Let's Make Robots!


Listen, Talk, Move, Navigate

UPDATE 28/12/2013 VIDEO of LEDko playing... macarena http://youtu.be/632UrOgEVBg

VIDEO of LEDko playing the piano: http://youtu.be/OWzvuD2DSA0

LEDко is a robot I've been slowly building since October 2011. I consider it is my first robot I've built that looks like a robot.


  • exists 
  • reacts to voice commands
  • talks and sings
  • can move autonomously and avoid obstacles 
  • follow a line and navigate in a labyrinth
  • do things (it has two hands) 

LEDко has:

  • A Arduino Pro Mega 5V microcontroller from Sparkun
  • 10x5 LED matrix with a second ATMega328 Arduino for scanning
  • EasyVR module for voice recognition speakjet chip for voice synthesis 
  • double gearbox 50:1 
  • 2 hands with 2 servos for each 
  • 2 servos for head movements 
  • SRF05 sonar 
  • Sharp analog distance sensor 
  • 2 digital Sharp distance sensors with 10cm range (used for cliff detection) (note mounted yet) 
  • 3 IR Line sensors 
  • power form a 7.2V 2600mAh NiMH battery pack 


LEDko before

An early photo of LEDko

LEDko's homemade battery


So far LEDko is programmed to respond to various voice commands in Bulgarian (Hello!, How are you, Sing, Say Something, Left, Forward, Go, Grab ....). I've done a few videos of it speaking but I haven't uploaded the yet.

LEDко's history:

  • __.09.2011 - First drawing of LEDко
  • 05.10.2011 - First component delievery (120 LEDs)
  • __.10.2011 - The LED matrix is ready
  • 24.07.2012 - First steps (revolutions?)
  • 25.07.2012 - LEDко can navigate alone

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Did you use square leds or are the square things tiles?

They are just square LEDs.  I saw some of them in an electronics shop and I thaught they'd make a great LED matrix. Then I made a matrix and decided it could be a robot face so I built LEDko :)

Very cute, love the LED face with ultrasonic eyes. Also, are those Sugru hands? Great video, though left me wanting to see more of this guy in action. Please post more =D

Thanks! Yup, the hands have some sugru and also polymorph on the servos. I have some more videos of LEDko talking, moving and navigating, but I have to add subtitles (LEDko speaks Bulgarian) when I have the time so everybody could understand. I look forward to posting them online, as LEDko can also say jokes and sing :)

very cute )

You just made my day :-) Cute little piano playing robot....long time since we had something that funny here. Well done!!!

The little tune on the piano is freakin awesome. Good job.

Keep up the good work! :-)

That robot is wicked cool, cute, and really impressive! :D