Raspberry Pi 433MHz

Posted on Tue 19 June 2018 in RaspberryPi

I wanted to be able to send 433 signals to my plug sockets and light switches from the Raspberry Pi. I had a Pi 2b and some time spare.

After spending a few hours doing the usual research, I came up with the below, essentially;

• Hookup 433 Receiver/Transmitter
• Install WiringPi
• Install 433Utils
• Record Remotes
• Create Python Scripts
• Link py scripts to webpage buttons

These are my notes, they aren't exact. I have referenced useful pages.

Hook a 433 Transmitter/Receiver to the Pi

Good Guide: 433MHz

I had a pair laying in a draw. I don’t remember where I got them, most likely eBay. They won't have been expensive.

Google 433 transmitter receiver raspberry pi.

They look like this:

alt text

I cant find where the GPIO pins are defined, however the below is referenced online often and worked.

Receiver

Ground PIN 6 GND

Data PIN 13 GPIO27

VCC PIN 4 5v

Transmitter

Ground PIN 9 GND

Data PIN 11 GPIO17

VCC PIN 2 5v

Install WiringPi

cd /

git clone git://git.drogon.net/wiringPi

cd wiringPi

sudo ./build

Install 433Utils

cd /

sudo git clone git://github.com/ninjablocks/433Utils.git

cd 433Utils/RPi_utils

sudo git submodule init

sudo git submodule update

sudo make

Run 433Utils

Run RFSniffer, point your remote at the receiver, one second pushes, one code per push.

record codes
    /433Utils/RPi_utils/RFSniffer

send recorded code
    /433Utils/RPi_utils/codesend 16604184

Python Script

socket1_on.py
    import os

    os.system ("/433Utils/RPi_utils/codesend 4527445")
Socket1_off.py
    import os

    os.system ("/433Utils/RPi_utils/codesend 4527444")

Webpage Links

I host a webpage with buttons on it. The buttons link to php scripts which call the python scripts.

Socket1_on.php
    <?php
    system("sudo python /pihome/public_html/socket1_on.py"); header("Location: http://192.168.1.100:4556/remote.php");
    ?>
Socket1_off.php
    <?php
    system("sudo python /pihome/public_html/socket1_off.py"); header("Location: http://192.168.1.100:4556/remote.php");
    ?>