Quantity   Component name
1 × PCB See Github / OSH Park links
1 × ATmega328P-AU Microprocessors, Microcontrollers, DSPs / ARM, RISC-Based Microcontrollers
1 × ICSP header/socket 2x3 pins
1 × FTDI header/socket 1x6 pins
1 × (270 & 470 Ω resistors) 0805 size, only when programming 3.3V chips
1 × FTDI USB Serial Adaptor or similar