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Adafruit CP2104 Friend - USB to Serial Converter : ID 3309 : $5.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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ALPHA CP2104 USB To UART PCB Board Module with 2pcs16 Pin ALPHA Dedicated Extended Header Complies W/ USBXpress Driver Standard _ - AliExpress Mobile
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Comparing the CP2102 vs. CP2104: Highly-Integrated USB-to-UART Bridge Controllers - Free Online PCB CAD Library
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Amazon.com: YWBL-WH Converter Module CP2104 USB 2.0 to TTL UART 6PIN Module Serial Converter Board Module with Wire Support OS Windows 98/2000/XP/7/8/10 MAC OS-9 X-Windows CE Linux 2.40 or Higher Version, Module :
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