Archive for April, 2013

64bit linux box in my boot

Posted in Hardware, Linux on April 16, 2013 by asteriondaedalus

Got a deal through an auction site and got myself a box to be my 64bit linux server (for some of the 64-bit python toys).

Just a 3Ghz Core Duo HP box.  Comes with nifty monitor that has case attached and monitor can slide up and down.

64bit

I just need a video switch so I can pair this with my 32bit Atom/Linux box.

P144149

3d Scanner/Lidar

Posted in Android, Sensing, Vision on April 13, 2013 by asteriondaedalus

Apart from experiments in wireless location (Bluetooth, Xbee/SNAP and WiFi all provide RSSI values), there is also a likely need for visual odometry.

SLAM, which is a passive sensing approach, is on the cards.  The other is either of two approaches to active visual odometry:

  1. Laser line and webcam.
  2. Projector and websam (structured light).

So, I few experiments on the go (I still have to build my two 64bit dual core AMD boxes to give me some distributed processing grunt) but a webcam with:

Item Description
CPU RK3066 Dual Core1.6G (Cortex-A9)
Ram DDR3 1GB
Rom On board NAND Flash 8G
Storage Expansion SD Card + T-Flash(Maximum support 32GB)
Video Format Support: Max.1920*1080 MKV(H.264 HP) AVI RM/RMVB FLV WMV9 MP4
Audio Format Support: MP3/WMA/APE/FLAC/AAC/OGG/AC3/WAV
Picture Format Support: Max.8000×8000 JPEG BMP GIF PNG
Web Camera Support: 0.3M Pixel
Microphone Built-in Microphone
Headphone Support headphone
WIFI Support IEEE 802.11 b/g/n
LAN Support 10/100M RJ45
Bluetooth Support Bluetooth V4.0
Output 1*MINI HDMI port(1.4a spec), Maximum support 1920*1080 60Hz
1*Video port, Support YPbPr output, Maximum support 1920*1080 60Hz
1*Audio port, Support left/right channel output
Ports 1*standard USB port
1*MINI HDMI port
1*RJ45 LAN port
1*Audio output port
1*Video output port
1*MINI USB port, Support OTG
1*MINI USB port for Power
1*TF Card slot
1*SD Card slot
Button 1*Power button
1*Physical button(For upgrading software)
LED 1*LED power indicator

; is a start.

android webcam

This sub $100 device has WiFi, Bluetooth and 10/100 Ethernet built in.  I have ordered two so one can be paired with a laser and one with a miniature led projector (for the structured light work).  Either can be used for monocular SLAM etc.  Paired they could be used for STEREO slam.

I will set up a Seeduino Film as a Laser Driver:

Bluetooth Frame Seeeduino Film

I suspect the various outputs of the webcam (HDMI, AV, USB etc) will allow me to drive a LED projector for the structured light:

Mini_LED_Projector

disappointing but go figure

Posted in Android, Buyer beware!, Hardware on April 10, 2013 by asteriondaedalus

I bought supposedly IP67 certified phone from DHgate to find it isn’t at all water proof (that’s what the ‘7’ of the IP67 stands for).

In fact, I found that the back panel doesn’t fit all that snuggle AND it has two screws supplied to tack it down BUT one of the screws came without a thread.  I have contacted the vendor and we’ll see whether this gets sorted.

However, for a throw away phone to hack for outside robots it will do until the real waterproof phone boom hits.  I half expected the problem as my search of the web found many Asian manufacturers basically lying about the phone ratings.

I was always going to likely silicon seal the thing anyway – although there is an (expensive) alternative.

Let buyer beware.

Note some vendors bother to warn you the phones are not immersible even though “water immersible” is stamped on the back under the “IP67 Certified” embossing.

I have passed the problem off to Australian Consumer affairs they are likely not to do anything since we aren’t wanting to upset the Chinese apparently.