DOBOT_Magician_SimReal

a repsitory on basic simulation and control for 4 DOF manipulator DOBOT Magician with Python. This repo has two parts, DobotSim and DobotReal, which is for simulation and control of DOBOT Magician.

DOBOT_Magician_SimReal

DobotSim

We use Coppeliasim + Python for simulation of DOBOT Magician, these features are worth mentioned.

ZeroMQ API for python is adopted here, providing communication between coppeliasim and python
we are especially interested in the dynamics of robots in space, so the scene with gravity(DobotSim) and without gravity(DobotSimSpace) are both considered for comparision
Inverse kinamatics is solved in a numerical way using IK-plugin provided by coppeliasim
Simulation for non-gravity scene: The dynamics in space environment is very unstable, thus the error of of physics engine may lead to unexpected behavior(e.g., the robot in space scene may begin to move even no force is exert on it). Coppelisim allows user to select physics engine, we've tried bullet 2.78, bullet 2.83, ODE and Newton, and it seems that the physics engine provided by Newton Dynamics has the best stability.
tons of challenging problems are still to be solved, including
- posture control of the base of the robot(i.e., a satellite probably) while the robot arm is working
- planning of the robot
- a more complicated scene, we'll need a 6 DOF robot at least

DobotReal

DobotReal uses Python API provided by Yuejiang Robotics for secondary development.
/DobotReal/robot.py provides a simple class manipulator for these functions:

measure poses with hand-hold-teaching
save and load poses got by hand-hold-teaching
moving a object from one point to another point, providing trajectory planned in joint space and work space.
communicating with SUPCON CMC chip by serial and calling a CV classification method in class CVDect. ¹
siiimple assembling management

Download and Run

if you are going to use serial, install pySerial first.
clone this repo:

git clone https://github.com/YukiCR/DOBOT_Magician_SimReal.git

open the dir:

cd DOBOT_Magician_SimReal/

for DobotSim
```
cd DobotSim/
```
- open /DobotSim/DobotSim.ttt or /DobotSim/DobotSimSpace.ttt with Coppeliasim
- run Python code for controlling manipulator in Coppeliasim:
```
python basicControl.py
```

for DobotReal

cd DobotSim/

add /DobotReal into your PATH
connect your PC with DOBOT Magician with USB and turn on the robot
run python code:
```
python robot.py
```

this is an example of how do you use class manipulator:

import robot

r = manipulator(autoAsync=False, autoSetHome=True) # init a instance, it would connect and init the manipulator
buffer = r.measure(6) # measure 6 poses, release the button on arm to measure 1 pose
r.buffer2pose(buffer) # give this buffer to class attribute
# move from pose 1 to pose 2
r.point2point(0)
# move from pose 3 to 4
r.point2point(1)
# from 5 to 6
r.point2point(2)

Others

Thanks to Automation Experiment Center,CSE,ZJU for providing instructions and equipments
Thanks to Su and Youzi for help
if you are interested or my code have bugs, you can contact me at chengrui0103@foxmail.com
if your INTERESTS is INFRIGEMENTED, DO CONTACT me at chengrui0103@foxmail.com

CMC part and CVDetect are accomplished by Su and Youzi correspondingly, so this part of code is not included in this repo. ↩

YukiCR/DOBOT_Magician_SimReal

DOBOT_Magician_SimReal

DobotSim

DobotReal

Download and Run

Others

Footnotes