https://www.instructables.com/id/Make-a-RF-Transmitter-and-Receiver-With-HT12E-HT12/
Make a RF Transmitter and Receiver With HT12E & HT12D : 4 Steps – Instructables was last modified: March 26th, 2020 by
Make a RF Transmitter and Receiver With HT12E & HT12D : 4 Steps – Instructables
Jovan Stosic