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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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USB 2.0 to TTL UART 6PIN Module Serial Converter CP2104 STC PRGMR Replace CP2102 With Dupont Cables|Integrated Circuits| - AliExpress
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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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