Page 1 of 2 12 LastLast
Results 1 to 10 of 17

Thread: The Bratinator Project

  1. #1

    Honorablemention The Bratinator Project

    Here is my project submission:

    I have always wanted to build my own biped robot ever since I saw the Honda robot. My biped uses 3deg. of freedom per leg and is equipped with fully functioning arms and grippers. What's unique about this project; the billet aluminum head that I designed and had custom machined. Like the arms and gripper, the head was designed to be fully functional as well. For example, the eye sockets are 16.3mm I.D. so I can mount Parallax's PING sensors in the head chassis. I have done this already by desoldering the sensors from the board using lengths of 26 gauge wires to resolder the sensors back to the board, which allows me to mount the sensor board in any location I choose. It worked fine, however, there was interference with the bridge of the nose. To fix this problem, I need to machine custom tubes to evenly shroud the sensors.


    The aluminum head also has the following features:

    - 10mm holes on each side to mount two electret microphones for sensing sound in its

    Software testing of the ears:

    Lexan Servo Bracket, custom designed and laser cut. Thanks Lynxmotion.

    Video showing sound sensing and SpeakJet working together:

    - 36mm mylar speaker pocket designed to mount a speaker in the underside of the head

    The custom Robotic sensor board that controls sound sensors, PING, SpeakJet, and memsic tilt sensor. Unfortunately, this board was toasted due to my carelessness. I reversed polarity on the power leads and a new board needs to be built.

    Now for the videos:

    Last edited by SN96; 02-24-2008 at 09:21 AM.

  2. #2
    Join Date
    Jan 2008
    Norway, Stavanger
    Rep Power

    Re: The Bratinator Project


    Nice work with your scull! I loved the part when he turned on his red eyes in your last movie.

  3. #3
    Join Date
    Sep 2006
    Carol Stream, Illinois
    Rep Power

    Re: The Bratinator Project

    Great job on all this SN96! Now for the questions

    What exactly are you using the PING sensors for? They look really neat in the eye sockets, but I'm curious on their role in the system.

    Did you build this custom board? If so, could you talk about your experiences with developing the board?

    Care to elaborate on the software a bit?

    �In the long history of humankind (and animal kind, too) those who learned to collaborate and improvise most effectively have prevailed�
    - Charles Darwin

  4. #4
    Join Date
    Dec 2007
    Portland, OR
    Rep Power

    Re: The Bratinator Project

    Woohoo! Love this guy! Great job on the video!

    I really need to pick up a BRAT... would love to build it as a reverse leg bot and build a mini-mech out of it. Too bad I have my eyes set on a Bioloid kit next~

  5. #5

    Re: The Bratinator Project

    Quote Originally Posted by Alex View Post
    Great job on all this SN96! Now for the questions

    What exactly are you using the PING sensors for? They look really neat in the eye sockets, but I'm curious on their role in the system.

    Did you build this custom board? If so, could you talk about your experiences with developing the board?

    Care to elaborate on the software a bit?
    The ping sensors were for distance sensing. unfortunately, the sensors installed in the head did not work properly due to interference with the nose bridge. In order for the PING sensor to work properly, I found out that a tube needs to shroud the sensor evenly so the sonar is more focused. It worked well by using black construction paper curled in to 3/4" tubes and slipped over the sensors. I was not happy with this configuration so I removed them and used red LEDs for now.

    The Robotic Sensor Control Unit (I called it RSCU for short) was originally designed to cut down on the mess sensors and wires can create. With bipeds there is very little real-estate for sensors unlike rovers. I decided that I wanted to custom build a board that will allow me to have all the sensors I wanted for my biped, in one neat package. Since I wanted my head to see, hear, and speak evil, a board was required to bring it all together.

    The board has 3 main features for making the bot head come to life.

    - SpeakJet circuit for producing speech. The SpeakJet has optional event pins that could be used with sensors. One example is the memsic sensor, where if the bot tilts to much to one side or another, a pin could be made to go "HIGH" thus calling an event that produces the phrase "Woooah!"

    - Sound sensor. I had help from other members in the community to develop a simple circuit that would allow me to make my bot react to sound. I used Parallax's ADC0832 demo code to take the output of both mics and compare voltage levels. The mic with the greater voltage sensed the loudest sound.

    - Memsic tilt sensor. Used for detecting orientation. With the tilt sensor, I can detect if the bot is on its back, front or leaning to much to one side or the other.

    - Port for the ping sensor. This has no built in circuitry, it's only purpose was to allow quick and ease detachment of the bot head. With a port, I can simply unplug the ping wires if I need to remove the head without having to mess with anything else.

    The PC board went through 5 prototypes after a bread board design, each one with improvements on the last. Some changes were just silkscreen errors, other changes were component routing errors and finally adding some component changes. The biggest improvement was the addition of the cap for the audio amp to provide more amplification. I used Eagle Cad to design my boards and to produce the fabs.

    The Bratinator is using Lynxmotion's SSC-32 servo controller connected to Lynxmotions Mini ABBII. MCU of choice is the AtomPRO.

    For the sequences I am using Lynxmotions SSC-32 Visual Sequencer which really helps design complex moves and sequences.
    Last edited by SN96; 02-25-2008 at 05:17 PM.

  6. #6

    Arrow Re: The Bratinator Project

    I vote The Bratinator to be the biped with the most attitude and personality! Everytime I see this biped walk or perform, I marvel at what Mike has accomplished. I would love to incorporate the hearing aspect so my robot could follow the loudest sound(s) in its environment. I also very much want to add a speech synthesizer.

    Well done, Mike!!

    I can handle complexity. It's the simple things that confound me.
    Do everything in moderation, ESPECIALLY, moderation..
    Sometimes the only way to win, is not to play.. -- Stephen Falken

  7. Re: The Bratinator Project

    Very nice project!

    Can you please upload your code for this project or at least PM me it . I am working with a BRAT robot as well.

  8. #8
    Join Date
    Apr 2008
    Nelson, New Zealand
    Rep Power

    Re: The Bratinator Project

    SN96: Well done, I love it, I am also doing a biped Mech ED209 and would love to get this to walk like a mech, so I have some work cut out for myself. Again well done.
    People yearn after this robotic dream, but you can't strip your life of all meaning, emotion and feeling and expect to function.

  9. #9

    Re: The Bratinator Project

    This is a cool project... I'd be interesting in seeing updates if there's anything new going on.

  10. #10
    Join Date
    Dec 2008
    Rep Power

    Re: The Bratinator Project

    Sweet robot it really came together nice!
    Dalton Caughell

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts