I`m trying to send a message over 433MHz with my raspberry pi

Link to hardware

Sender and Receiver are connected. Here is a Link to the tutorial I used to connect sender and receiver (Link)

wiring pi is installed and I installed 433Utils (Ninjablock) with this tutorial.

In short:

cd ~/
git clone git://github.com/ninjablocks/433Utils.git
cd 433Utils/RPi_utils

Simple problem .... it doesn't work. when using sudo ./RFSniffer CPU usage goes up to 99/100% but nothing happens. I am using different 433 MHz remotes (brennenstuhl and cheap china products) but I can't catch a signal.(Just to be clear: Startsudo ./RFSniffer and press different buttons on my different remotes next to the 433 Mhz receiver)

I don't think it's a hardware problem because I tried pilight and everything works fine. (Link

So my Problem is that the 433Utils software from ninjablocks does not work. Could this be because of the Pi version (3)?

  • How close to the receiver is the remote?
    – tlhIngan
    Jun 5, 2016 at 22:00
  • Very close. 5cm. It worked with pilight
    – Peter S
    Jun 6, 2016 at 5:45

2 Answers 2


Perhaps there is just too much radio noise.

Try my implementation at http://abyz.me.uk/rpi/pigpio/examples.html#pdif2__433D

It should use a lot less CPU.

It requires pigpio which may already be installed if you are using a recent Raspbian.

  • I'll try but I don't think it has something to do with too much radio noise, since the whole setup works with pilight I'll try your implementation
    – Peter S
    Jun 6, 2016 at 12:55
  • Thanks a lot.... This works like a charm. 5,6% CPU Usage :-) I'll recommend PIGPIO from now on :-) It's a shame that PIGPIO doesn't show up when I google raspberry pi and 433
    – Peter S
    Jun 6, 2016 at 14:07

There are some issues with the 433Utils if it doesn't recognize the protocol. You could try my toolkit which might help. Home Automation with 433MHz rf Nexa Sockets and the Blyss Wireless Doorbell

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.