@Nca78 Yes, I was actually thinking using DIP switch (or even more easy to read thumbwheel switch) to give a unique ID to each node! As soon as I receive the extra radio modules I ordered, I'll test that.
@Grubstake I'm afraid you're right! But it's ok to have just a few days of battery life. As I wrote, it might be often disassembled and reassembled.

Thank you LastSamurai, I'll dig into the ESP8266.
But for my needs, does it make sense to wish for a software solution that would merge the gateway and the controller into a single board, as it might save some power and some technical complexity? Or am I missing something?

Thank you for your answer. I think I wrote "controler" instead of "gateway". I indeed need some central device to coordinate all the nodes, but I'd prefer not to use raspberry. The reason is I'll have to use batteries to power everything up, to allow a very portative setup (I wish to install it in very remote places). But I think it's ok to use just an MCU like an arduino micro pro, to coordinate everything, isn't it?

Hello everyone!
I'm working on an experimental project based on wireless sensors and LEDs. From what I understand of MySensors it seems to be the right choice for this project. I'd just like to have confirmation from people with more experience in it before diving further into it.
Here are the project setup: there'll be a fleet of nodes, each node containing a motion sensor and a LED. Each sensor triggered will turn ON the LED of an other specific node. The whole node network has to be somehow autonomous.
I think I need a controller to get the sensors inputs and to tell the right node to turn its LED on.
But do I need a gateway, as I dont really need to monitor anything?
Also, this project might often be disassembled and reassembled elsewhere, and is meant to grow as I manage to build more nodes.
Does it make sense to use MySensors for this project?
I'd appeeciate any advice. Thank you!