Let's Make Robots!

Recently Collected Posts

Doing 2 things at once is pretty easy!  This video tutorial goes over simultaneous multitasking on the Propeller.  My other tutorials (including my written … Read more
How to make polymorph sheets, brackets and a link to making rods. So far I've worked out how to make flat sheets with a smooth glass like finish and from those … Read more
Uses an analog input pin to capture a digital signal from a 3V sensor for use with a 5V microprocessor
I recently purchased a Parallax PIR Motion Detector from Radio Shack. These devices are only about $10 US, and do a nice job of general motion detection when your … Read more

Hondas new balancing personal transport.

Apparently its insides is a big secret but if you look closely you can see the machine actually moving sideways as it keeps balance.

I don`t know about you guys but as soon as I saw it I wanted to pull it apart to find out how it works, or at least turn it upside down and take a look at the bottom.

Picaxe 28X1 firmware A.4 has a bug, get a replacement.

As discovered by members of LMR, there is a bug in one version of one kind of Picaxe.

Phil and Limpa described their problems in two different nodes on the site. This thread aims to bring all info together, so we can write a walk through about it.

 


Phil wrote:

 

Recognising Buggy Version: 

An update to the Duemilanove
Using a
I started with the Propeller, but I've also used the PICaxe and played with AVR's and PIC's. With the release of the Arduino Uno, I thought it would be a good … Read more

CtC First Square Drawn with Little Bot

Yup, my "little bot" is up and running and has drawn his first square.  I am quite happy with the encoders and the absolute centering of the pen. I do think I need to do a bit more balancing of the motors (during the straight runs) and a bit more tidying up in general, but we are on the right track. Next on the list is to get my new lipo's installed (when they get here from China) and a servo to "pen-up" and "pen-down". From there, I would like to write a Processing program to allow me to draw a picture on the screen and send it off to the robot to draw.

 

I have some robots and robot parts looking for a good home. I want to give as many as possible a chance to win but I want entertaining video for everyone. There is … Read more

Break a leg, Wild Thumper!

I experimented a bit with video. The weather was perfect for it, as reported earlier.

One laptop with webcam streaming live from my balcony to ustream.tv. And my little 10fps camera on board. Then fool around until the batteries run dry.

Afterwards I found a problem in one of thumper's "legs". It limped. Exploratory surgery confirmed the great fear: a gear is missing some teeth. Oh well, we'll always have the photos.

This robot is navigates by (avoiding) wall and cliff. It moves around the floor, vacuuming it.
Using a
As my first microcontroller robot, I have made a two-wheeled robot with bumper switches and edge-detction (because I have death-causing cliffs in my house). The … Read more
This machine is controlled by a PicAxe Microcontroller. A servo (used for steering in R/C cars) is used to tilt the track for a ball to roll round. The degree of … Read more
Locates fires and puts them out.
Using a
SplatBot MKIII is my first attempt at a fire fighting robot. The "Wild Thumper" 6WD chassis is the production version of my original 6WD chassis and the new flame … Read more
I wanted to make a small Arduino robot using an original Duemilanove and the Robot Builder's Shield. But I also wanted to have a chassis plate so I can mount the … Read more

Bring Back the Challenges

As you all looked at LMRs home ribbon some new things have been added. However, SOMETHING IS MISSING. take a guess. If you guess challenges you are correct. What ever happened to that? Why did they take it away? Who knows. I think the challenged brung out the true creativity that makes this sight AMAZING! Sure the prizes where nice, but nothing beat the thrill of either winning or judging other peoples robots. Should they bring the challenges back? Give me your thoughts.

Optical Encoder giving variety of results

Hello,
I have a QRB 1114 and have done a little experimenting with electrical tape on my wheels.  I "thought" that I had this working before in a different setup, but maybe it was not working "correctly" before.

making Rover using Faulhaber 24V BLDC and ATxmega128/256. Wireless Communication using xbee. Main host CPU running windows 7 with custom developing application in … Read more
Ever needed a new texture or unusual form for your robotic creation........ .... Look no further and follow this Guide.     NonSream Videos :- PolyMorph workshop … Read more

Pong

Do you remember when you were a kid, and you spent your time playing pong? Neither do I. But why not bring it back? Yes a portable pong game. 

