Snail the Light Seeker

This creature roams through the surrounding environment and seeks for light sources. When an object is too close it reverses motion and turns around, and then goes on seeking light.

I used an old toy motor and platform, then added two LDR light sensors, a SHARP infrared sensor on the front and Arduino Diecimila for the brain.

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11-11-08 UPDATE:
My Snail bot is on WIRED  :)

http://lab.guilhermemartins.net/?p=308

big br0 (work in progress)

Here goes my second robot. This turns out to be the 4th robot actually  :)

I found this offroad car in an old junk and it was love at first sight!

Now I want to add some brains and sensors and give him a new life :]

The steering DCmotor burned out and I’ve removed all the gears and stuff around it. I’ve made a hole and installed a servo motor to do the steering, it seems to work out good!  I can´t post a video because the motor shield I was using burned out as well, now I’m working on a custom motor driver  …  (it seems I’m having lots of burning issues lately)  :D

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2008 – 09 – 22 —- update ———————————

My custom motor controller seems to work quite well!  These videos show the servo steering.

Baratinha (My 1st Robot)

This was my first robotic experiment, I used an arduino and a motor shield with one servo for steering and a small dc motor for traction.

I didn’t have any cool sensors like infrared or ultrasonic at the moment, so I used two micro-switches to be like bug sensors. And I called it “baratinha”, a Portuguese word for “little cockroach”.

Recently I found that this project is featured in ladyada´s ranting !
And also on MAKE blog !

I´m so proud of my little Baratinha!!  :]               Thanks to João Silva for putting me up-to-date!

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I thought this was a finished project… I was wrong!! :]
I’ve decided to change the structure and the geometry of the chassis. Now the gravity center is lower, which performs more stability. I’ve decided to remove the other power switches and put these smaller ones, one below the other, so that I can switch on all the system at once. And now about the ultrasonic sensor :)
I’m programming the navigation system, and it’s being another challenge for me! But I’m having lots of fun with it!!
I’ll be out for one week so see you soon guys! ;)

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Just a final note: I thought that if I created a blog post and assigned it to my robot project it would appear in this page.. but it didn’t.. so, I’ll update only this page from now on..

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1 week later.. :)

I´m closing this project because the motor that I’m using is very weak and it doesn’t have enough strength to run with all that stuff. I’ll make a similar one with a stronger motor and bigger wheels, and with a better understanding of robot design!

It was a good way to start and I’ve learned a lot about hand crafts, physical construction, materials and programming. :)

I started this robot without any planning at all, I was just adding more and more stuff, and when a problem was solved, another problem was created, so this resulted very time consuming. It was something like adding something here and something there, then I didn´t liked it there so changed it… Now I must fix this because I’m thinking about a new way of doing it… so it was like a never ending project  :)

The main purpose here was to build something, to understand how work some materials, like hot glue,  and to program an interaction system.

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The main purpose here was to build something, understand how some materials work like hot glue, and program an interaction system.