Let's Make Robots!

LadyBugBot

Inhabits my fridge's door.

Meet my robotic fridge magnet! :)

 

 

Once upon a time I was getting into my fridge for another bottle of beer, and after closing the door, my eyes stopped at little funny ladybug magnet... And I thought: "Hmmm... Why don't I build slightly bigger one, intelligent, robotic fridge magnet? :)"

LBB_compare_s.jpg

In a day or two I already had a rough design in my head and started to collect parts. Controller: Picaxe 08m (this was my first time with it, and I'm pretty happy with it! ) with CHI040 board which I found fantastically convenient for variety of purposes as well. Base: defective CD (I had couple of). Locomotion: With 08m I had no luxury of dedicating 4 pins to motor driver, so, continious rotation micro servos from DAGU cuts pins count by 2, leaving space for bumper switch, tilt sensor and piezo speaker. I went to construction store and bought a bunch of furniture magnets. One of medicine dropper parts magically had perfect size for my tires. Now, the body... Hmmm... first I was thinking of some plastic ball cut in two hemispheres, but then I came up with papier-mâché. After I tryed it out, it was so cool, so I decided to write a walkthrough.

Below is the interrior view of LBB.

LBB_inside_s.jpg

I had to hot glue 10 of my magnets to CD to have good enough magnetic force. By the way, My dead CD was LightScribe one, so I did not hesitate burning some stuff on it :)

LBB_bottom_s.jpg

The power switch fitted just fine in the CD hole. Below is picture of my board which is glued upon 3xAAA batteries taped to each other (initially I used 3xAA and battery holder, but this setup could not fight gravity :) ) which glued to servos which are in turn glued to CD base. You can see A tilt switch soldered onto board facing up. I use it to roughly determine if LadyBugBot facing up or down and use it in subroutine which makes LBB turn until facing upwards.

LBB_board_s.jpg 

Wheels and mecano parts I used to screw body onto chassis:

LBB_wheel_s.jpg

Little piezo speaker:

LBB_speaker_s.jpg

And at last, my home brew bumper switch which is actually not only bumper switch, but cavity sensor as well. Basically it consists of 2 little levers glued to 2 springs which are centered between 2 contacts. If lever goes to cavity or bumps against something - spring completes switch circuit.  It took me long time to tune it to work properly.

LBB_bumper_s.jpg  

Now, the behaivour. LBB basically roams around my fridge door and avoids cavities ie. door edges. Randomly LadyBugBot does some other actions:

  • stops for 10 seconds and produces creepy sound
  • turns left
  • turns right
  • positions itself upwards
I have some ideas for upgrading LBB in future like replacing AAA batteries by AAA accumulators + solar cells and giving it some LDRs to simulate more complex behaivour.

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I am making somthing lie this exept it will be remote controled by a (hacked) ps2 controlar and inside of an old mouse with a Picaxe 18m2 on a standered project board

Aha, old mouse body :) Sounds cool! Are you going to use magnets as well? Looking forward to see your bot on pages of LMR!

Yes I will use magnets but it will also go on the floor.

Wow! That is nice! :D LBB gets popular :)

LadyBugBot is a very nice bot indeed. A friend of mine is renovating kitchen and I just remembered seeing this lovely bot. So now I feel I must try to copy it because it would make an excellent gift.

Just finished working with papier-mâché. Time to get some sleep and give it some time to dry.

And thanks for the great bot and inspiration :-)

 

Tnanks! :) Let me know if you will have any questions, anything I could help you with.

... and do not forget to take pictures and stuff before you give it away! :D Good luck!

That is really cute, cool idea!  Strangely saw it on Make before here. : )

Another cool design from Isotope. Great job!

The bump/cavity switch is a cool innovation.

How long before Make or another site pick this one up?  ; j