This cheap pair of radio modules (transmitter FS1000A and receiver XY-MK-5V) can be bought lots of places online, and all the hard work of using them (at least for Arduino) has been provided in the RadioHead library.
I connect a couple of Arduinos (Mega and Nano) and transmit a message in the 433MHz ISM band.
RadioHead library: www.airspayce.com/mikem/arduin...
My video on serial communciation: • Tutorial: Serial Commu...
The source code featured in the video is on my github page: github.com/magiccow/ook
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