DIY serial programmer for breadboard Arduino - Microcontrollers - Arduino Forum
USB-Powered PIC Programmer Circuit Diagram
Amazon.com: Feanteek FTDI USB to TTL Converter Built-in FT232RL Uart USB TTL Serial, DIY USB TTL Adapter for Programming Arduino Nano Raspberry Pi : Electronics
USB AVR Programmer
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This DIY UPDI Programmer Is Nice And Cheap | Hackaday