# How do the four jetson nano cameras work normally

**URL:** <https://forums.developer.nvidia.com/t/how-do-the-four-jetson-nano-cameras-work-normally/157576>\
**Category:** Jetson Nano\
**Tags:** camera\
**Created:** [October 21, 2020, 3:01am UTC](https://forums.developer.nvidia.com/t/how-do-the-four-jetson-nano-cameras-work-normally/157576 "2020-10-21T03:01:07Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![1316886298](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@1316886298](https://forums.developer.nvidia.com/u/1316886298)\
**Post date:** [October 21, 2020, 3:01am UTC](https://forums.developer.nvidia.com/t/how-do-the-four-jetson-nano-cameras-work-normally/157576/1 "2020-10-21T03:01:07Z")

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Jetson nano has four external cameras and uses TCA9546A for I2C expansion. How to modify the four cameras to work normally at the same time, is there any relevant reference materials?

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**Author:** ![ShaneCCC](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/shaneccc/32/14043_2.png) [@ShaneCCC](https://forums.developer.nvidia.com/u/ShaneCCC)\
**Post date:** [October 21, 2020, 4:05am UTC](https://forums.developer.nvidia.com/t/how-do-the-four-jetson-nano-cameras-work-normally/157576/3 "2020-10-21T04:05:53Z")

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Nano devkit should only support 2 sensors. Did you implement your own carrier board?

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**Author:** ![1316886298](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@1316886298](https://forums.developer.nvidia.com/u/1316886298)\
**Post date:** [October 21, 2020, 4:25am UTC](https://forums.developer.nvidia.com/t/how-do-the-four-jetson-nano-cameras-work-normally/157576/4 "2020-10-21T04:25:26Z")

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Yes, the carrier board designed by myself

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**Author:** ![1316886298](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@1316886298](https://forums.developer.nvidia.com/u/1316886298)\
**Post date:** [October 21, 2020, 4:26am UTC](https://forums.developer.nvidia.com/t/how-do-the-four-jetson-nano-cameras-work-normally/157576/5 "2020-10-21T04:26:51Z")

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The official software supports 4 cameras? Do I need to modify the device tree?

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**Author:** ![ShaneCCC](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/shaneccc/32/14043_2.png) [@ShaneCCC](https://forums.developer.nvidia.com/u/ShaneCCC)\
**Post date:** [October 21, 2020, 5:11am UTC](https://forums.developer.nvidia.com/t/how-do-the-four-jetson-nano-cameras-work-normally/157576/6 "2020-10-21T05:11:41Z")

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Have a reference to below document to implement the camera drivers.

[https://docs.nvidia.com/jetson/l4t/index.html#page/Tegra%2520Linux%2520Driver%2520Package%2520Development%2520Guide%2Fcamera\_sensor\_prog.html%23](https://docs.nvidia.com/jetson/l4t/index.html#page/Tegra%2520Linux%2520Driver%2520Package%2520Development%2520Guide%2Fcamera_sensor_prog.html%23)

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**Author:** ![nadeemm](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/nadeemm/32/367020_2.png) [@nadeemm](https://forums.developer.nvidia.com/u/nadeemm)\
**Post date:** [October 15, 2021, 4:11pm UTC](https://forums.developer.nvidia.com/t/how-do-the-four-jetson-nano-cameras-work-normally/157576/8 "2021-10-15T16:11:33Z")

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Closed on October 15, 2021, 4:11pm UTC