I bought a 433MHz receiver and transmitter to send data from a Raspberry Pi 3 to an Arduino Uno.
I searched the internet for tutorials, Arduino StackExchange and Raspberry Pi StackExchange but I did not find anything helpful.
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You could try my implementation of VirtualWire to send small data packets between a Pi and an Arduino.
Class to send and receive radio messages compatible with the Virtual Wire library for Arduinos. This library is commonly used with 313MHz and 434MHz radio tranceivers.