One of my earliest projects was making an “IR to RF bridge” with an Arduino Uno to be able to use my Harmony remote to control my RF controlled projection screen. Luckily both the IR receiver and the RF transmitter fit inside the Arduino case. Today you can build one much cheaper and easier using an ESP32 and ESPHome.

The harmony also controlled the lights of course (directly via IR dimmers).

Original remote disassembled

Arduino Uno and sensors (+ a shield that was too big to be used)

RF transmitter

IR receiver

Everything connected and enclosed in a nice transparent case: