A tripwire is one of the most basic ways to set up a simple security system. You run a line across a pathway. Then when someone walks through the line, it activates an alarm. This kind of system is easy to set up and is fairly effective. But there is always room for improvement.
The most inconvenient thing about a classic tripwire alarm is that it requires you to run a physical line from the tripwire to the alarm. This makes it difficult to set up a system where the alarm is far away or inside a building. To get around this problem, I designed a simple remote alarm system that uses a small radio transmitter to activate the alarm wirelessly. So in this project, I am going to show you how to make a simple remote tripwire alarm.
Step 1: Select a Wireless Transmitter/Reciever
The first thing that you need to do is select a small transmitter to activate the alarm. Just about any radio transmitter can work. I decided to use a wireless doorbell because it was small, battery powered and it is easy to program them so that multiple transmitters can activate one receiver. Some other examples of transmitters that can also work are things like walkie ralkies or garage door openers.