Use Raspberry Pi Camera with Prusa Connect

README.md

Use Raspberry Pi and Pi Cam for Prusa Connect

I couldn't get the script from p123ad to work on my Pi Zero W 2 with Camera Module 3 (all kinds of ffmpeg errors). There are several built-in tools for working with the camera now, so I tried to figure out if I could use one of those instead.

Behold this version, which uses the built-in libcamera-still tool to actually interact with the camera and save a JPEG. That image is then uploaded to Prusa Connect, same as the original script.

Instructions

1. Go to the Cameras section at https://connect.prusa3d.com
2. Add a new camera by clicking "Add new other camera"
3. Copy the generated Token
4. Set up your Pi Zero W 2 with Raspian OS Lite (32-bit) (this may work with other combinations of Pi and OS but I haven't tested)
5. Log into your Pi and create a shell script with sudo nano /usr/local/bin/prusaconnect_upload_cam.sh and swap out connect-token-here in the script example with the Token you copied in step 3
6. Change ownership of the script to the user you log into your pi with, for example if your user is pi then run: sudo chown pi:pi /usr/local/bin/prusaconnect_upload_cam.sh
7. Make the script executable: chmod +x /usr/local/bin/prusaconnect_upload_cam.sh
8. Start the script with /usr/local/bin/prusaconnect_upload_cam.sh

If it works you should see no error messages, and a new image appearing in Prusa Connect every 10 seconds.

Create Autostart Service

To run the script in the background and have it start automatically when your Pi starts:

1. Create the service file with sudo nano /etc/systemd/system/prusaconnect_upload_cam.service, paste the content from below and save.
2. Start the service: sudo systemctl start prusaconnect_upload_cam.service.
3. Check if the service is running with sudo systemctl status prusaconnect_upload_cam.service.
4. Enable the service to run at startup: sudo systemctl enable prusaconnect_upload_cam.service.

prusaconnect_upload_cam.service

[Unit]
Description=Raspi Cam to Prusa Connect

[Service]
ExecStart=/usr/local/bin/prusaconnect_upload_cam.sh

[Install]
WantedBy=multi-user.target

prusaconnect_upload_cam.sh

#!/bin/bash

# Set default values for environment variables
: "${HTTP_URL:=https://connect.prusa3d.com/c/snapshot}"
: "${DELAY_SECONDS:=10}"
: "${LONG_DELAY_SECONDS:=60}"
# FINGERPRINT can be a random string with at least 16 characters
: "${FINGERPRINT:=123456789012345678}"
# CAMERA_TOKEN generated by the Connect server
: "${CAMERA_TOKEN:=connect-token-here}"

while true; do
    # Grab a frame from libcamera-still with the highest resolution
    # that is displayed on Prusa Connect: 1704 x 1278 for a 4:3 image
    # Setting the quality to 80 saves almost 50% in file size for
    # very little decrease in quality. Set to taste!
    # If you need to rotate the image 180° add `--rotate 180`
    # (One user reported needing to make this `--camera.rotate 180` instead!)
    libcamera-still -v 0 --immediate --width 2274 --height 1280 -q 80 -o /tmp/output.jpg

    # If no error, upload it.
    if [ $? -eq 0 ]; then
        # POST the image to the HTTP URL using curl
        curl -k -X PUT "$HTTP_URL" \
            -H "accept: */*" \
            -H "content-type: image/jpg" \
            -H "fingerprint: $FINGERPRINT" \
            -H "token: $CAMERA_TOKEN" \
            --data-binary "@/tmp/output.jpg" \
            --no-progress-meter \
            --compressed

        # Reset delay to the normal value
        DELAY=$DELAY_SECONDS
    else
        echo "libcamera-still returned an error, retrying after ${LONG_DELAY_SECONDS}s..."
        
        # Set delay to the longer value
        DELAY=$LONG_DELAY_SECONDS
    fi

    sleep "$DELAY"
done

@ToastCinnamon Did you try rebuilding your SD card from scratch with a fresh install of Raspian? That'll give you a baseline to know that at least the OS is setup properly. Then it's a matter of determining if it's the camera, or just the Pi itself. I only know that it works on a Pi Zero W 2 + Camera 3 for sure!

I've been able to make it work, I figured out why I got some errors. Firstly, I messed up with my token. I spend way to much time figuring out why it didn't work, only to realize it had a ":" to much. It looked like this:

: "${CAMERA_TOKEN:=:connect-token-here}"

So after correcting it and seeing that it worked, I cried about it for some time, and I continued to the next problem.

