Support input from a USB scanner in python - such as this one:
https://www.amazon.co.uk/gp/product/B0736NNZNV/
These scanners are often 'hand-held' but it should work on any USB keyboard emulating scanner.
The library is very simple to use: just import it and in case, wait for input.
import logging
from usb_barcode_scanner.scanner import barcode_reader
if __name__ == '__main__':
try:
while True:
upcnumber = barcode_reader()
print(upcnumber)
except KeyboardInterrupt:
logging.debug('Keyboard interrupt')
except Exception as err:
logging.error(err)
Alternatively, you also could open the input from the barcode scanner in an extra step:
from usb_barcode_scanner.scanner import BarcodeReader
reader = BarcodeReader()
# Prepare something like sending a command to transport something near the scanning interface
upcnumber = reader.read_barcode()
Per default, the script opens a scanning device at /dev/hidraw0. If the device gets another address,
you can simply set that adddress as an argument:
from usb_barcode_scanner.scanner import barcode_reader
upcnumber = barcode_reader("/dev/hidraw1")
# or
from usb_barcode_scanner.scanner import BarcodeReader
reader = BarcodeReader("/dev/hidraw1")
upcnumber = reader.read_barcode()
The project is really quite simple so if there's any difficulty with installing via pip, just copy the scanner.py into the root of your project and import from there:
from scanner import barcode_reader
PyPI homepage: https://pypi.org/project/usb-barcode-scanner-julz/
GitHub: https://github.com/julzhk/usb_barcode_scanner
install with:
pip install usb-barcode-scanner-julz
Generate barcodes : https://graphicore.github.io/librebarcode/ Alterative implementation (using evdev instead of the hidraw stream) : https://gist.github.com/michalfapso/1755e8a35bb83720c2559ce8ffde5f85
Tested and working in Linux and Raspberry Pi using Python 3.6+. It won't work for windows.
The software is provided "As is", without warranty of any kind, express or implied. Please see the MIT license attached.
Questions? Drop me a line : [email protected] or add a support ticket here in github.
Suggestions and improvements welcome. I'm sorry I'm not very active answering questions, but I'll get to them eventually