🚀 go-pugleaf

------------------------- Original Article -------------------------
Path: news.univie.ac.at!paladin.american.edu!europa.asd.contel.com!uunet!munnari
From: 9125113g@lux.latrobe.edu.au (Mitch Davis)
Newsgroups: comp.lang.logo
Subject: Re: Robot Turtle...(Terapin Turtle)...need info...
Message-ID: <1992Jul28.025555.13248@lugb.latrobe.edu.au>
Date: 28 Jul 92 02:55:55 GMT
References: <Bs155M.IAw@DMI.USherb.CA> <150lpeINNh0h@agate.berkeley.edu> <MAX.92
Sender: news@lugb.latrobe.edu.au (USENET News System)
Organization: La Trobe University
Lines: 27

In article <MAX.92Jul27135405@Kolmogorov.gac.edu> Max Hailperin <max@nic.gac.edu
>   ....  Also, the Lego-Logo people publish
>   plans for a build-it-yourself turtle out of Lego.
>
>As a warning, the Lego turtle is a bit disapointing once you've gotten
>used to screen turtles or higher-tech robot turtles.  I've been using
>it (not with Logo, with Scheme, but that is irrelevant) and it is
>frustrating trying to calibrate how many seconds of turning for angles
>of various measures, or even getting the forward/backward motion
>reliable.  The design is completely open-loop -- there is no
>"odometry" to measure how far the wheels actually turn, so you just
>have to go by the times.  Closed curves rarely close, etc.  Another
>limitation is that there is no pen up/down effector, so the pen is
>always down (or always up -- you choose).

I used a lego robot on a BBC using BBC Logo in 1988.  The robot featured
shaft-encdoding as it's odometry, and quite a nice set of LOGO primitives.

It was quite accurate (especially if you ramped the speed up and down so
it didn't slip) and came with a beautiful breakout box with which you
could view all the inputs, outputs, etc, and a big red master switch for
disconnecting output.  A good habit to get into.

Now maybe there's more than one Lego robot, but the one I got to use was
a real pleasure, and has provided lasting memories.

Mitch.
are you sure the BBC turtle was lego? i know BBC did a fischertechnik
turtle aroubnd
          nd the same time.
fischertechnik is a construction kit which is mechanically
much more reliable than lego
fischertechnik is selling two basic kits with a parallel port interface,
and i implemented the necessary logo copntrol wwords for IBM LOGO.
documentation is existing, but minimal. i can post it if there is demand,
t is freeware.