Since now it was broadcasting to my prusaconnect account, it was still upside down. So after some research I came across the solution. Instead of:

--rotate 180

I used:

--camera.rotate 180

Which now seems to work flawlessly.

I will post your script, but modified to my needs. Once I get home and I'm able to connect to my PI to copy everything and paste it here.

I want to thank you dearly for your help and posting the script, now I can happily watch what my printer is doing when I am away and need a quick print done before I get home!

@ToastCinnamon Glad you got it working! Feels good to solve a mystery. :) I'll make a note about camera.rotate in the script above to maybe help someone else in the future!

I have configured this for my Logitech, Inc. HD Pro Webcam C920:

BTW, on a fresh Pi Zero 2 I had to use --rotation 180 to make rotation work. Using --rotate or --camera.rotate gives me errors.

ERROR: *** unrecognised option '--rotate' ***
libcamera-still returned an error, retrying after 60s...

ERROR: *** unrecognised option '--camera.rotate' ***
libcamera-still returned an error, retrying after 60s...

Have a great day!

Updated the script to send the -k flag to curl: I was getting an error that the server's certificate couldn't be verified:

curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.

-k tells curl to skip this step.

You can use the script above to make Prusaconnect work with any camera with an RTSP feed. The easiest way I found to do this is with FFmpeg.

ffmpeg -y -rtsp_transport tcp -i rtsp://user:password@IP_ADDRESS_OF_RTSP -update -frames:v 1 -update 1 /tmp/output.jpg

Thanks for this guide

I got a Pi camera that died on arival so switched to a Webcam

Now you can use webcams with the above scritps but tweeked with different setups

Please see what I did

Setting Up a USB Webcam for Prusa Connect
Use a Raspberry Pi & Logitech C270 (or any USB webcam) to upload snapshots to Prusa Connect.

🔹 Features
✅ Automatically captures images every 10 seconds
✅ Uploads snapshots to Prusa Connect using API
✅ Runs continuously and restarts on boot

📌 Step 1: Install Required Software

sudo apt update && sudo apt upgrade -y
sudo apt install -y fswebcam curl

fswebcam → Captures images from the Logitech C270
curl → Uploads images to Prusa Connect

Step 2: Test the Camera

fswebcam -r 1280x720 --no-banner /home/pi/snapshot.jpg
ls -l /home/pi/snapshot.jpg

If the file exists, the camera is working!

Step 3: Create the Upload Script

nano ~/prusa-camera-upload.sh
Paste this:

#!/bin/bash

# Set default values for environment variables
: "${HTTP_URL:=https://connect.prusa3d.com/c/snapshot}"
: "${DELAY_SECONDS:=10}"
: "${LONG_DELAY_SECONDS:=60}"
# A unique string to identify your camera
: "${FINGERPRINT:=123456789012345678}"
# Prusa Connect Camera Token (Replace this with your actual token)
: "${CAMERA_TOKEN:=your_prusa_camera_token}"

while true; do
    # Capture an image using fswebcam
    fswebcam -r 1280x720 --no-banner /home/pi/snapshot.jpg

    # If capture was successful, upload it
    if [ $? -eq 0 ]; then
        curl -k -X PUT "$HTTP_URL" \
            -H "accept: */*" \
            -H "content-type: image/jpg" \
            -H "fingerprint: $FINGERPRINT" \
            -H "token: $CAMERA_TOKEN" \
            --data-binary "@/home/pi/snapshot.jpg" \
            --no-progress-meter \
            --compressed

        # Reset delay to normal value
        DELAY=$DELAY_SECONDS
    else
        echo "fswebcam failed, retrying in $LONG_DELAY_SECONDS seconds..."
        DELAY=$LONG_DELAY_SECONDS
    fi

    sleep "$DELAY"
done

Replace your_prusa_camera_token with your actual Prusa Connect camera token.

If you don’t have a token yet, generate one in Prusa Connect.

Example:
CAMERA_TOKEN="apJ3t1lz2d3Zqm5RI2E9"

Save and exit:

Press CTRL + X, then Y, then Enter.

Make the script executable:

chmod +x ~/prusa-camera-upload.sh

Step 4: Run the Script

~/prusa-camera-upload.sh

✅ If successful, check Prusa Connect Web Cameras for updates.
❌ If it fails, check for errors

Step 5: Automate the Script on Boot

crontab -e

Add This at the buttom:
@reboot /home/pi/prusa-camera-upload.sh >/dev/null 2>&1

Save and exit.

