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
Step 2: Add Wires to the Switch on the Transmitter
Take two small piece of wire (at least three inches long) and strip the insulation off both ends. Then solder one wire to each side of the button. If your button has four terminals, you need to solder the wires to two terminals that are not connected when the button is not being pressed. You should use a multimeter to check which terminals are normally connected and which ones aren't.