Ben Let the Dogs Out: Electronic Door Build (1)

Ben makes a plan to create a secure dog door by hacking readily available parts. He decides to hack a key fob and a dog shock collar to work in the project. He tears the key fob and collar apart to find a way to interface them. Ben demonstrates how the 555 timer makes the project work. The circuit boards are stripped down and combined to fit into a small enclosure that will go on a collar.