Since November 2017, I had a project to retrofit a machine and called it "weather machine". The main purpose for this machine was to check the quality of paint for vehicles (car/motorcycle). Miniature sunshine and rain (weather) are processed inside this machine. I decided to use Arduino Nano and Android application. This project was finished on the 1st of February 2018 and already trialed on the 15th of February 2018. This machine is already in use. Thanks to Arduino, this control is applicable to the industry.
So I made an Android application and manual book: