two seperate pairs of 433MHz RF modules interference?

Hi, I want to practice the basic working method of a 433MHz RF transmitter-Receiver. I have gone through some tutorials & demo codes. I have access to a pair of arduino UNO boards. I tried these sketches as well & they work as expected.

I want to know that if there is another pair of these 433MHz Tx,Rx chips communicating with each other in my RF module range, will it create any problems for my Tx,Rx pair to communicate with each other? Since I dont have another pair of arduino boards, I cannot demonstrate it myself. I am using the virtualWire library.


The two sets of modules will interfere with each other, because they are using the same frequency. However, if you make sure that your messages are short, infrequent and have a unique ID for each transmitter and for each message, then VirtualWire will report only the non-interfering messages. You need to devise a system to keep track of which message is from which transmitter.

If you need two way comms, then something like RF24L01 might be a better option.

I have the impression from your original post that you want to have two separate wireless conversations and the 2.4GHz wireless transceivers (such as the RF24, as far as I know) are designed for that - each conversation can be on a different channel and a pair of devices can search for a suitable empty channel. There is also good error checking.


Thanks jremington, Tack, Robin2 for your help. I have tried the unique is ID method, actually same transmitter sends 2 messages such as "A1" & "B1" as described in the tutorial page It works. Can you show me a way how to encorporate HT12D, T for encoding using RF433 modules? can't find any example with arduino with this setup.

I tried the nRF24l01+ communication. I tried really hard but the code seems pretty advanced so I thought of starting with the basic 433MHz modules & I fing these modules are really good to start with. In the mean time I think both the nRF modules are toasted due to my fault. I connected them with 5V supply. Someone in the youtube channel suggested that some nRF+ modules work with 5V instead of 3.3V. I did that & my modules are destroyed... :-( I have ordered another pair of nRF modules from the internet.