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This is a program for a security alarm system in TinkerCad based on a PIR motion sensor and reaction to any motion detected by the PIR motion sensor. The main idea is for the user to activate/lock a security system by entering a default passcode (Passcode: #) by using the keypad. When the system is activated, the green LED turns on and the program begins reading for a signal from the connected PIR motion sensor. If any motion has been detected, the green LED is then turned off and the program sends “Motion Detected!” message to the LCD display screen. This triggers the generation of an alarm tone on the buzzer along with the red LED turned on until no motion is detected anymore. When no motion is detected, only the system’s state “Armed” is displayed on the LCD display screen and green LED is on. The user can deactivate/unlock the security system by providing the second default passcode (Passcode: *) by using the keypad. If the system is not active the system’s state “Disarmed” is displayed on the LCD display screen. In this case, when the system is not active the program will not respond to the changes of the PIR motion sensor value.