Here is the diagram of my Arduino infrared close proximity sensor. As you can see, the core part of my experimental setup is an Arduino UNO, but other compatible microcontrollers can also be employed.

[Ivan]’s LCD was ... The display featured no onboard controller, and the original driver wasn’t easily repurposed. Instead, [Ivan] decided to drive it directly from an Arduino Uno.

In the real world, missile systems use advanced radars, infrared sensors ... targeting data for the launcher, an Arduino Uno uses an ultrasonic sensor pair mounted atop a servo.