BotronikS - Final code for all types of Arduino and PC users: -- HOME -- email: botronik@gmail.com
What you need to install or have installed before on your PC: see HERE

Control 8 outputs from PC
Upload this HEX code in Arduino Nano or Uno or Controllino Mini: Here
Test and use this PC application: Here or BotPcApp8o
Text commands: ABCDEFGH/abcdefgh turns Out1-Out8 ON/OFF