So i set out on my quest...

After some decisions, i decided i would make a pong game using 6 LED matrices, 6 MAX7219CNG, 2 potentiometers + KNOBS!!, and some custom PCBs. So here is where i am at so far, just have a collection of parts but im working on it, still waiting for the PCBs to arrive. 

 

[Update October 17, 2010] Preliminary videos added. [Update October 24, 2010] Robot Rally video added. Read more

Walter's new Navigation System (May I / Can I Go)

So here we go... I have been sick of "regular" navigation for quite a while now (more than a year now). The whole idea of "just keep going and if there is something there, react to it" is just not doing it for me any more. For the last year or so, I have been thinking about and working on a new system of "may I go". The theory is basic: Before you start going somewhere, check that there is somewhere to go! In the system I am using now, a 180 degree scan is performed and the sonar readings and angle is sent to processing.

I have now finished my wiimote project.This remote is now a USB-ready remote to be plugged into and talk to Processing or any other software running on my lappy. In … Read more

Glen the Stove, Picaxe, Processing, Twitter and Thermsistors...

Yup, I got the Twitter-stove project done. The video is pretty self-explainatory and code is available upon request.

Glen the Stove on Twitter

Heat Tracking Robot Arm/Head

Ok, I have been wondering if it would be possibly to build a robot head or arm that tracks thermal energy. You know how there are special thermal cameras that show areas of higher temperatures in different colors? I'm guessing those are pretty expensive, so would there be a simpler and cheaper way of building a thermal sensor? I was thinking of PIR sensors, but they can't really sense how hot something is, just if what its looking at is hotter than average.

Software PWM

I was hoping to avoid wrighting my own software pwm for the pic but it looks like i've arrived there.  the motors and tracks I hot glued toghther don't drive straigh so the only way I can think of fixing it is to use PWM to slow down one motor.  I know I could use the one hardware pwm to slow down just one motor but thats going to be used in the future for somthing else so I have to create the pwm myself in software.

Moves fingers, flips off everybody, plays my midi controller
Using a
  I always wanted to make something that is not too hard, yet looks cool. Not long ago I saw Gareth's post about an Arduino Hand … Read more

Geared up Servo

Ok, thanx to Ignoblegnome idea I have done my 360° servo

First i started cutting pieces of PVC, i took a bunch of screw and nuts in order to build the frame for my superservo...

but suddenly Gareth appears in my mind and say: "Use the polymorph Luke..." :O

yeah right, very easy, 10 minutes of work and it's done, very sturdy and precice.

 

Now i can sweep my sensor in 360° :D

Avoids obstacles, follow the line and solves mazes
Using a
<added basic Maze Solving video> <added wii nunchuk control video> <added line following video> Read more

minimum torque for 20 kg robot (53pound)

I'm wondering if the tracked robot I'm building will have enough torque...
It weighs 20kg( really max)
wheels radius (wheels and tracks) 4.5cm  1.8in
I have 2 motors giving 2000 rpm, 0.2n.M 28.3in-ozf
I wanted to use a 1:1 ratio for doing speed, and a 2:1 for climbing. max speed at 1:1 about 20kmh, 12mph.

Arduino Shield for building robots

I've been asked by a few people from different places if there is a simple way to use an Arduino to build robots. I explained there are ready made boards like Roboduino, Romeo, Motoruino, etc. that can be used. Or a custom compatible board. I told them that I went both ways, mostly because Roboduino doesn't have an H-bridge onboard, so I designed my own customizable board, R-Dev-Ino. Usually people are puzzled with all that information, as they have heard about Arduino, some have used it in art projects or so, but did not hear about the other variants. Seems complicated...

Using Xbee for wireless program uploads and debugging with picaxe

Xbee_attempt_1.jpg

I have recently tried to use my Xbee modules to perform wireless downloads and debugging for Mr. Tidy but have had no luck.

The Xbee is a 3.3V device so I have translated the voltages ok. The Xbee manual states that by default the modules work transparently. BUT it also states that the idle state should be high, picaxe wants a low idle state so perhaps I just need to invert the signals. The next problem then is do I invert on the PC side as well??