I am trying to make a project that notifies me when I receive mail in my real mailbox. But as I live in a concrete building and the mailbox is about 100 meters away, what is the best RF solution?
I bought two HC-12 modules, after seeing test, it seems like they are not that good to penetrate building..
I just bought two SX1278, they might be right for me.. Do these need a library or can it be used via RX/TX and Serial.begin();?
What long rage module would you recommend when the signal needs to travel about 100-150 meters and through two buildings?