01.30.07

Project ideas…

Posted in Future Project Ideas at 2:45 pm by philwinder

  • US range finder for ZBot
  • US Phased Array
  • 2d/3d phased array
  • 2d phased array without beamforming
  • stereo phased array? (2 tx’s, many recieves)
  • Brainwave analyser to monitor my many moods!

01.29.07

Nice filter for Inst. Amp

Posted in EFPD at 2:50 pm by philwinder

Just found this ECG circuit. What was of interest was the filter on the inst. amp’s reference.
index.php (PNG Image, 841×468 pixels)

Nothing found that will filter out my mains!

Posted in EFPD at 1:49 am by philwinder

Had a look round to try and find a front end filter that wont trash the input impedance.  Cant find much, but I posted a few posts on forums, so we shall see what turns up there:

here, here and here.

Phil

01.28.07

Data prediction equations

Posted in EFPD at 4:29 pm by philwinder

According to Feynmens lectures on physics (pp. 8-12), the electrostatic equations are not valid for close proximity electrtostatic forces.  This leaves the equation field wide open to essentially use what I want.  Playing with Excel found that the best (where simple) equation to use was 1/(1+2.7*(x^3)).

The graphed output of this equation looks like:

EFPD predictions

01.27.07

More thoughts, keep changing my mind!! - Inked

Posted in Projects, PIC, Robotics, ZBot at 6:27 pm by philwinder

Still havent had any time to do anything yet but:
Ive decided to run multiple IR modules off one 18F pic then:

  • I can have a proper multi-master I2C configuration which means proper interrupts.
  • The IR module will now be smaller/cheaper because of the lack of another pic
  • Could put some extra fuctions on it too, like voltage/current monitoring etc.

    • This does still mean that the I2C routines will have to be written (boaring!) since that was what my motivation was dreading before.
    Also still love the idea of creating a phased array sonar system on it, but that will come later…
    Could look for some code on the net, see if that will help/save a lot of time. Just depends how its been written…

    Phil
    Image of options

    01.23.07

    ZBot want to get something working! Inked Thoughts

    Posted in ZBot at 11:33 pm by philwinder

    Decisions:
    There is no point using some complicated I2C when you can use a simple on/off line. Although
    What about inter-IR communications?
    And it should be independent and modular?
    I think that I am going to bypass the I2C for now. Use the I2C bus as an On/Off for ALL Ir sensors to get things up and running.

    Image of hacked ZBot