Let's Make Robots!

electronics

Scroll the text without using any controllers or other components on the matrix except the arduino/picaxe and the matrix, and ya dont forget the current limiting … Read more

Vex Electronics

This is just a tip (which I learned today through others on this site, thanks guys)

All Vex electronics are self regulated.

Which means that even though they say you must use their battery's, you can run any battery between 6v and 12v without drama.

 

For example, I'm running a 12v nimh 5000 pack on my robot with a regular Molex/Tamiya connector.

http://letsmakerobots.com/node/27575

 

A Complete Design and install solution of mechanical, hardware, electronics, plastic injection, installation and software. 4,250 pixels under glass floor, interactive using real time Vision analysis. Plays Videos. 20 Meters x 5 Meters. R&D and implementation of a suitable Image Processing Pipeline of Fisheye Transform, Affine, Population Threshold, Crop, Blob Size Filter, Smooth Hull, Blob Tracking and Replace of Blobs and show of statistics
An interactive floor uplit with 4,250 pixels, 20 Meters x 5 Meters. Capable of playing Video or doing Vision Tracking Interactive using real time Vision … Read more

Reuseum, store.reuseum.com

Hi there all,

I'm building an online store for the surplus technology company, the Reuseum, and would greatly appreciate feedback regarding making it better and stocking useful things. We have lots of components and such, odd bits of tech and other randoms. Your help is greatly appreciated and if you do decide that you would like to buy something from store.reuseum.com, let me know you are from LMR and I'll stash some cool extra goodies for ya.

Regards,

David

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

Capacitors

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.

Tayda?

Hi,

Anyone have experience (good or bad) with Tayda electronics? Please share.

I just googled this one part and Tayda came up as the absolute winner on price. Who would like to teach me how to order small quantities from suppliers far far away. Any caveats, consumer traps, unusual conditions, broken promises?

Parallax Board of Education board + extras

This is a collection of items to make up a complete Parallax Board of Education training kit. The Basic stamp is a new BS2P processor which is faster, more memory and comands then the original Basic Stamp2. It retails for $79.99. The board is in mint condition (only used a few times) and tested before listing. Everything else is new except the USB cable I used with my camera a few times. Parallax retail value of over $190, not counting the cable and un-opened bag of electronic parts that go with the book.

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.

Other electronics (not necessarily robotic)

A place for the discussion TofuRobot brought up regarding other electronic projects. Instead of being lost to the shoutbox nether regions,here's a screenshot of the beginning.

shoutbox-electronics-section.png

Personally, I think tip/walkthrough would be the right place for stuff that can also apply to robotics. Non-robotics (like the carduino example) would go in a blog.

 

Another great idea that I didn't have

The Arduino Experimentation Kit (from oomlout) is a pretty damn slick thing. Usually I'm one of the shit talkers about Oomlout's stuff (they think a lot of their laser cut plastic). This thing isn't quite as pricey as I'd expect from them though. At 80 USD it _might_ actually be worth buying the kit instead of ordering parts from different places (and then paying multiple shipping charges).

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.