Pololu Blog (Page 33)

Welcome to the Pololu Blog, where we provide updates about what we and our customers are doing and thinking about. This blog used to be Pololu president Jan Malášek’s Engage Your Brain blog; you can view just those posts here.

Why we don't have comments on our product pages

Posted by Jan on 25 January 2011
Why we don't have comments on our product pages

A customer recently wrote: “I think you really need to add comments from users under each product (like sparkfun does). Makes it easy to review good/bad about a project and ask a question not in docs.” I rejected the idea when some of our developers pushed for comments on our web site a few years ago, and upon reconsideration, I am still firm in my opposition. Continued…

Gettin' all up in your servos

Posted by Jan on 21 January 2011
Gettin' all up in your servos

Having introduced servos and their role in a typical hobby radio control application, I will now focus on the servo itself: its parts, what is inside, and a bit of how it works. We will look at a few different servos along the way to better understand what servos have in common and how they differ. Continued…

Introduction to servos

Posted by Jan on 14 January 2011
Introduction to servos

Hobby servos are small, modular actuators developed by the radio control (RC) hobby industry for remote manipulation of everything from miniature boat rudders and car steering linkages to model airplane flaps and toy parachutist release mechanisms. The RC market is large and competitive, which has led to a proliferation of servos that have been optimized for characteristics including size, speed, torque, and price. This modularity, variety, ubiquity and cost-effectiveness of servos make them attractive generic actuators for small robots and other electromechanical systems. Continued…

One-Million-Color Flashlight

Posted by Ryan on 10 January 2011

Two ShiftBrites controlled by Mini Maestros power a flashlight capable of displaying one million colors with many interesting modes of operation. For more details, see Reed Kimble’s forum post: My Absurd Project – The One-Million-Color Flashlight!.

Baby Orangutan Hand-Held Tic-Tac-Toe

Posted by Ryan on 10 January 2011

This hand-held Tic-Tac-Toe game is powered by a Pololu adjustable boost regulator and controlled with a Pololu Baby Orangutan B-328.

Featured link: http://forum.pololu.com/viewtopic.php?f=2&t=2782

Introduction to an introduction to servos

Posted by Jan on 7 January 2011
Introduction to an introduction to servos

My last post about force and torque got kind of long, prompting some suggestions that I break it up into two separate posts. I didn’t do it because my sentiments about units and the common confusion of weight and mass applied to both topics. I want to move on to a thorough discussion of hobby servos, which is broad enough of a topic that it definitely merits a breakdown into multiple posts. That got me thinking about the order in which to present the material. So, this post is mostly about organizing and presenting information and not really about servos. Continued…

Force and torque

Posted by Jan on 31 December 2010
Force and torque

I got a few private requests for more information about torque after my post on units, and since torque is relevant to the next few posts I want to make about servos, I’ll try to explain torque a bit more today. Torque is intimately connected to force, so we’ll start with a review of Newton’s laws of motion. You should know some basic calculus to really understand these concepts, but getting into that is beyond the scope of this post; I hope I hit the right level of simplification to provide some useful knowledge to those who have some basic intuitive mechanical sense but have not taken, or have forgotten, basic physics courses. Continued…

Baby Orangutan Useless Machine

Posted by Ryan on 27 December 2010

This video shows a “Useless Machine” controlled by a Baby Orangutan. It counts how many times the button is pressed, and then the arm comes out and presses the button the same number of times. The author has also posted source code for the project.

More LEDs

Posted by Jan on 23 December 2010
More LEDs

With Christmas just a few days away, and having just discussed a single LED circuit and simple parallel circuits, I’d like to make a few comments about using multiple LEDs. I’m still talking about basic LEDs, and not too many of them; for specialized LEDs or large arrays, there are all kinds of chips designed just for that. Continued…

Otimização Do Algoritmo De Maze Solver Para O Robô Pololu 3pi

Posted by Ben on 20 December 2010
Otimização Do Algoritmo De Maze Solver Para O Robô Pololu 3pi

Customer Ana Paula Almeida wrote this Portuguese-language paper about the 3pi Robot (1MB doc) as part of a Master’s program in Computational Modeling and Industrial Technology. The paper describes the 3pi in general and specifically how to write optimized maze-solving code.