Wireless reading information?

Question

Programming

1) What technologies exist besides intercom keys, NFC and RFID?
2) What are open source technologies? That is, allowing you to make equipment that your heart desires, for example, to make an auto light switch from an RFID kit, crossed RFID through a sensor, the light turned on (a simple example)
3) Ideal equipment for creating from scratch, for example, I could not find open source (point 2) and I wanted to create this from scratch, where to look? On which Russian sites can you buy such equipment?

Answer 1

On the Internet, there are a lot of schemes for peaks and atmels.
The source codes of the firmware are sometimes the same, I don’t know how you searched, but there is a radio cat and electronics on the same incident.
Judging by the questions, your way is to buy a ready-made reader based on the technology of interest and attach it to which thread of aurdina. True, the price will not please you.