Overview | Adafruit CP2104 and CP2102N Friend - USB to Serial Converter | Adafruit Learning System
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CP2104 Programmer – ESProto
CP2104 USB to Serial Converter Arduino Programmer | Makerfabs
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CP2104 Datasheet(PDF) - Silicon Laboratories
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Adafruit CP2104 Friend - USB to Serial Converter : ID 3309 : $5.95 : Adafruit Industries, Unique & fun DIY electronics and kits