Arduino + (unity, .., and other game engines)

arduino + unity:
https://www.alanzucconi.com/2015/10/07/how-to-integrate-arduino-with-unity/

https://medium.freecodecamp.org/you-can-now-create-an-arduino-and-unity3d-interactive-experience-without-latency-2d7388dcc0c

https://github.com/relativty/wrmhl#getting-started-%EF%B8%8F

https://medium.com/@yifeiyin/communication-between-arduino-and-unity-9fdcccc2be3f

http://www.aidanlawrence.com/diy-arduino-unity-motion-controller/