Let's Make Robots!

Complet newbie needs help with Picaxe 28x1.

I m such a newbie, please forgive me.

I have the picaxe 28x1 starter pack and i'm trying to do the "Test the System" tutorial, but im am so lost.

When it says 'connect to pin 4' i notice there are two pins side by side on #4, which pin do i actually connect to ?

do i have to connect both? Been using the pin closest to the Darlington chip, with out success.

Also there are two 'v' pins on oposite sides of the board, which one should i use? or does it matter .

What to do with a drunken sailo.. err linear slide?

Ok I was cleaning up around the work bench and found this stepper and belt linear slide assembly that came from a printer. I had kept it to knock up a cheap x/y plotter, but I scrapped that idea and am building a CNC out of better stuff. It seemed like such a waste to destroy or scavenge the motor from it so I need some ideas of what to use this for. The stroke is about 350mm if something were to be attached to the belt, but theres no reason it can`t rotate continuously for something. I also have the metal strip that was used as a slide for the opposite side.

anyone got 2 spare 47k?? and you get LEDs!!

i just got my mail today with some stuff i orderd but i have forgot to buy some 47kΩ resistors and one 380Ω

i got everything i needed for my robot eccept some 47kΩ resistors and one 380Ω and i dont want to pay $15 for shipping just for two 47kΩ and one 380Ω! 

so..      does anyone have some spare 47kΩ resistors? then please PM me! (and if anyone have some spare 380Ω resistors, then please PM me too)

i am wiling to swap with ~5 red or blue(you chose) clear(super powerfull) LEDs i have, for two 47kΩ and one 380Ω!

Switching voltage regulator but what after it ?


Here is a hopefully simple question, and a little explanation to go with it.

Okay,here we go...

I am currently adding extra sensors and bits and bobs that eat up power on my robot and I would like to give my robot a bit more power to work with and so that it can run longer. That is simple thanks to12 AA batteries

My robot uses a Picaxe 28X1 and from what I have read it doesn't like more that 12V.

Here is the problem: my 12 AA's give out  18V ( and yes I did use a calculator! ) but I can only give my chip 12 of those 18V.

Would this motor be able to lift 150 lbs?

Would this motor lift me?  150 lbs or so?




Its for my walking chair, it will be chained to a shaft and the shaft will have about 150 lbs (NOT static load) or so of force to deal with.


Thanks :)

Robot event calendar

There is a lot of robot related events around the world so why not make a Robot event calendar?
This way LMR users know were to go and show there robots and met other LMR users.
Here is a few links to start whit.

Odense robot festival 10/12 Sep. 2009 http://www.robodays.dk

DTU robocup 14/16 Apil 2009 http://www.dtu.dk/subsites/robocup.aspx

PLC languages

I want to work with siemens PLCs but there is seven kind of languages for programming it.

which one is proper for beginner?

Best for Beginners?

I am an absolute beginner... i have very little experience in electronics, very little experience in mechanics... but i am an expert programmer...  my question is: what do you recommend for a beginner wanting to get into robotics?  I am thinking I might want to get a roboduino board but I see here a lot of people are using picaxe. 

The advantages of something like the roboduino is that the board is pretty self contained and wouldn't need a seperate board to drive the servos...

Any suggestions as to what type of micro-controller might be best to start with?

female to female jumper cable search

Im in a bit of a situation at the moment. i need some female to female jumper cables but cant seem to find anywhere in the jolly old uk that sells them.
Any help would be much appreciated.
Tom J

Edit: thanks to all for your help.
ive found a site that sells them but i think ill follow mike and make them as the price is high.

Cheap Lcd for picaxe etc


I am new to LMR but for those looking for a cheap lcd I have found a brilliant one on ebay for under five pounds! It is 16x2, uses the hd44780 parallel driver, so can be used with picaxe etc, and even has a backlight!

I have just bought one but have yet to try it with a picaxe, will let you know when (or if) i get it working. Just follow the link below: