Arduino Security and Alarm System Project

In this project we will learn how to make an Arduino Security and Alarm System. You can watch the following video or read the written tutorial below. The alarm activates in 10 seconds after pressing the A button. For detecting objects it uses an ultrasonic sensor, and once the alarm detect something a buzzer starts emitting a sound. In order to stop the alarm we need to insert a 4 digits password. The preset password is 1234 but we also have the possibility to change it. By pressing the B button we enter the password change menu where first we need to enter the current password in order to continue and then enter the new 4 digits password. Once the password is changed, the next time we activate the alarm, we will only be able to stop the alarm by entering the new password. If we enter a wrong password we will get a message that we need to try again.”