Let's Make Robots!


So I'm new to LMR, and this is my first robot. For now, it's just an Arduino Uno, a motor driver circuit, and two motors. The motor driver circuit I got from here: … Read more


Hi y'all, just joined LMR, fantastic site, lovin' it already . . .


I am a bit of a beginner to robotics, I mean I can program and all that, and make these things, but I know not how or why they work.

One thing I have been wondering is about capacitors:

When designing a circuit, how does one know where to place capacitors, or why to have them, or how they function in that position?

With this circuit in particular (from here: http://letsmakerobots.com/node/2074), why the caps?

those two in the top-right, why do they both need to be there?

Good IR Bumpers?

Can anyone recommend any good IR transitters/ir detectors that can be ultilize for object detection. I tried using a phototransistor with an IR transmitter, but it only works when the IR transmitter and phototransistor are pointing directly at each other.

Polyplasticy goodness

Been rummaging around every local store in search for the perfect container for the M134 controls (read lunchbox)

And so after heavily customizing an ikea 'lunchable-accessories' box I happen upon one of my favorite mischellaneous electronics sites, the one where you put all the crap that really doesnt work in a shiny aerodynamic case that makes whatever whizzbang youve made look really professional, and as an added bonus make anyone operating it and not getting it to work feel like a complete idiot.

Punchable/stompable switch

Hi, guys. I remember reading somewhere (maybe LMR, maybe Make Magazine?) about a DIY way to make a sort of electrical switch that closed a circuit when it was punched or stomped. It had something to do with a layer of foam between two contacts -- maybe the foam was partially conductive or something? I'm working on a musical project that involves recreating something similar to a DDR dance pad, and I'm trying to figure out how to make the pads. Does anyone know what I'm talking about, and maybe have a link or something? Or does anyone have any ideas that might prove useful? Thanks.

I remembered that I was sweating for weeks about what should I have for a power supply circuit. However, I came accross this and all of my worries vanished. … Read more
Provides power for breadboarding, testing, etc
I was tired of wasting batteries while testing my robots and other circuits, and having to dig out voltage regulators every time I needed 5v or 12v for a circuit, … Read more

LED fun!

i think this little project would be good for your programming and electronics.

it looks like a lot of fun.