From: Joerg Hansmann (info_at_jhansmann.de)
Date: 2001-11-09 15:58:58
Hi,
----- Original Message -----
From: <ldean_at_metrowerks.com>
To: <buildcheapeeg_at_yahoogroups.com>
Sent: Saturday, November 03, 2001 10:42 PM
Subject: [buildcheapeeg] Building an EEG
...
> Has anyone else tried building a BrainMaster on a 68HC12?
I have only seen the schematics and the serial protocol of the bm,
but have not tried to build it. (old CPU, only 8 bit ADC, etc.)
> Second, from scanning the postings to this group, it seems that the
> RS232EEG is preferred to the BrainMaster. Can you tell me what makes
> this design superior?
the RS232EEG is obsolete now, because soon the modularEEG will
be available that has even better properties than the RS232EEG.
Some features of the modularEEG are:
(new features of the modularEEG that enhance the RS232EEG concept are
marked with +)
*all Schematics, Layouts, firmware etc. freely available under GNU/GDL License
*10 bit ADC resolution
*256 Hz sample rate
+*modular bus concept (minimum system consists of one digital-pcb and one analog-pcb with 2 EEG channels)
+*up to 6 EEG channels (with 3 analog-pcbs)
*4 digital TTL-input channels
+*driven right leg (DRL) technology for enhanced line-hum recjection
+*5th order anti-alias low-pass filter (only in hi-end version)
+*built in sweepable calibration generator
*optically isolated RS232 Interface
*AT90S4433 RISC CPU (from ATMEL)
*firmware written in C (with AVR-GCC)
*firmware flashable with freeware tool SP12 and a simple parallel-port cable
*protocol-compatible with Electric Guru EEG-feedback-software from Rob Sacks
> What would it cost to construct an EEG with
> this design?
About 600,--DM for a modularEEG with one digital and one analog pcb
(2 EEG channels) without electrodes, completely assembled and tested
in plastic cabinet.
Components cost are about 200,--DM.
At the moment a ready assembled version is not available partly due to unresolved
legal questions.
> Thanks in advance for any help.
HTH.
> If my building an EEG can in any way
> contribute to the group, please let me know. I may even be interested
> in writing software
What languages ? C++ ?
Regards,
Joerg
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