Arduino Pro Mini ATmega328p
This is a low cost 5V arduino made with ATmega328p running the 16MHz bootloader. This board is intended for users who requires flexibility, small size and low cost. It has an on-board voltage regulator so that it can accept voltages in the range 5 to 12V. You can upload sketches to this board using FTDI USB to UART Converter or using another Arduino Board. This board does not comes with connectors, so that you can solder connectors or wires as per your requirements.
FT232 USB to UART TTL converter
Convert USB to UART using of FT232 USB to UART TTL Converter. It can also be used to program ArduinoUNO ATMEGA 328 and directly use it circuits. Compatible with 3.3V and 5V UART TTL.