DIY - Make an Alarm System in 3 minutes
Here’s a DIY on how to make an alarm system in 3 minutes. We will use a loud buzzer and some magnetic switchs from Radio Shack to create a simple yet effective alarm system. We will throw in a LCD, keypad so we can alarm the alarm system using a 4-digit code and be able to see the system status using the LCD.
DIY Link
DIY Link [html]
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looks interesting, but can you add more door sensors?
yes, you can add up to 49 door sensors if you wanted to.