RF sensor network between multiple slaves and a master. Which transceiver?

Other Hardware Home Automation
1

I am looking for advice on how to create a rf network to send and receive data at once. The master arduino receives temperature readings from the slave nodes which passes it to a rpi to upload to a web interface.And the opposite happens for a command e.g. light on. I have already done the pi side as i have developed the web interface.

How would i get over the interference between the modules operating on the same frequency. So a message transmited by one receiver would be picked up by the other receivers in the other nodes but not the receiver in the node that it is sent from. I plan to append a sensor id so it only gets acted on by one node as the messages will be filtered.Either with an if statement. So it will scan every message it picks up for a destination id and if it is equal to its node id it will act on it overwise it will ignore it.It will all be in one building

My string formula for transmission will be"255:Sender Node id:Destination Id: command codes e.g. 02 to switch on relay: Sensor values"

range must be 100m(through thick walls and up a floor)

I want to keep cost low but not to buy of eBay because i want proper documentation and quick delivery times.

It must be an easy platform where the heavy lifting is done for me, it must be compatible with Arduino.

sorry if unclear as i am confused

Any other issues i need tot worry about?
thanks in advance
Daniel

2

Very confusing.
Are the nodes going to be outside or in buildings?
The range requirement of 500+ meters makes this kind of project extremely difficult unless you are prepared to buy costly transceivers.

3

Sorry
The nodes are going to be in one house (inside) but want to make sure it can reach from the bottom of the garden to the bedroom.So if it actually 100m plus through walls that will be okay. The 500m+ is line of sight taking in account of signal loss through walls. The longest distance the transmission will have to travel is 100m ( including up a floor and going through ceilings) approximately.

4

Tried to make it clearer and i am in the uk
mauried

5

bump

6

Very hard to give an answer thats guaranteed to work.
You could look at Xbees, but they are expensive.