Hi Jason,

This might help... but I too had a problem when I tried to explicitly install the snapshot version (my install also reported 'Successfully installed depthai-2.1.0.0') and so I just went back to the default install instructions and the issue automagically went away...

(pip uninstall depthai)
sudo curl -fL http://docs.luxonis.com/_static/install_dependencies.sh | bash
python3 install_requirements.py
git clone https://github.com/luxonis/depthai-python.git

I have since been able to successfully run the example scripts.

I am running RPi4 using VNC (and also sometimes directly via bluetooth keyboard and HDMI). I too am using virtual environments.

FWIW - interestingly - VNC so far works perfectly... but I have experienced 'weird issues' when trying to do the same work using my bluetooth keyboard and HDMI.

Hope this is helpful.
Cheers

Jason. Apologies. I was mistaken. I take detailed notes, and should have checked them before responding. (I must have been thinking of something else that resulted in "Illegal instruction".)

My error message was:

(lux_only) pi@oak1b:~/depthai-python/examples $ python3 01_rgb_preview.py 
Traceback (most recent call last):
  File "01_rgb_preview.py", line 23, in <module>
    with dai.Device(pipeline) as device:
RuntimeError: Failed to find device (ma2480), error message: X_LINK_DEVICE_NOT_FOUND

Most likely due to trying to run Gen2 examples with Gen1 depthai, I would think.

My venv/bin is :

(lux_only) pi@oak1b:~/.virtualenvs/lux_only/bin $ ls -al | grep python
lrwxrwxrwx 1 pi pi   16 Apr  1 11:34 python -> /usr/bin/python3
lrwxrwxrwx 1 pi pi    6 Apr  1 11:34 python3 -> python
lrwxrwxrwx 1 pi pi    6 Apr  1 11:34 python3.7 -> python

And in the hope that it might be helpful, I will include my entire install notes below:

Downloaded 32 bit via Raspberry Pi Imager
Set time/loc/passwd/connected to WLAN/ran upddates / rebooted
Renamed host to 'oak1b'

>Preferences>Raspberry Pi Configuration
    Renamed to 'oak1b'
    Enabled camera, VNC, SSH
    Increased GPU to 128
    rebooted / checked settings

set static wifi ip / disabled IPv6 / rebooted

connected to vnc 
sudo rpi-eeprom-update checked
right click on Task Bar and Add/Remove Panel items.
    added CPU temp
    added CPU usage

sudo apt update
sudo apt full-upgrade
sudo apt install python3 python3-pip

sudo apt install build-essential cmake pkg-config
sudo apt install libatlas-base-dev gfortran
sudo apt install libhdf5-serial-dev hdf5-tools
mkdir python-envs && cd python-envs

pip3 install virtualenvwrapper

sudo nano ~/.bashrc

export WORKON_HOME=$HOME/.virtualenvs
export PROJECT_HOME=./python-envs
export VIRTUALENVWRAPPER_PYTHON=/usr/bin/python3
export VIRTUALENVWRAPPER_VIRTUALENV=~/.local/bin/virtualenv
source ~/.local/bin/virtualenvwrapper.sh
export VIRTUALENVWRAPPER_ENV_BIN_DIR=bin

exit

mkvirtualenv lux_only

[my notes are not clear at this point - but essentially - within the lux_only env, I followed the basic steps of dependencies.sh, install_reqs and then I wasn't sure which depth-ai to install, and ended up trying to install Gen1, and I think the snapshot (though maybe I am mistaken and am remembering a previous occasion...); 
but the end result was that I ended up running: pip uninstall depthai]

//then my notes start again...

python3 install_requirements.py
...Installing collected packages: depthai
Successfully installed depthai-2.1.0.0

After that I was successfully able to execute the scripts in the examples folder.

I hope this is helpful, and apologies for my initial incorrect response.

Thanks, Ryan! And let us know if this doesn't solve it, Jason.

Hi @Jason ,

Sorry about the delay. So I'm not sure if it's related, but when we upgraded our Pi's recently, based on a tip from a local company here, we discovered that on the latest Pi OS we have some sort of issue that was not there at all on the previous versions. Here is the summary so far:

https://github.com/luxonis/depthai/issues/354

I do not know if this is related though. We had indeed gotten OAK-1 (and other depthai models working) on Pi Zero, but there may be some regression related to the above, or perhaps some other regression.

Will test it out and report back. We have @themarpe and @GergelySzabolcs in parallel investigating what is going wrong here.

Sorry about the issue/delays here.

-Brandon

Jason Thanks and sorry for the pain. I'm asking internally about pre-building the Pi Zero wheels as well automatically.

I just responded to the Github issue on which version does work - but TLDR unfortunately I don't know yet as I didn't write down the version I was on when I did a dist-upgrade. But we have logs of this so @Brian is looking into it and we'll circle back.

Our forum software is confusing. It makes the link look like an image because it has Google Docs integration. So the above is actually a link to the Google Drive folder. Below is the same thing written as code so that our forum software doesn't show it looking like an image:

https://drive.google.com/file/d/1pEb0_OCA3eYZAncolTHy8hSlQiK2S0KX/view

Here is the link with our forum software allowed to show it as embedded content:

Jason
You need to enable X forwarding if you are connected through SSH,
ssh pi@<ip_address> -X

I always forget how to properly get XForwarding working. I ended up getting a mini-HDMI to HDMI adapter cable (here) and then a micro USB adapter (here) which I hooked to a USB hub (here) for doing all the initial testing on the Pi. That way I could get everything working first before fighting XForwarding