Let's Make Robots!

8 volt from 12 volt battery

Hello, i have a wireless camera that wants 8 (or 9) volt input. That's a little weird i think.. Anyway, i have a 12 volt battery, is there a way i can get the 8 volt?

I have a spare 3V regulator and a 5V regulator (the classic L7805 something). Is there a way i can use them together to get the 8 volt?

Schematics appreciated :)


Dremel cutting and engraving :P

So i finally purchased my dremel, and made some tests of both cutting and engraving. I havent used cutting disks yet, only the cutting tip.

The first thing i have to say is: man that thing is dangerous :) Use some safety goggles if you have to use it! The second thing is that it takes a while to get hand with it. At first it just keeps going crazy and shooting particles of stuff around, with a particular aim for your eyes and face :P After some test i managed to make an almost straight line, and then i had some fun engraving stuff :P

Small motor controller/driver with variable speed

Hello, i'd like to have some small driver/controller like the L293D or similar, but that can run motors at variable speed. Does it exists ? A small and cheap board would be ok.

If it doesn't, how could it be built ?


Thanks :P

Official Arduino Ethernet Shield is out :P

I want one so badly! :P

Where can one buy it ? 


incredible hovercraft carpet

I just found this around.. could it be true? :)


realistically feasible weapons

We have many robots in this site, but none of them seem to have weapons. Why? Probably becouse it's hard to design something useful in the small package of our robots.

so, anyone ever tried something? i was considering some kind of shooting gun, either with compressed air or spring loaded. Nothing too powerful, just enought to dissuade cats :)

I have seen this stuff, looks interesting:


Xbee modules

hello! anyone of you ever used one (well, two) of those modules? I'm interested but there are many version to choose among.. Any experience to share ?

Also, is the XBee USB exporer enought on itself to connect an xbee to a pc ? looks like a good solution for the pc side.

Cat dissuasor: blender defender :P

I've ended up in this page today, it's too funny :P It has cats, lols and electronics :)

Basically, a guy built a system that detect when the cat jump in the kitchen table, and scares the hell out of him with a combo of blender noise and strobo lights :P

The short clips are delicious (the last one expecially, made me ROTFL), and there are also details on the implementation!


Google sketch-up: entering absolute coordinate

ok, i'm trying again with sketch up

now, i want to move an object to an exact location, x,y,z. not just moving it around with the mouse.

how do you do? i read the guide and it says something like entering [x',y',z'] on the value box, but i have a problem with this: for making the brakets [] i have to press the alt button, that automatically interrupts the command so i'm unable to move.

Also, how do you see the exact coordinates an object is ?


So here we are :) I decided to try and build the holy grail of robotics hobbist: a self balancing robot. I've made some research around and i've come to the … Read more