Amazon.com : Waveshare Barcode Scanner Module 1D/2D Codes Barcode, QR Code Reader Onboard Micro USB and UART Serial Port Directly Plugged into Computer : Office Products
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Connecting barcode scanner to Arduino using USB Host Shield « Circuits@Home
Amazon.com : Barcode Scanner Module, 1D/2D Codes Reader Decode Barcode, QR Code etc Onboard Micro USB and UART Interface Plug into a Computer Directly or Other Device Onboard Light Source can Work