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Update how_to_build_and_install.md (build directory/permission/dependency issue) #48

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Update how_to_build_and_install.md (build directory/permission/dependency issue) #48

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12 changes: 9 additions & 3 deletions doc/howto/how_to_build_and_install.md
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Expand Up @@ -39,7 +39,7 @@ if you want to use python API, you need to install python and swig:
In the YDLidar SDK directory, run the following commands to compile the project:
```
git clone https://github.com/YDLIDAR/YDLidar-SDK.git
cd YDLidar-SDK/build
mkdir YDLidar-SDK/build && cd YDLidar-SDK/build
cmake ..
make
sudo make install
Expand Down Expand Up @@ -95,11 +95,16 @@ Three samples are provided in samples, which demonstrate how to configure YDLida

![](images/sequence.png)

### Ubuntu 18.04/16.04 /14.04 LTS
For Ubuntun 18.04/16.04/14.04 LTS, run the *tri_test* if connect with the Triangle LiDAR unit(s) or TOF LiDAR unit(s):
### Ubuntu 20.04/18.04/16.04/14.04 LTS
For Ubuntun 20.04/18.04/16.04/14.04 LTS, run the *tri_test* if connect with the Triangle LiDAR unit(s) or TOF LiDAR unit(s):
```
./tri_test
```
* If you have connection(binding) issue, try to set permission of USB port
```
sudo chmod 666 /dev/ttyUSB0
```

### Windows 7/10
After compiling the YDLidar SDK as shown in section 4.1.2, you can find `tri_test.exe` in the {YDLidar-SDK}\build\Debug or {YDLidar-SDK}\build\Release folder, respectively, which can be run directly.

Expand Down Expand Up @@ -155,6 +160,7 @@ python tof_test.py
# If it's a drawing
pip install numpy
pip install matplotlib
sudo apt-get install python-gi-cairo
python plot_tof_test.py
```
![](images/ydlidar_lidar_monitor.png)
Expand Down