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by arcanon
Wed Apr 16, 2014 8:10 am
Forum: Automation, sensing and robotics
Topic: Arduino/Pi Robot
Replies: 29
Views: 29089

Re: Arduino/Pi Robot

I have ScaviSlam running on a server and the PI sends streams to that. Its all rather slow because I only have debug mode. That is where my time ran out.... The 3D reconstruction provided from my system was fairly course (the steps between different levels of depth was quite high). I don't know if I...
by arcanon
Mon Feb 24, 2014 7:35 pm
Forum: Networking and servers
Topic: Captive Portal - CoovaChilli
Replies: 30
Views: 28549

Re: Captive Portal - CoovaChilli

At last, I found a way to allow anonymous users per MAC address and then you can track each user to only allow 30 min per day. I can't believe this feature is not there by default and its so easy to up in. Details at:
http://subgroup-ash.blogspot.de/2014/02 ... allow.html
by arcanon
Sat Dec 07, 2013 4:34 pm
Forum: Automation, sensing and robotics
Topic: Slam mapping
Replies: 2
Views: 2989

Re: Slam mapping

I am slowly getting towards SLAM.

http://subgroup-ash.blogspot.de/2013/12 ... islam.html

It kindof makes sense to use ROS though... because then you get path finding and a bunch of other things at the same time.
by arcanon
Sat Dec 07, 2013 4:32 pm
Forum: Automation, sensing and robotics
Topic: Arduino/Pi Robot
Replies: 29
Views: 29089

Re: Arduino/Pi Robot

I am slowly getting towards SLAM. Have the stereo cam (although you can use mono) http://subgroup-ash.blogspot.de/2013/12/a-step-towards-slam-compiling-scavislam.html It kind of makes sense to use ROS though... because then you get path finding and a bunch of other things at the same time. Then you ...
by arcanon
Fri Nov 29, 2013 11:46 am
Forum: Automation, sensing and robotics
Topic: My project - i need suggestions & help
Replies: 10
Views: 1991

Re: My project - i need suggestions & help

Simple robot/cam h bridge setup below: http://subgroup-ash.blogspot.de/2013/09/a-new-build-speed-control-and.html http://subgroup-ash.blogspot.de/2013/02/rasberry-pi-robot-with-l293-atmega8.html to power the pi I just use a normal cellphone "battery extender". those things you buy that allow you to ...
by arcanon
Wed Nov 27, 2013 12:14 pm
Forum: C/C++
Topic: C / C++ API for RPI Camera board??
Replies: 23
Views: 14617

Re: C / C++ API for RPI Camera board??

yes, but there is no out of the box to http stream in browser as of yet. There is a solution on the forums somewhere (i think using ffmpeg to do the transport). You can also stream to a server app that could use opencv to do image analysis or a live stereo camera. https://github.com/arcanon/raspbot ...
by arcanon
Sun Nov 10, 2013 10:32 am
Forum: Camera board
Topic: A c++ camera api
Replies: 35
Views: 24019

Re: A c++ camera api

So I played around with this this weekend stereo.jpg Here is the youtube result in anaglyph stereo http://www.youtube.com/watch?v=j3TuHyuE4ew Details here http://subgroup-ash.blogspot.de/2013/11/stereo-camera-with-2-raspberry-pis-so-i.html In short I streamed the 2 cameras to a PC where I decoded us...
by arcanon
Fri Nov 01, 2013 12:47 pm
Forum: Camera board
Topic: A c++ camera api
Replies: 35
Views: 24019

Re: A c++ camera api

and are you going to put your code in a repository? github or the likes
by arcanon
Fri Nov 01, 2013 9:22 am
Forum: Camera board
Topic: A c++ camera api
Replies: 35
Views: 24019

Re: A c++ camera api

Right now I bet the best test is to use 2 Raspberry pis.

Another idea is to mode one camera with 2 lenses. Take to cameras and stick the lenses onto one sensor. Does anyone know if this would give a good enough stereo effect? would the eye separation and so on be enough.
by arcanon
Thu Oct 31, 2013 10:10 am
Forum: Beginners
Topic: Wants to develop a Simple toy Car
Replies: 1
Views: 711

Re: Wants to develop a Simple toy Car

hmmm, the remote control cars probably already have h-bridges and servos that would work. Here was my attempt at manually building a car from scratch with the L293 hbridge: http://subgroup-ash.blogspot.de/2013/09/a-new-build-speed-control-and.html http://subgroup-ash.blogspot.de/2013_02_01_archive.h...
by arcanon
Sat Oct 26, 2013 10:55 pm
Forum: Camera board
Topic: Pi-Noir - 'Night' vision camera (IR filter removed)
Replies: 57
Views: 32569

Re: Pi-Noir - Night vision camera

My point is that it should be made clear what it can do. so far there has been no proof of concept that that it could be used for something useful. what watt'age of infrared lights is needed to light something 50m away? the camera is not designed for IR, so i would not be surprised it does not perfo...
by arcanon
Sat Oct 26, 2013 7:17 pm
Forum: Camera board
Topic: Pi-Noir - 'Night' vision camera (IR filter removed)
Replies: 57
Views: 32569

Re: Pi-Noir - Night vision camera

I think the real value of the Pi NOIR camera needs to be made obvious. I removed my IR filter and so far, it looks like the IR detection capabilities are very week. I am not experienced with IR strength in general and all I have to test is a TV remote, but it looks like the camera can only pick the ...
by arcanon
Sat Oct 26, 2013 12:00 pm
Forum: Camera board
Topic: CSI Camera, Car and Raspistill . Problems
Replies: 12
Views: 4820

