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AltSoftSerial Library, for an extra serial port
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USB to UART serial bridges
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Amazon.com: 2 Pieces ESP32-CAM WiFi Board ESP32-CAM-MB Micro USB to Serial Port CH340G with OV2640 2MP Camera Module Compatible with Arduino IDE Arduino Raspberry Pi : Electronics
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Amazon.com: Cylewet 2Pcs FT232RL 3.3V 5.5V Module USB to TTL Serial Adapter Module for Arduino Mini Port USB to Serial Interface Module (Pack of 2) CYT1007 : Electronics
How To Use The Native USB Of The Arduino Due For High-Speed Communication - Copperhill
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Serial OTG. Arduino CH340. FTDI. rkl099's Extension - Tutorials and Guides - MIT App Inventor Community
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Yún – How to add a serial port – lucadentella.it
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