Let's Make Robots!

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Hopefully pulls me round the track :)
Lumi requested that I post about this ongoing project of mine.  I am currently about half way through builing a working 3 1/2" gauge live steam locomotive.  This … Read more
Hands free! navigation from a known GPS point given a distance and bearing
I am looking at building a relativly 'hands free' GPS navigator for bush walking as a backup for magnetic compass work. Keeping track of distance and bearing in … Read more

Question - Rev counter

For this project here http://letsmakerobots.com/node/22474, I am needing a simple sensor to indicate the number of revolutions a tsecond that an axle makes.  However this will be in a dirty/oily place (under isde of carriage bogie) so I am wondering on the best method of sensor to use.  I think I have narrowed it down to three possibilites -

1/ Optical slot interupter with seperate encoding wheel.  Probably easiest option but how prone to dirt and mis reading.  Could be hard to clean.

Measures speed of a steam locomotive, monitors water level of tender tank
Problem :- Model steam locomotives do not have a speedometer, however track constraints often create speed restrictions so we need to know how fast we are going.  … Read more

Printable Arduino manual with ALL commands

Well I now have received my first arduino (duemilanova), having used PICAXEs for a few years,  but have a problem.

I do not have internet at home, where I do the programming, and cannot find a printable version of the arduino language manual (if there is one!).  I download a couple of basic 'beginners' manuals and printed them off, as well as the extended language reference.  My main problem comes in that some of the examples seem to be using commands not in the extended reference. 

 

simple avoidance robot
Using a
Well I have finally started my first bot for this site.   This is basically a re-build of a robot I made around a year ago, using the Picaxe School experimentor … Read more
Price: $8.99 USD
Sharp GP2D120    Have been looking around for IR sensors and found these at what I think is a great price - nearer to $50 in Oz! Got from Summerour Robotics - … Read more