Help with selecting hardware, TX/RX communication

Projects General Guidance
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Hello,
I am looking to design a system and would like to get input from experts. The basic system diagram is outlined below. Looking for the smallest footprint possible. RF or Bluetooth communication. In summary: 1) Users inputs - device reacts over distance, 2) Device reacts without user inputs but based on signal received/captured. 3) Device just functions.

I am familiar with Arduino Mega, but the footprint is quite big for this project. I also have no experience with TX/RX boards.

I kindly ask for recommendation hardware and tech links reference,

Thank you

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ESP32.

All the deets, https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/index.html

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My first question would be what distance you need to cover? And if the signal has to go through walls or if there is clear line-of-sight?

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The Adafruit Feather series features a wide variety of processors, many with built in two way radios of one sort or another. They are all easy to program with the Arduino IDE, come with useful examples, and the libraries seem reasonably well thought out.

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Thank you started looking into this !

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thank you for the input, Distance won't be more than 5 feet, with lesser distance can be a wall obstruct,

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Thank you will look into this as well!

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I'm working on a similar project right now (as far as WiFi only needs to go about 5ft), and I have been using the Arduino Pro Mini and the ESP8266-01 with great results. These are a more budget-friendly option that still provides a lot of functionality.

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