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Edog - Mini 3D printed Quadruped Robot ✨

Hi, I'm edog, I'm a robotic project under development.
I will participate to the eurobot cup 2021 in July and will become open source

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**** ᴛʜɪꜱ ᴘʀᴏᴊᴇᴄᴛ ɪꜱ ᴏᴘᴇɴ ꜱᴏᴜʀᴄᴇ ****

🦄 Everything you need to build your own robot dog is documented and explained at edog.io 🌈

STL Download link: https://www.thingiverse.com/thing:4910279
Electronic part: https://hackaday.io/project/177204-edog-mini-3d-printed-quadruped-robot Sections "Componants"

This robot is 100% 3D printable, very simple and cheap. He embeds a Raspberry pi Zero and allow you to run many Linux distrib. Edog can controle 16 servo motor simultaneously and still have the whole GPIO board available to plug anything you want

The community is looking for people who want to get involved in this project:

💡 Anyone seriously involved will be able to receive a free prototype and spare part ! 💡
Contact me at gautlier.lecail@gmail.com if you're interested

Challenges / Constraints :

  • 100% 3D printable (without support)✔️
  • Under 300gr weigh✔️
  • Under 100$ budget ✔️
  • Easy to build ✔️
  • Linux embedded✔️
  • ROS2 Environment  ⌛
  • Modular design / components ✔️
  • Starter kit sell ⌛


Achieved:

  • The robotic frame (3D printed, easy to assemble, workable and viable)
  • A stable electronic environement (5V powered, 8A max, Raspberry pi, 16 servo driver)
  • Inverse Kinematics
  • Socket service to control the robot from a network
  • Walking motion v.1

On going

  • Software Framework
  • Walking motion v.2

To do:

  • Explode data from the gyro module
  • Refactoring the embedded code
  • Multi edog control

For the eurobotCup 2021:

  • Obstacle detection (using a simple HC-SR04 Ultrasonic Distance Sensor) ✔️
  • Embedded webcam❌
  • Computer vision for object recognition and travel estimation❌
  • Arm actuator  ✔️

tibia.stl

You need to print 2 x tibia and 2 x mirrored tibia Also add one Transparent Pieces Adhesive Feet for each leg (ref: https://cutt.ly/mmL6V7e)

Standard Tesselated Geometry - 139.24 kB - 07/16/2021 at 20:05

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Standard Tesselated Geometry - 196.86 kB - 07/16/2021 at 20:05

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Standard Tesselated Geometry - 162.68 kB - 07/16/2021 at 20:05

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Standard Tesselated Geometry - 139.54 kB - 07/16/2021 at 20:05

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README.md

Dowload link and instructions

md - 91.00 bytes - 07/16/2021 at 20:05

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  • 1 × Raspberry pi Zero WH
  • 1 × Driver Servo - PCA9685 16' canaux 12-bit pwm- I2C
  • 1 × Power supply - HENGE 8A UBEC 5v / 6v / 7.4v 7V-25.5V Input for 2-6 Lipo
  • 1 × GY-521 MPU6050 3 Axes Accelerometer Gyroscope
  • 8 × Servo Motors - VOTIK 7455 MG-D 9g

View all 6 components

  • Demo Servo Controller python

    Gaultier Lecaillon07/16/2021 at 20:48 0 comments

    Please find below the wiring diagram in order to correctly use the Driver Servo - PCA9685 16' with the I2C

    Simple code example to set all 8 servo to the angle 50° (please note that the angle nedd to be: 0 < angle < 180)

    from adafruit_servokit import ServoKit
    
    kit = ServoKit(channels=16)
    
    for i in range(0, 7):
            kit.servo[i].angle = 50

  • STL Files released 16/01/2021

    Gaultier Lecaillon07/16/2021 at 20:25 0 comments

    I finally uploaded stl parts online for Edog ! 

    Prints are extremely simple, you don't need any support if you set the "support overhang angles" to 51°. The only trick is to print two "tibia" mirrored in order to print left and right tibia, the femur is already symmetrical and can be printed 4 times.

    Download link: https://www.thingiverse.com/thing:4910279


    PS: I didn't publish the shell, I'm not satified by the shape, I will uplaod it later :)

  • Next Tuesday, Eurobot 2021 Cup will begin !

    Gaultier Lecaillon07/02/2021 at 13:44 0 comments

    I am very excited about my third participation in the competition, I have no doubt that my robot will be the smallest of all team and maybe the only quadruped 🙃

    Here is the video I made with my former team Evolutek in 2019:



    My goal is obviously not making many points but challenge the edog design to see if he can adapt in different environment and have feedback from other roboticist and engineer 


  • Beacon Controller

    Gaultier Lecaillon02/14/2021 at 11:53 0 comments

    As explain, edog will participate in the Eurobot cup. 

    To do so, I need to know the robot position in (x, y) on the table. But I can't use embedded lidar or using triangulation due to its small size and its limited capacity to carry heavy components. 

    So What I will attempt to do is using a beacon with a camera and estimate the position giving a video flux.

    This beacon is composed with an NVIDIA Jetson Nano 2gb board, a TPLink Nano Router, a 7inch touchscreen and a DC converter to 5v and 5A. that allow to used 3s to 6s lipo to power up the sytem.


    Here an exemple of the team ARIG Robotique (more infos here)

    Step #1: original video

    Step #2: Optical distortion usgin OpenCv in python

    Step #3: projection in an orthonormal coordinate system

  • Exploded view of all edog components

    Gaultier Lecaillon01/31/2021 at 00:00 0 comments

    All the stl files will be drop after the French Eurobot cup, the 1st June 2021.

    here you can see all the part involves, Everything has been design for an easy build and easy printed without support needed.

    Only 4 * M3 screw are needed for the frame ! 🔩
    It makes edog very simple to build, so everyone can build his own easely

  • eDog Walking demo 31/01/2021

    Gaultier Lecaillon01/30/2021 at 23:40 0 comments

    All legs are controlled by an inverse kinematics algorithm. ROS2 will be implement soon !

View all 6 project logs

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Discussions

Dejan Ristic wrote 07/13/2021 at 15:40 point

Neat design!
In the video it was only walking a straight line. Do you have code to make it turn corners as well? 

  Are you sure? yes | no

Gaultier Lecaillon wrote 07/17/2021 at 15:45 point

I can make it turn with little jumps ^^ see: https://youtu.be/g4vvNWdrd0w?t=131

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Dejan Ristic wrote 07/21/2021 at 07:05 point

Watched it. Cute!
French robot cup 2021 huh? Looks like loads of fun. Wish we had contests like that in my country.

  Are you sure? yes | no

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