This is a DIY arduino PRO mini which is like a regular arduino pro minni but it has less components but it works the same and it needs a CH340 or FT232RL USB to TTL convertor to program it.

if you don't have these convertors it's ok. simply follow the procedures below.

You will need : atmega328p(SMD) , 16MHz crystal , 220Ω resistor(SMD) , 22PF capacitor(SMD) (2) , 0.1uf capacitor(SMD) , LM7805 5v voltage regulator(SMD) , AMS1117_3.3V(SMD),LED(SMD) (4) , 2 pin pushbutton switch , female pin headers , A lot of lead. 

In case u don't have a (FT232RL) or (CH340) USB to TTL conveter, simply follow these steps,

• first take a regular arduino UNO board and REMOVE it's micro controller(ATmega328p).
• Then make these connections,

ARDUINO UNO R3 (regular arduino)DIY SMD ARDUINO UNO R3 (THIS PCB)RST

RSTGNDGNDVCCVCCRXRXTXTX

• after making the connections, simply go to the arduino IDE and upload a sketch.
• for more info about the connections click the link below.

arduino upload code using another arduino

These are the connections ↑.

Consider the breadboard as the DIY ARDUINO PRO MINI(this board)