Let's Make Robots!
Computer mice with balls contain two (or sometimes three, if the have a scroll wheel) rotary position sensors. These are not mechanical switches, but optical ones. … Read more
Price: $15 USD

 Collected by one member
I just found this on HobbyEngineering.com and thought you might like it. I've read a few tutorials on how servo's can be made to rotate indefinately, and rather … Read more
Trust me; You REALLY want these. Really. They come in other lenghts as well. Uh, so nice to have. So nice!! Uh - forgot to ad shop, link: Here it is, compare price, … Read more
Can be bought online here - but may be cheaper to get in your local electronics store Good tutorial: read more and see pictures here Read more
Accelerometers are very exciting little things. When I say "little", I mean it, as they usuallyfits 4 or more on a finger nail! And each typically has some 7-20 … Read more
Price: $0 USD
I don't know how it is in other countries than Denmark regarding this. But in Denmark you can just walk into any shop / supermarket that sells paint, and grab as … Read more
Price: $3 USD
Relays are an alternative to motor-controllers. They do consume a little power from your battery when in either on or off position (turned on) - but they also do … Read more
Price: $9 USD
Pack of 25 rack gears. Unfortunately it doesn't look like Rapid will ship outside of the UK and I really need some rack gears for the cap launcher. They allow a … Read more
Price: $19.95 USD
The pololu dual serial controller is a great component to controll more than 1 motor. It uses a single seraial cable from a microcontroller to control the motors. I … Read more

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Nice litle set of belt-tracks. Kinda cute! http://www.solarbotics.com/products/gmtpkg/ Price is for a pair! You will need to sort out how to mount the 2 axels … Read more
i bought in to this deal - and it really is the most funny set of motor & wheel I have encountered so far: http://www.solarbotics.com/products/gm10w_deal/ Cool … Read more
I bought some small tilt-sensors. basicly they where a small metal capsule with a ball inside. When tilted, the contact was switched on/off. I thought this was … Read more
IMHO the best way to have your robot measure distance to objects. Fast and accurate. If you are using Picaxe, you may find this info useful: … Read more