Connecting barcode scanner to Arduino using USB Host Shield « Circuits@Home
Using RFID and SD card. Multiple devices on SPI. : r/arduino
Arduino Uno and Mega2560 Spi Module TFT LCD Driver Board 2.0 Inch 176X220 Spi Serial Bus Module Display - China Touch Screen and LCD Screen price | Made-in-China.com
Tzt Mfrc-522 Rc-522 Rc522 Antenna Rfid Ic Wireless Module For Arduino Ic Key Spi Writer Reader Ic Card Proximity Module - Integrated Circuits - AliExpress
Use an nRF24L01 Module to Scan the 2.4GHz Frequency Range