# FastBot Lidar Issues

**URL:** <https://get-help.theconstruct.ai/t/fastbot-lidar-issues/39591>\
**Category:** Fastbot support\
**Created:** [January 9, 2026, 2:58pm UTC](https://get-help.theconstruct.ai/t/fastbot-lidar-issues/39591 "2026-01-09T14:58:44Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![AltinFeka](https://get-help.theconstruct.ai/letter_avatar_proxy/v4/letter/a/cab0a1/32.png) [@AltinFeka](https://get-help.theconstruct.ai/u/AltinFeka)\
**Post date:** [January 9, 2026, 2:58pm UTC](https://get-help.theconstruct.ai/t/fastbot-lidar-issues/39591/1 "2026-01-09T14:58:44Z")

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Hello,

I have tried running the fastbot in small city as part of the Linux for robotics introductory course - I managed to get it working but the ranges are not accurate - sometimes I would be 0.100-0.150m from the wall but the front range would come back as a large distance 0.600, 0.700, 0.900 - is this intentional, or is there an issue ?

Thanks in advance for the help!

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**Author:** ![roalgoal](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/roalgoal/32/7280_2.png) [@roalgoal](https://get-help.theconstruct.ai/u/roalgoal)\
**Post date:** [January 12, 2026, 9:35am UTC](https://get-help.theconstruct.ai/t/fastbot-lidar-issues/39591/2 "2026-01-12T09:35:45Z")

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Hi @AltinFeka, the real lidar is flipped 180 degrees (with respect to the simultaion) intentionally.

One way to confirm is to create a quick node that prints out several locations in the ranges array (`ranges(0)`, `len(ranges)/2`, etc.). Then you can move forwards towards a wall and see which value is decreasing. That will be your front value.