Raspberry Pi Zero Handheld Barcode Scanner Part 2 : Brian Dorey.com blog
Barcode/QR Code Reader using Arduino & QR Scanner Module
Build your own wand based barcode scanner
Barcode Reader/Scanner Module - CCD Camera - USB Interface : ID 1203 : $69.95 : Adafruit Industries, Unique & fun DIY electronics and kits
KEPUSHIYE DIY Accessories GM65 1D 2D Code Scanner Barcode Reader QR Code Reader Module 5V DC for Microcontroller : Amazon.de: Business, Industry & Science
Amazon.com : NETUM 2D Barcode Scanner, Compatible with 2.4G Wireless & Bluetooth & USB Wired Connection, Connect Smart Phone, Tablet, PC, 1D Bar Code Reader Work for QR PDF417 Data Matrix NT-1228BL :
How To Make QR code Scanner Toy at Home for Kids || QR code scanner for kids playing - YouTube
How do barcodes and barcode scanners work? - Explain that Stuff