# Ros basics in 5 days project

**URL:** <https://get-help.theconstruct.ai/t/ros-basics-in-5-days-project/23160>\
**Category:** ROSDS Support\
**Created:** [March 18, 2023, 8:21pm UTC](https://get-help.theconstruct.ai/t/ros-basics-in-5-days-project/23160 "2023-03-18T20:21:02Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![girishkumar.kannan](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/girishkumar.kannan/32/6994_2.png) [@girishkumar.kannan](https://get-help.theconstruct.ai/u/girishkumar.kannan)\
**Post date:** [March 19, 2023, 5:04am UTC](https://get-help.theconstruct.ai/t/ros-basics-in-5-days-project/23160/2 "2023-03-19T05:04:23Z")

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Hi @80601 ,

That is because, unlike in the robot that you used in the course that used 180 degree laser scanner with `0 - right`, `360 - front` and `719 - left`, the turtlebot in rosject uses a 360 degree laser scanner that gives `0/719 - back`, `180 - right`, `360 - front` and `540 - left`.

Refer this post for more info: [Incorrect Robot Scan Values in ROS Basics Course - Wall Follower Robot / TurtleBot3](https://get-help.robotigniteacademy.com/t/incorrect-robot-scan-values-in-ros-basics-course-wall-follower-robot-turtlebot3/18688)

Regards,  
Girish

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