In this post, we are going to copy and send a 433 MHz signal. The signal source is a garage key fob, as these signals don’t have encryption

Garage door openers primary operate on 433 MHz frequency band. The technology of these fobs is very basic and crude, and have no security or encryption in place.

This post describes the use of an ultrasonic sensor to measure distance of a target. The goal of this post is to help you understand how this sensor works