USB Serial Light Adapter (Arduino Compatible) [DFR0164] - 13.20EUR : komputer.de, Arduino Open Source Hardware
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Amazon.com: WITMOTION USB-UART 6-in-1 USB to Serial Converter, Multifunctional (USB to TTL/RS485/232, TTL-RS232/485, 232 to 485), Universal Adapter Module with CP2102 Compatible with Windows 7/8/10,Linux, Arduino : Electronics