hi. I have 8+ years of experience in RaspberryPi development. I have interfaced a variety of hardware like barcode readers, scale, printers and more. here are couple of my previous projets: ---( https://www.freelancer.com/projects/php/barcode-reading-software )--- and ---( https://www.freelancer.com/projects/mobile-phone/Android-Barcode-Duplication-App )--- I can make a solution for you. let's do it...