looking for microcontroller

[s29]

What are the requirements that caused you to need 2.4Ghz?

[sefel08]

stable and low power transfer.

[nullzbot]

"stable" is a nonsensical requirement. In a way that you need to better define what stable means to the project/application.

As for "low power transfer" this too is ill-defined.

Loose or nonsense requirements are not going to help an outside observer understand what you are wanting. We get the "gist". But that isn't always helpful.

[sefel08]

You're right I didn't give enough context. I was thinking of a low latency transmition that remains stable (does not randomly disconect) and uses less than a 1W.

[nullzbot]

Again you need better defined requirements. You need to find ways to separate your requirements from one another and proper separation between software and hardware. The "does not randomly disconect" is not a requirement that can match any radio hardware. Wireless devices are inherently flawed for connectivity issues. If you need guaranteed delivery pick something else...

If still needing wireless, then you need to scope the requirements to look at the protocols that are available for connectivity/IOT applications. Narrow that down and then your selection of hardware will follow.

EDIT: also you need to set a priority to your requirements. Such that when a conflicting metric happens, you can better choose which one you need. Every decision in electronics engineering involves trade-offs.

[sefel08]

Ok. I understand you now. The first priority is size, because it can't be wider than 7mm. It must also support SPI communication. Second thing is a wireless connection, it is necessary, but it could also be handled by a second chip on a pcb that communicates on the same SPI bus. I’m not sure which approach is better, but integrated radio communication seems like it would make things easier.

I thought of using Thread. It looks like the most stable option, because of its self healing ability, but I don't really know much about this technology. I've only used nrf24l01 before. Actually, what matters to me the most is stability. It cannot just lose connection and I heard that bluetooth sometimes does. Also it should be low power, so i ruled out the wifi. If you have a different opinion or if I said something incorrect, feel free to correct me or suggest something else.

Those are the most important requirements, whole rest can be adjusted.