This is a simple and easy way to program a Pro mini w/o a serial adapter. Things you need. 1 Arduino Uno, Mega, Leonardo, Due, or Nano,1 The Pro Mini you are going to program.1 Usb cable With type A plug on one end and type B on the other.5 jumper wires to connect the Pro Mini to the other board.... By: A Homeschoolers Workbench