Many of the receiver modules (MX-05V) working with the Virtual Wire library (I would like to add a link here but it requires 10 reputation, so I'll do that later) have two data pins. However only one of them is used in the examples I have seen so far.

This picture shows a transmitter (top left) and a receiver (bottom right). Apparently the receiver has four pins - two of them are data pins.

Transmitter and receiver module

Image source

What is the purpose of the second data pin on the receiver module and how to use it?

  • 1
    you can still put the part number of the module in your question. Someone might then edit your post and put in the data sheet.
    – Marla
    Commented Jul 9, 2016 at 15:01

1 Answer 1


I would expect only one data line output from the receiver.

Looks like the manufacturer might have just connected the 2 data pins together. You could try using either pin to confirm that the two data output pins are simply connected together.

enter image description here

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.