Drag to teach

Trajectory recording (including adaptive gripper) and playback can be realized.

Python version drag and teach only supports Pi and Jetson Nano versions in 280, 270, and 320 models.

Instructions：

1. Download Drag Teaching Python Code File
1. Copy the downloaded file to the robotic arm system.
1. Open the terminal and run the file:
```
  python drag_trial_teaching.py
```
After the file is run:
- 3.1 Select robot port
- 3.2 Enter the baud rate, the default is 1000000
  
  machine type Serial number baud rate
  
  270 PI /dev/ttyAMA0 1000000
  
  280 PI /dev/ttyAMA0 1000000
  
  320 PI /dev/ttyAMA0 115200
  
  280 Jetson Nano /dev/ttyTHS1 1000000
- 3.3 Choose whether debugging is required, debugging is not enabled by default
- 3.4 Finally, enter the function selection list, and the function selection is realized through the keyboard keys:
  - q: quit
  - r: start recording
  - c: stop recording
  - p: play once
  - P: loop / stop playback
  - s: Save this recording information, it will save the recording information to the record.txt file in the same directory as drag_trial_teaching.py
  - l: will load the information in the record.txt file in the same directory as drag_trial_teaching.py
  - f: relax all joints of the robot arm

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