[DIYbio] Fwd: [Open-rtms-list] tinkering

Date: Thu, Mar 1, 2012 at 4:37 AM
Subject: Re: [Open-rtms-list] tinkering
To: open-rtms-list@lists.sourceforge.net


Hi!

Yes, there is hardware:
http://open-rtms.sourceforge.net/roadmap.html
On the bottom of that site is the section Electronics
In the Gallery You can find a photo of the hardware I put together.

Status of the project:
Parallax Propeller:
The objects for keyboard, mouse, VGA and communication are provided by
the manufacturers.
I have written objects for graphics/text overlay and for sending out
signals on 8 channels at precisely the same time.
What is missing is the generator object for "complex signals".
Basically: What is meant by "complex signals"?
Nice-to-have would be a object to measure the resistance R and the
inductance L of a connected coil.

Control software:
I have written a class for connecting to the Propellers build-in
bootloader and uploading a program to it (and writing it to the EEPROM
also).
Works for Linux. For Windows the control of the DTR-line is missing in
the SerialPort class. This line is needed to reset the Propeller to get
it into the bootloader. I will check that out, if I start the
cross-compiling experiments.
I have written an FEM solver for magnetic fields around coils. I want to
use it to calculate the fields inside the brain.
I am also porting & integrating an old (2005) program of mine to display
tomography data. (A friend of mine got a scan of his brain on CD, when
he volunteered in some medical experiments at his university. One of
those if-I-poke-you-here-what-part-of-your-brain-gets-activated
experiments.)

Missing:
The glue in between. What is the workflow of the program? Where do I
click? What happens then?

For tDCS: I assume You want to imprint currents in the area of around 1
uA. My crude measurement of the resistance temple to temple gives around
1 MOhm. So simply take the electronics and change Rmeas to 1 MOhm. Now
the circuit should be able to imprint currents of -2.5 uA to 2.5 uA.
Possibly a little thought has to be spend on the OP-Amp selection and it
might get tricky in a multi channel setup to get all the relative
voltages right.

Am 01.03.2012 05:17, wrote James Braddock: