use. I do not know of another gpio module that does anything close. I have not used it in a while so go to it's web site to get the latest information and examples. Just key in 'pi...
by tech-mech
Sat Jun 02, 2018 4:10 am
Forum: General discussion
Topic: Control robot over network with keyboard/xbox 360 controller
Replies: 7
Views: 1140

Re: Control robot over network with keyboard/xbox 360 controller

I use Idle 3 for Python 3 programming. To get information on a module type help(pigpio") and it will let you know if the module is installed and what commands you can use. Pygame and pigpio both have information and examples on their web sites. Pygame joystick is a little more complicated because yo...
by tech-mech
Fri Jun 01, 2018 4:03 pm
Forum: General discussion
Topic: Plantation Shutter control
Replies: 2
Views: 411

Re: Plantation Shutter control

Sounds very possible to me. How well it works depends on how well you understand programming and the mechanical / electrical design issues. To reduce power consumption I would use a mechanism that would hold position without being powered.

Dale
by tech-mech
Fri Jun 01, 2018 3:53 pm
Forum: General discussion
Topic: Control robot over network with keyboard/xbox 360 controller
Replies: 7
Views: 1140

Re: Control robot over network with keyboard/xbox 360 controller

I have used a USB game controller (Logitech F310) with pigpio / pigpiod. You can use it locally as well as over a net connection. It also allows you to read gpio pins. I used Pygame / pygame joystick to read it. You have to init both but do not need to really set up Pygame.

Dale
by tech-mech
Tue May 22, 2018 10:58 pm
Forum: General discussion
Topic: Remote Desktop Access from Pi to Pi
Replies: 7
Views: 688

Re: Remote Desktop Access from Pi to Pi

I use pigpio with Python 3. It allows you to use the gpio pins locally or remote and allows you to control multiple remote RPis. I have not done naything with robotics for a long time because of other things in my life but I did use a joystick to control a remote robot.

Dale
by tech-mech
Tue Apr 17, 2018 8:02 pm
Forum: Beginners
Topic: Location of application Evince
Replies: 6
Views: 963

Re: Location of application Evince

For reasons I do not understand Evince install puts desktop files in both /usr/share/applications and /usr/share/raspi-ui-overrides/applications which confuses the desktop (again for reasons I do not understand) and so it does not show up in the start menu. To fix the problem I rename or delete the ...
by tech-mech
Wed Mar 07, 2018 11:14 pm
Forum: Beginners
Topic: Building an ebook reader
Replies: 2
Views: 3702

Re: Building an ebook reader

I use the Ebook Viewer part of Calibre. I edited the desktop file to point to the Calibre icon. There is FBreader but I did not like the way I had to sort the books. I use VLC to listen to mp3s while I read.

Dale
by tech-mech
Thu Feb 15, 2018 4:09 am
Forum: General discussion
Topic: Pi Zero W as Controller
Replies: 4
Views: 695

Re: Pi Zero W as Controller

If you enable remote gpio you can use pigpio to both read and write the pins on any pi on your local network. You need the address of each.

I have used this for controlling a robot. I used Python and the pigpio direct but now you can gpio zero also.

Hope this helps.
Dale
by tech-mech
Sat Feb 03, 2018 3:31 am
Forum: Beginners
Topic: Simple RPI Camera
Replies: 3
Views: 527

Re: Simple RPI Camera

Any momentary push button switch will work. Lilypad (Sparkfun) has sew-able slide and push button switches. You can also use switches soldered to soldered to circuit boards that mimic breadboards. The RPF Pi Zero case has a short camera cable and cover to hold the camera. There is example code to us...
by tech-mech
Thu Feb 01, 2018 1:34 am
Forum: Advanced users
Topic: Car engine controls help needed.
Replies: 25
Views: 2486

Re: Car engine controls help needed.

Please do not take what I said as anything to do with it being a car or to do with general safety. You really need to understand just how harsh the automotive electrical system is to really modify it. Most mechanics lack the electrical understanding not to mention electronic understanding (there is ...
by tech-mech
Wed Jan 31, 2018 9:01 pm
Forum: Advanced users
Topic: Car engine controls help needed.
Replies: 25
Views: 2486

Re: Car engine controls help needed.

First off I am an FAA A&P and have worked on and studied cars since a preteen. The '12V' automotive electrical system can swing from a low of around 8V during start to a high of 14.7 or so when the alternator is working. The in put to the ignition coil could be below 12V when running, but at each sp...
by tech-mech
Tue Dec 05, 2017 2:31 am
Forum: General discussion
Topic: Analogue motor control
Replies: 6
Views: 887

Re: Analogue motor control

Pygame Joystick will give you a -1 to +1 float value from a USB joystick or game controller. This is what I am using and you don't need to really use pygame, just init it. There are way too many motor drive board to mention them, both HAT and connected other ways. Just select the voltage and current...
by tech-mech
Fri Nov 24, 2017 10:24 am
Forum: General discussion
Topic: Select by switches
Replies: 0
Views: 213

Select by switches

About a year ago I tried a program to combine all 4 of the LED patterns for the tree from The Magpi. Not sue where the code is. The idea was to set the pi to boot to the command line and have the program auto start. It checked for a push button press and if found exited the program. Next it checked ...
by tech-mech
Tue Nov 14, 2017 9:40 pm
Forum: General discussion
Topic: Desktop issue
Replies: 1
Views: 402

Desktop issue

When I minimize an application and open another that overlaps where the minimized one was the cursor still finds the old edges and reacts to them. I am using Rasbian Stretch that is kept up to date on a 2B. This is happening on all my systems. I do not remember having this problem in the past. Dale
by tech-mech
Tue Sep 19, 2017 10:12 pm
Forum: General discussion
Topic: reformatting and SD card, which volume?
Replies: 4
Views: 976

Re: reformatting and SD card, which volume?

I have just erased everything from the FAt partition and copied the noobs info to that partition and reinstalled. I use an older win system. The installer will only look at the FAT partition anyway and then expand the file system to fill the rest of the card. I use some cards as test systems and so ...
by tech-mech
Tue Aug 22, 2017 3:50 am
Forum: Advanced users
Topic: Raspberri for CNC.
Replies: 4
Views: 5412

Re: Raspberri for CNC.

I am not sure what you are asking or trying to do. The aliexpress link is an Arduino board and you would use a USB cable. Do you have a cnc program? As cnc can have multiple things going on at the same time I would use a Pimoroni Propeller hat. There is code for cnc in the Parallax Object Exchange. ...
by tech-mech
Tue Aug 22, 2017 3:29 am
Forum: General discussion
Topic: Setting up stretch
Replies: 2
Views: 568

Re: Setting up stretch

To remove the icons I use nano to edit the file panel. From the home directory it is in .config/lxpanel/LXDE-pi/panels . You can use ls -a to find it. You could make a copy of the file first just in case you mess up. There are several lines you need to remove. It is a text file so is easy to read an...
by tech-mech
Sun Aug 06, 2017 5:00 pm
Forum: Beginners
Topic: Controlling RPi via another RPi
Replies: 30
Views: 4749

Re: Controlling RPi via another RPi

I admit to not being familiar with the current version of gpio zero so I do not know what it can do. I will look at it soon. I have used a Logitech Attack 3 joystick and a Logitech F310 gamepad as well as a GT steering wheel. Pygame jaystick returns a value of -1 to +1 for each axis. I wonder if the...

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