[Pharo-project] Pharo and an old plotter

Pavel Krivanek pavel.krivanek at gmail.com
Thu Mar 22 10:52:38 EDT 2012

The plotter needs only 6 pins (gnd, pen, axe, direction, step, ready)
so it can be controlled directly via LPT. I firstly successfully tried
a windows machine with a parallel port.

For USB connection I used Arduino with serial communication where
Arduino accepts simple basic commands and when it's done it sends a
message to get the next ones. It's on Linux with latest CogVM but I
had to create symlink from /dev/ttyUSB0 to /dev/ttySx and open the
port by number (x), not by the name. See

-- Pavel

On Thu, Mar 22, 2012 at 2:56 PM, Schwab,Wilhelm K <bschwab at anest.ufl.edu> wrote:
> Nice!  What is the physical/electrical connection?  Serial, parallel, etc.?  If serial, did you have any problems with opening ports?  On which VM?
> Bill
> ________________________________________
> From: pharo-project-bounces at lists.gforge.inria.fr [pharo-project-bounces at lists.gforge.inria.fr] on behalf of Pavel Krivanek [pavel.krivanek at gmail.com]
> Sent: Thursday, March 22, 2012 9:47 AM
> To: Pharo Development
> Subject: [Pharo-project] Pharo and an old plotter
> Hi,
> I would like to mention one funny usage of Pharo. I have got an old
> simple czech plotter from 1989 named XY4150. It is no secret that the
> interactive environment of Smalltalk is ideal for controlling such
> machines because it is very easy to send commands to it and experiment
> with drawing capabilities.
> Even today such old hardware can find a real-life production
> deployment. I currently use it to write owner names to plastic cards
> with pre-printed bar codes by a special pen destined to sign credit
> cards :-)
> It is controlled by Arduino however LPT can be used too.
> Btw. there was several interesting czech plotters. The most
> interesting one was named Merkur Alfi. It was a construction set for
> children with two stepper motors and one relay.
> http://www.youtube.com/watch?v=yUmFYzyL9eo
> And they started to sell it recently again so if you are looking for
> some cool hardware for your children, you can look here:
> http://www.merkurtoys.cz/vyrobky/plotrovy-zapisovac-alfi-z-merkuru[1]
> But it's about 139€ so it's quite expensive...
> Cheers,
> -- Pavel

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