How to implement data exchange between 3 or more Arduinos?

Question

Arduino

Good day.
Actually, I asked myself the question of implementing the idea of ​​​​a smart home :)
With Arduino, I'm still on you, but I understand a little. There was a problem linking 2 Arduino Pro Minis to the master Arduino th UNO . I found several posts on how to implement this connection between the two via a 315 MHz radio channel , but there you need to hook up a receiver and transmitter to each board. As far as I understand, this can be done for 3, but then on the master board you need to attach 2 pairs (receiver and transmitter) and I'm not entirely sure that this is even possible. I would like to implement this idea is not expensive and efficient.
PS: All devices will be located within a radius of 2-50 metersindoors with thin walls.
I would appreciate any advice!

Answer 1

Thanks to everyone who responded to the call. I rummaged around on the Internet and found a very interesting article on this topic, where, using examples with code explanation, it is described how this idea can be implemented. I think everyone who asks the same question will be interested. ARTICLE

Answer 2

For each board - one pair of "transmitter + receiver". Assign an address to each board. The master polls all boards in turn (at the same frequency), indicating the address in the packet header. The board that heard its address answers the master, the rest are silent at this time.

Answer 3

Wagon and small cart options.
1. Radio channel (NRF24L01)
2. Bluetooth
3. WiFi
4. Ethernet
5. RST 485
6. RST232
7. X10
.......................
100500. Your idea with a 315 MHz radio channel is not the best option

Answer 4

The Rx of each arduino is connected to the Tx of the other. Each controller must have a code inside that will determine which messages are addressed to him personally.
This is the cheapest option. The more easy to debug