Initial Steps to begin RF timer app
You need to have two RF modules 433/315MHz. Connect one to an arduino and load the very simple sketch on it. The other can be connected to a raspberry pi using a USB FTDI serial connector. Ensure to configure the RPI to be able to read from the serial port. After loading the sketch on the arduino, run the python code on the RPI. Remember to change the port name to the one on the RPI.
And i think that's it