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  • Author Author: kellyhensen
  • Date Created: Date Created
  • Last Updated Last Updated:
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Open Source Inventory Warehousing System -- Episode 534

MAYER MAKES Engineering Resin (https://mayermakes.at/engineering-resin/)3D basics Color Ampule Black

 

For a lot of makers, selling their creations is a big goal.
Unsatisfied with the current options to sell DIY products Clem started building his own website. When many orders trickle in, it's easy to confuse items when packing. So Clem uses the REST API of his website a Raspberry pi 3A+ and a Barcode Scanner to build a warehousing system that helps you pack Orders and ship them out ASAP!

 

Supplemental Content:

Bill of Material:

Product Name Manufacturer Quantity
"MULTICOMP PRO Industrial Pushbutton Switch Multicomp pro 1 Buy Now
"PRO SIGNAL HDMI to VGA Adaptor Lead" Pro signal 1 Buy Now
"OPTICON Black USB Barcode CCD Scanner" Opticon 1 Buy Now
Raspberry PI 3A+  1 No longer stocked - see alternative below
Alternative:
"DFROBOT Single Board Computer Lattepanda Dfrobot 1 Buy Now
"ALCOSWITCH - TE CONNECTIVITY Industrial Pushbutton Switch Alcoswitch 1 Buy Now

Additional Parts:

Old PC monitor
Vga cable
PMMA for lasercutting or other material for mounting the SBC
MAYER MAKES Engineering Resin 
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  • the Issue with the input() function in a python script mentioned in the video has been solved thanks to our viewer Rene Snijders from the netherlands!
    Here is his solution:

    Rene just wrote a simple input & print :

    ---- myprogramm.py

    #simple input
    barcode = input ("Enter Barcode :")
    print(barcode)

    ---- myprogramm.py

    Then in the terminal as root or sudo -i

    mkdir -p /etc/systemd/system/getty@tty1.service.d
    echo "[Service]" > /etc/systemd/system/getty@tty1.service.d/override.conf
    echo "ExecStart=" >> /etc/systemd/system/getty@tty1.service.d/override.conf
    echo "ExecStart=-/usr/bin/python3 /home/pi/myprogramm.py" >> /etc/systemd/system/getty@tty1.service.d/override.conf
    echo "StandardInput=tty"  >> /etc/systemd/system/getty@tty1.service.d/override.conf
    echo "StandardOutput=tty"  >> /etc/systemd/system/getty@tty1.service.d/override.conf

    sync
    sudo reboot

    And with every keyboard attached the program runs perfect.

    the most common barcode scanners mimic a HID (KeyBoard)

    Tested with a clean install of armbian ( on a OrangePi ) but systemd = systemd this must work for you to.

    I hope you got a spare Pi to test this

    Kind Regards from the Netherlands,

    René

    I had to adapt it a little bit for my application since Raspbian buster gave me a permission error even elevated as sudo:

    the Echo method did only give me permission errors so I edited the file in nano.

    changes I had to do on Raspbian Buster:
    mkdir -p /etc/systemd/system/getty@tty1.service.d
    sudo nano /etc/systemd/system/getty@tty1.service.d/override.conf

    enter these lines:

    ExecStart=-/usr/bin/python3 /home/pi/myprogramm.py
    StandardInput=tty1
    StandardOutput=tty1

    sync
    reboot

    This now allowed me to run  the script shown in the video on the push of a button or from a crontab!


    Rene is a very experienxed UNIX/Linux Guy so I also share his tip here that might come in handy for screen recording:

    do you know how to enlarge the font size for the console on the Rasperry ?

    sudo dpkg-reconfigure console-setup

    search for terminus font ;-) and a larger pixel ;-) this makes it more readable on a high-res monitor ;-)

    A Big thank you to Rene for sharing his knowledges with us!

Comment

  • the Issue with the input() function in a python script mentioned in the video has been solved thanks to our viewer Rene Snijders from the netherlands!
    Here is his solution:

    Rene just wrote a simple input & print :

    ---- myprogramm.py

    #simple input
    barcode = input ("Enter Barcode :")
    print(barcode)

    ---- myprogramm.py

    Then in the terminal as root or sudo -i

    mkdir -p /etc/systemd/system/getty@tty1.service.d
    echo "[Service]" > /etc/systemd/system/getty@tty1.service.d/override.conf
    echo "ExecStart=" >> /etc/systemd/system/getty@tty1.service.d/override.conf
    echo "ExecStart=-/usr/bin/python3 /home/pi/myprogramm.py" >> /etc/systemd/system/getty@tty1.service.d/override.conf
    echo "StandardInput=tty"  >> /etc/systemd/system/getty@tty1.service.d/override.conf
    echo "StandardOutput=tty"  >> /etc/systemd/system/getty@tty1.service.d/override.conf

    sync
    sudo reboot

    And with every keyboard attached the program runs perfect.

    the most common barcode scanners mimic a HID (KeyBoard)

    Tested with a clean install of armbian ( on a OrangePi ) but systemd = systemd this must work for you to.

    I hope you got a spare Pi to test this

    Kind Regards from the Netherlands,

    René

    I had to adapt it a little bit for my application since Raspbian buster gave me a permission error even elevated as sudo:

    the Echo method did only give me permission errors so I edited the file in nano.

    changes I had to do on Raspbian Buster:
    mkdir -p /etc/systemd/system/getty@tty1.service.d
    sudo nano /etc/systemd/system/getty@tty1.service.d/override.conf

    enter these lines:

    ExecStart=-/usr/bin/python3 /home/pi/myprogramm.py
    StandardInput=tty1
    StandardOutput=tty1

    sync
    reboot

    This now allowed me to run  the script shown in the video on the push of a button or from a crontab!


    Rene is a very experienxed UNIX/Linux Guy so I also share his tip here that might come in handy for screen recording:

    do you know how to enlarge the font size for the console on the Rasperry ?

    sudo dpkg-reconfigure console-setup

    search for terminus font ;-) and a larger pixel ;-) this makes it more readable on a high-res monitor ;-)

    A Big thank you to Rene for sharing his knowledges with us!

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