Let's Make Robots!

encoders

High speed omni directional robot ideal for soccer bots
Using a
Now with video, Scamper appears to be a little wobbly at slow speeds but that is because at only 6%, the motors are constantly stalling and restarting. Once the … Read more

Wild Thumper 6WD & Encoders

Hi all!

I'm the owner of Wild Thumper 6WD without encoders. It's really hard to get WT 6WD with encoders or motors for that platform with encoders at the place I live in. So I have to solve this problem in different way. Could you help me with my questions?

1) In basic model of 6WD with encoders on which axis encoders are installed?

2) Does it make sense to put encoders on all six wheels?

Pushing the limits with encoders

This is now a tutorial and can be found here: http://letsmakerobots.com/node/39098

I've been working on some code so that a simple Mini Driver using a lowly ATmega8A can drive two motors with encoders and 8 servos. This may not sound hard at first until you remember that the Servo library kills PWM on the ATmega8. To make matters worse, D2 and D3 are the external interrupt pins but we need them for driving the servos.

Simple kit robot platform to start learning about robotics.
Using a
Our goal is to learn about robotics and programming as part of our homeschool lessons.  We decided to use kits to help get us up and running faster and get into … Read more

Our First Robot - Build Day 2

Introduction

Well after some sleep we got back to work on what we thought we could accomplish without getting a headache.

Afternoon

 


Screw Shield

 

Our First Robot - Build Day 1

Introduction

Ever since we purchased our Arduino and tinkered around with a few simple electronics projects, we been itching to make a real robot.  Well the time has come where we had a few extra dollars to spend and we splurged and purchased the following to help us along:

Update April 1st   Well the dust has cleared and I have finished and submitted my Google Science Fair project and I very happy with it.  I have added the site … Read more

Area mapping

I have (that is relative because I have not yet ordered my first parts from Robotshop) a PING ultrasonic sensor. I'll be having an arduino mini - though I'll no doubt buy something bigger after - and I wonder if I can efficiently make my upcoming rover (differentially driven, nothing special really) map it's surrounding area using a grid. Is it possible or will I run short on memory with the arduino mini? And more importantly, I need help with the code (I have 0 experience with code, though I have enough theory I guess...). Any suggestions are appreciated.

DIY encoders for tamiya dual gearbox

Hi, Want to add encoders to my tamiya dual gearbox, since i'm using bulky opto switches, i have easy access to a gear that rotates 7 times per revolution of the wheel, i thought of making 4 holes on that gear(in a north, south, east, west orientation), reckon 28 pulses per rotation will be enough?

Back in business

It's been quite a while since I've been active on LMR. I have been working a lot on Java programming instead of my robots, but now I'm back with new ideas for my "Robot Hansen" robot who will get a serious upgrade from his current picaxe 40x1 chip: He will have a LEGO NXT controller as main brain, a cmucam3 for vision, several ATtiny26 based sensors and actuators. All this because he will probably be going to DTU Robocup 2010.

Encoders for servo mounted wheels

Picture_004.jpg
 
 
I have 2 questions, 
 
- First, when using a C-stamp (programmed using MPlab) is it possible to track the movement of a continus rotating servo so that I dont need to add encoders to know how  much the wheel has turned?  
 
This is an example of coding that makes 2 servos turn(if it helps):
 
void goforth(BYTE lp, BYTE rp, WORD t)
{
  WORD i;
Dead reckoning, line following, maze solving
Using a
I'm building this fast robot for the upcomping LVbots mini-competition, which will include dead-reckoning and looped maze-solving contests.  I'm using: Read more

Robot guitar amplifier

OK, here's what I'd like to achieve: I want to "robotize" my guitar amp so that I can record and recall each potentiometer's positions (i.e. volume, tone, reverb, etc.).

Why is that? Because I don't want digital voltage controllers to interfere with the signal path within the tube amp, hence the need for a mechanical actuators for each potentiometer.

I already have some designs in mind, but I would like to know what kind of parts I should get (i.e. what kind of servo, what kind of optical shaft encoder).

I'm looking forward to read your advices

 

Working with encoders

I just got my BaneBot 36mm encoders(pdf) all hook up and calibrated yet I am not fully sure how to work with the A/B signal lines.

I am trying to solve the issue of not being able to run a straight line, or compensate for mechanical imperfections, etc.

Any help getting started would be huge!

Encoders, what are they ?

So what is the difference between a motor with an encoder and one without?

i think it kinds of read how much the motor is rotating, but can't i see that from how much current i'm giving? what are the uses for these encoders?