Restart cron:
sudo systemctl restart cron

I also reboot the Pi:
sudo reboot now

The script will automatically start on boot.

And here is my result

Am I the only one who gets regurarly status_code:204 error messages? It's totally random, usually I have to restart the service every day. Sometimes it works for 10 hours, sometimes for 40 hours. Do you have any idea how can I fix this?

sudo systemctl status prusaconnect_upload_cam.service
● prusaconnect_upload_cam.service - Raspi Cam to Prusa Connect
Loaded: loaded (/etc/systemd/system/prusaconnect_upload_cam.service; enabled; preset: enabled)
Active: active (running) since Fri 2025-02-07 19:03:31 CET; 2 days ago
Main PID: 27648 (prusaconnect_up)
Tasks: 2 (limit: 1568)
CPU: 2h 3min 53.964s
CGroup: /system.slice/prusaconnect_upload_cam.service
├─27648 /bin/bash /usr/local/bin/prusaconnect_upload_cam.sh
└─29610 curl -k -X PUT https://connect.prusa3d.com/c/snapshot -H "accept: /" -H "content-type: image/jpg>

Feb 09 18:53:19 raspberrypi prusaconnect_upload_cam.sh[29485]: {"status_code":204}
Feb 09 18:53:42 raspberrypi prusaconnect_upload_cam.sh[29496]: {"status_code":204}
Feb 09 18:54:20 raspberrypi prusaconnect_upload_cam.sh[29507]: {"status_code":204}
Feb 09 18:55:11 raspberrypi prusaconnect_upload_cam.sh[29518]: {"status_code":204}
Feb 09 18:55:44 raspberrypi prusaconnect_upload_cam.sh[29531]: {"status_code":204}
Feb 09 18:56:52 raspberrypi prusaconnect_upload_cam.sh[29542]: {"status_code":204}
Feb 09 18:57:28 raspberrypi prusaconnect_upload_cam.sh[29553]: {"status_code":204}
Feb 09 18:58:23 raspberrypi prusaconnect_upload_cam.sh[29564]: {"status_code":204}
Feb 09 18:58:50 raspberrypi prusaconnect_upload_cam.sh[29576]: {"status_code":204}
Feb 09 18:59:19 raspberrypi prusaconnect_upload_cam.sh[29587]: {"status_code":204}

@domosgabor So a 204 isn't an error in the HTTP world: it's a success and just the server saying "I have nothing to return": https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/204 Do you find that once the 204s start showing up that your webcam images don't update on the Prusa site?

@domosgabor So a 204 isn't an error in the HTTP world: it's a success and just the server saying "I have nothing to return": https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/204 Do you find that once the 204s start showing up that your webcam images don't update on the Prusa site?

Thanks for the clarification. Exactly as you said, the camera stops updating after getting 204 status code.

So it's not an error, but how can I investigate why the image is not updating?

Thanks for the snippets, it's very nice !

If you have an error like this when you check the logs of your service:

Jun 06 22:38:10 raspberrypi prusaconnect_upload_cam.sh[3694]: ERROR: *** failed to open file /tmp/output.jpg ***
Jun 06 22:38:10 raspberrypi prusaconnect_upload_cam.sh[3633]: libcamera-still returned an error, retrying after 30s...

You may have some permissions issues in the way your service is set.

Do this instead:

1. Delete and edit your service file
   sudo rm /etc/systemd/system/prusaconnect_upload_cam.service && sudo nano /etc/systemd/system/prusaconnect_upload_cam.service

2. Paste this, change your user name (often pi but can be something else) and save the file

[Unit]
Description=Raspi Cam to Prusa Connect
After=network.target

[Service]
ExecStart=/usr/local/bin/prusaconnect_upload_cam.sh
##################################
### CHANGE TO YOUR USERNAME BELOW  ###
##################################
User=your-username
Environment=XDG_RUNTIME_DIR=/run/user/1000
Restart=always

[Install]
WantedBy=multi-user.target

3. Restart your service

sudo systemctl daemon-reload
sudo systemctl restart prusaconnect_upload_cam.service

4. Check that it works correctly (you should see a 204 server response after a few seconds)

journalctl -u prusaconnect_upload_cam.service -f

5. If it works, set the service to start at boot

sudo systemctl enable prusaconnect_upload_cam.service