Let's Make Robots!
Navigate around via ultrasound, play tunes while flashing some LEDs
Using a
UPDATE: October 21st, '12: Added third test video shot at night and one pic. Uploaded code. Building up to a summary; the bot is almost done.Introduction: Nobody … Read more
Follow you around, generate noise and lights, make subtle suggestions.
Using a
UPDATE Oct. 12, '12: Added code snippet per YouTube request, small written progress update, no visuals, sorry.  Read more

USB cable/connector preference?

I wanted to ask the population if there is a certain USB connector you prefer to see on your equipment. Maybe it's because you have a thousand cables of that type or maybe you like the form factor. Whatever it is I'd like to hear all thoughts. For those not versed in the different types of USB connectors here's a pic for you:

Create blocks of pleasing pulsating colors.
Intro: Sept. 23rd, 2012 - My buddy Mat Nix wanted a light display that would respond to people moving about a room. Something like a wall of little frosted windows … Read more

ST's new STM32F0 Discovery Board

I do believe I have one of these coming to me and wanted to know if any LMRtians have gotten their paws on one yet. ST appears to be trying to bring the cheap 8-bit world and fancy-pants 32-bit worlds closer together with this unit. This board is certainly cheap (~$7.99 I read) or free if you register and request a sample.

SOMO 14D (WTV020-SD-16P) and MDfly MOL-AU5121 (Tenda TDB380) sound module comparison

The 4D System's SOMO-4D and the MDfly AU5121S are sound playback modules that allow you to add audio to your projects. I've used both and find both are excellent in terms of sound quality vs. price point. Each one is slightly different and has their good and bad points. I will attempt to give the reader a summary of each and provide information that I had to travel the web for to compile myself. Although anyone can find the same info I thought it handy to provide it in one tidy place.

Driving an L293 with one I/O pin?

There's the circuit, here's the plan...

I remember the remote control cars from yesteryear (the ones connected to the controller with a wire!). They had a joystick that just went forwards and backwards. When pushed forward the car would drive forward in a straight line. When pushed back, the car would back up while turning. There was no real directional control. I'm trying to acheive a similar level of control with this circuit. The idea is:

How to choose a DC motor for your robot

The question "Which motors do I need?" is a constantly recurring question. I've seen simple answers like, "You need a gear motor" and "Go for a high gear ratio" but these are inadequate for calculations. Given the usual voltages, motor drivers, wheels, and speeds used you can be somewhat general about things but trial and error can be inconvenient and expensive. I thought I'd post this attached .pdf that seems to be a lesson plan from Gear Educational Systems that covers motor selection.