Re: CSI Camera, Car and Raspistill . Problems

@james

which code controls the "line length"? can we try alter this without firmware/driver updates?
by arcanon
Wed Sep 11, 2013 1:05 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Interfacing RPi to Arduino
Replies: 14
Views: 6956

Re: Interfacing RPi to Arduino

You can by a atmega chip that runs at 3.3V. I payed 2 euros for my atmega8. No level shifting necessary. I make use of the duplex SPI interface to send commands to the atmega. Details described here:

http://subgroup-ash.blogspot.de/2013/09 ... l-and.html
by arcanon
Wed Sep 11, 2013 1:01 pm
Forum: C/C++
Topic: Hooking up a Arduino Due to the Pi
Replies: 4
Views: 3016

Re: Hooking up a Arduino Due to the Pi

I have a duplex SPI setup running between an atmega8 and the PI. Not sure about the max speeds, code and setup is here:

http://subgroup-ash.blogspot.de/2013/09 ... l-and.html

uses quick2wire python to get it running.
by arcanon
Wed Sep 11, 2013 12:59 pm
Forum: Automation, sensing and robotics
Topic: Raspberry Pi - How to control motors...
Replies: 48
Views: 29261

Re: Raspberry Pi - How to control motors...

Here is another solution with a L293 controlling 2 DC motors and that being controlled by an atmega8. The atmega is connected via SPI to the PI.
http://subgroup-ash.blogspot.de/2013/09 ... l-and.html
by arcanon
Wed Sep 11, 2013 12:55 pm
Forum: HATs and other add-ons
Topic: DC motor
Replies: 12
Views: 10605

Re: DC motor

I have a adruino doing the speed control of an LP293, so the PI's GPIO pins are kept free. The speed is send over an SPI interface. Maybe thats a solution for you. See http://subgroup-ash.blogspot.de/2013/09 ... l-and.html
by arcanon
Fri Jun 07, 2013 8:29 am
Forum: General discussion
Topic: Delivery of the Raspberry pi
Replies: 6
Views: 1396

Re: Delivery of the Raspberry pi

Yeah, my issues with RS was that I did not get a dispatch email. Also some emails were filtered by Google spam filters. eventually they offered to resend, but luckily 2 days later the package arrived (I ordered from Germany). All in all about a month for new raspberry pis and 2 weeks for the camera....
by arcanon
Mon Mar 04, 2013 11:13 pm
Forum: Automation, sensing and robotics
Topic: Robot with L293, atmega8 using SPI communication
Replies: 2
Views: 1137

Re: Robot with L293, atmega8 using SPI communication

Well, my thinking was that SPI was simple and that eventually I could connect a few SPI devices. I *think* if you do the clock select line manually you could do this for more than 2 chips (raspi has only 2 chip select lines accessible by the driver). SPI is supposed to be the fastest as well (over U...
by arcanon
Sun Feb 24, 2013 2:59 pm
Forum: Automation, sensing and robotics
Topic: Robot with L293, atmega8 using SPI communication
Replies: 2
Views: 1137

Robot with L293, atmega8 using SPI communication

Here is my attempt at building a simple robot from the ground up. Circuit diagrams are included in the link. Uses atmega8 + L293 motor driver + dc motors + webcam + wifi + 2000ma 5V battery + 4.8V motor battery.

http://subgroup-ash.blogspot.de/2013/02 ... mega8.html
by arcanon
Sun Feb 24, 2013 2:48 pm
Forum: Automation, sensing and robotics
Topic: Remote Control Vehicle
Replies: 8
Views: 7304

Re: Remote Control Vehicle

Here was my effort to build something from the ground up:

http://subgroup-ash.blogspot.de/2013/02 ... mega8.html

Uses keyboard or voice control input + web cam and wifi.
by arcanon
Sun Jan 20, 2013 11:33 am
Forum: Graphics, sound and multimedia
Topic: USB Cams and Motion on Debian
Replies: 78
Views: 84046

Re: USB Cams and Motion on Debian

I *think* the issue with motion not being able to handle 1920x1080 frames is because it does some image analysis in between and this is to slow. Then the CPU does not process the USB packets from the web cam fast enough and the driver complains/usb device gets confused giving garbage and dropped fra...
by arcanon
Sun Dec 16, 2012 5:26 pm
Forum: HATs and other add-ons
Topic: avrdude: AVR device not responding
Replies: 17
Views: 20309

Re: avrdude: AVR device not responding

Oh my word, this is amazing! It works and event with software PWM clock simulation. So I bought my own atmega8L 8PU to use with the rasberry pi (cheap skate ;)), but then I messed up by programming the wrong fuses. I intended to just use the internal clock, but instead I used the same settings as wa...
by arcanon
Fri Dec 07, 2012 7:56 pm
Forum: Troubleshooting
Topic: USB redux
Replies: 514
Views: 201713

Re: USB redux

Just posting an interesting observation. I finally got HD web streaming to work from a USB camera. The trick was that the software had to be able to capture data fast enough. If I set it to 5fps, it does not work, but at 15 and up all is good. This seems to be inline from the previous error data "th...
by arcanon
Fri Dec 07, 2012 7:37 pm
Forum: Graphics, sound and multimedia
Topic: USB Cams and Motion on Debian
Replies: 78
Views: 84046

Re: USB Cams and Motion on Debian

So I tried using MJPG-streamer and I can now get HD working. Here is the tutorial http://wolfpaulus.com/journal/embedded/raspberrypi_webcam The strange thing is that if I try capture at 5fps at 1920x1080, it does not work, but at 15-30fps its fine. This seems to fit with the error I got before that ...

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