Jetracer Python examples

graham.hilton23 · September 23, 2020, 11:15am

Hello

I am writing a report on Autonomous Vehicles and have a Jetracer kit from Waveshaw with a jetson nano. I am using Jupyter and python to test a few things and want to know if I can actually have programmatical control over the throttle and steering without using any widgets or traitlets. I think this is possible by using the motors direct but not sure how to do this at the moment. While some of the demo code is ok I would like to do this from scratch!

kayccc · September 23, 2020, 11:08pm

Hi

Please refer to below threads to see if can help:

graham.hilton23 · September 24, 2020, 12:33am

Nope, none of this helps. I can use the motors fine but what I want to do is write my own code. I have used adafruit for the front steering servo and this works really well. The two rear wheel motors using this do not work no matter what channel I use. If I use the supplied python code and then car.throttle = 1 it works fine.

Is there a way of programming the steering and the throttle without using any traitlets or widgets just by pure python code?

graham.hilton23 · October 8, 2020, 9:36pm

This has been sorted now, the only issue I have at the moment is I cannot run a CNN model on the jetson Nano as the cuda drivers will not load.

Ok so my question is how can I install tensorflow-gpu==1.15 and all the dependencies? currently all i see is errors as no tensorflow versions available :(

kayccc · October 15, 2020, 6:11am

Please refer to Jetson Zoo - eLinux.org

graham.hilton23 · October 15, 2020, 12:55pm

Sadly following this through I have the same message I receive on all versions of TensorFlow when installing - Ettot: No matching distributions found. or installed v1.13 errors when running the cnn (very small model to test even fails).

Error: could not find the algorithm which may be because the cudnn failed to initialise

If I cannot have this working in the next 24hrs my thesis is ruined. I chose the Jetson as on paper it had every everything I needed to write my own autonomous driving model but this does not appear so as I the architecture I need to run fails!

AastaLLL · October 16, 2020, 2:04am

Hi,

If you are using JetPack4.4, please use the v1.15.3+nv20.8 package.
Please noticed that it’s required to use the package built with the same JetPack version to make it compatible.

You can find more information in our document:
https://docs.nvidia.com/deeplearning/frameworks/install-tf-jetson-platform/index.html

$ sudo pip3 install --pre --extra-index-url https://developer.download.nvidia.com/compute/redist/jp/v44 ‘tensorflow<2’

Thanks.

graham.hilton23 · October 16, 2020, 1:23pm

Many thanks for a quick response, One other question the image jetcard_v0p0p0 what jetpack should be pre-installed? Is there a way on the Nano to confirm this?

I have been to link and followed the instructions to no avail and will try the above again one last time!

Many Thanks

Graham

graham.hilton23 · October 17, 2020, 12:57am

Still the same error!,

AastaLLL · October 19, 2020, 3:25am

Hi,

The error indicates that the image doesn’t build on JetPack4.4.
Please help to confirm this with the following command:

$ cat /etc/nv_tegra_release

For JetPack 4.4, it should be R32.4.3.
Thanks.

graham.hilton23 · October 19, 2020, 10:44am

Hi

This is the results of the command

Thanks

Graham

AastaLLL · October 21, 2020, 8:50am

Hi,

Based on the log, you are using rel32.1.0, which is released a long time ago.

We don’t have any prebuilt TensorFlow v1,15,1 for the OS.
Would you mind to reflash your device with the latest JetPack first?

Thanks.

graham.hilton23 · October 21, 2020, 11:22am

To my knowledge this was the latest version! Could you let me have a link to the latest version and I will gladly re-flasy!!

Thanks

Graham

AastaLLL · October 22, 2020, 3:03am

Hi,

The latest OS version is rel-32.4.4.
Please reflash it from the SDK manager here:

Thanks.

graham.hilton23 · October 22, 2020, 9:48am

Hello

I cannot install the SDK would this be because the Jetson nano only has 4GB RAM it in the requirements it says 8?

Thanks

Graham

graham.hilton23 · October 22, 2020, 5:40pm

Hello

Trying to install the SDK, I understand I need to do this on a linux PC not the Jetson. I have loaded virtual box with ubuntu installed but then it says no Jetson Nano connected!!?? Then My laptop blue screens and reboots. Is there another way to do this with out using the SDK Manger?

Many Thanks

Graham

dusty_nv · October 22, 2020, 5:47pm

Hi @graham.hilton23, for Jetson Nano you don’t need to use SDK Manager - you can simply flash your Nano’s SD card from a PC running Windows/Mac/Linux. You take your Nano’s SD card out and put it into your PC, and then use Balena Etcher from your PC to flash it. You can follow the procedure in the Jetson Nano Getting Started Guide here:

graham.hilton23 · October 22, 2020, 6:16pm

Hi,

Yes I understand this but I am being told the version I have is really old and may be the cause of the issues I have!

Cheers

Graham

dusty_nv · October 22, 2020, 6:20pm

You can update to the latest JetPack version by re-flashing your SD card with the latest image:

https://developer.nvidia.com/jetson-nano-sd-card-image

MtHiker · October 23, 2020, 1:28am

It is a little old L4T version.
If you want to run JetPack 4.4 on your JetRacer, you should use other image.
Houw about this?
https://drive.google.com/file/d/1TgPngZwup2vJZnt0VnA1yUAQWoGe935a/view?usp=sharing