Newsgroups: comp.robotics
Path: brunix!sgiblab!spool.mu.edu!howland.reston.ans.net!europa.eng.gtefsd.com!uunet!nwnexus!seanews!dmauch
From: dmauch@seanews.akita.com (Daniel R. Mauch)
Subject: 68HC11
Organization: SEANEWS - Seattle Public Access News + Mail
Date: Sat, 18 Sep 1993 15:08:27 GMT
Message-ID: <swV30B2w165w@seanews.akita.com>
Sender: _dmauch@seanews.akita.com
Lines: 35

The Seattle Robotic Society has several members that have been using 
68HC11A1 microcontrollers for various porjects. Karl Lunt, the president 
of SRS has been writing several articles on robots for Nuts and Volts 
magazine. The 68HC11 micro controller seems to be an excellent robot 
brain. Recently Marvin Green of the Portland (or) Robotic Society (PARTS) 
cam up with a beautiful single chip design using the 68HC11. His printed 
circuit board measures 2X2 inches and has only the 52 pin PLCC, a xtal 
three resistors 4 caps, 1 -20 pin input output header, 4 servo headers 
and various other headers for connection to the power supply and serial 
port. The complete design in on PLYON BBS 206-633-2905 (Over 10 megs of 
robotic stuff) under the library called robotics and the file name is 
6811new.job. It can be viewed using PADS software. This is a very compact 
yet powerful design. Marvin and I have colaborated in making his design 
available to all. I have my own homemade CNC machine and Photoresist 
setup to make near commercial quality Printed circuit boards. 
        Marvin can modem me his design. In a matter of minutes I can get 
a transparancy made using my HP laser printer. Then I use the NC drill 
epsilon file generated by Pads, convert it using specialized software and 
can start drilling the holes within 10 minutes after I receive the file. 
The transparancy is then placed over the predrilled sensitized PC board 
and exposed to UV. 6 minutes later the board is developed which takes 30 
seconds. Last it is put into the freeic cloride etch tank and in ten 
minutes I have a near perfect board with crisp traces.
 These boards sure beat the snot out of wirewrapping or point to point 
soldering. Marvin has put his design into Public domain and has 
authorized me to sell PC boards using his design. If there is sufficient 
interest. I may be willing to make a run of these boards at about $5 
each. I'm sure you'll feel the price is right for a board of this 
quality.
        In any case, If you are a 68HC11 fan besure you look at Pylon BBS 
and look at Marvin's design. It's terrific.

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