Quantity   Component name
1 × ATMEGA328P Microprocessors, Microcontrollers, DSPs / ARM, RISC-Based Microcontrollers in a 28pin QFN/MLF package.
1 × LDK220 - 5V regulator A tiny 5v regulator with ultra low drop out in a SOT323-L5 package.
2 × SMD tact switch A Sub-miniature momentary push switch.