MQTT,USB,RS485,GPIO between arduino and RPI?

Hardware Server
1

Hi
I have 1 arduino which reads temperature and motion for each room in my flat(doing this way because rpi does not have analog input), then i have 1 arduino running running my bar mechanism, then i have one arduino controlling the led lights in my kitchen.

The sensor arduino is next to rpi, 20cm away, the other two are 20m away, but i have 4 wire running to them as well as ethernet outlet not far from them. Since I have cable to to the arduinos, and since they need power i dont see the point of using wireless communication to the rpi, am I wrong here?

The question is then how should I connect the arduinos to the rpi, should i use i2c, serial, usb, ethernet,rs485? It would be nice if I dont have to run out and get a lot of bulky ethernet shield, but can keep using the arduino nano.

Can anyone give me cons /pros for differnet solutions? and also point me to a webpage with the setup?

Thanks

2

Maybe Souliss or MySensors (RS485 currently in testing stage) may be something for you.

3

Yeah been looking at those, dont know which ones are better than the other, it seems like more people are using mysensor, but thar souliss is easier.

4

Hi,
Did you find any solution?

5

The one closest to the RPI i would use USB (or add a analog i/o expander to the raspberry pi). the other two. i would suggest to use RS485. but you do get extenders that enable you to use i2c over those distances.

you could even use mqtt and network by adding a network shield to them ?

https://www.wiznet.io/arduino/ethernet-shield/