Abstract: In this work, an Arduino Uno based real time home security system using self-generated password protection scheme has been proposed. The main function of this security system is to detect the presence of human being and make the user alert about it whenever it is necessary, by sending text message to users mobile phone-number, registered previously. In the primary stage, presence of any human being will be sensed by a Pyroelectric (PIR) motion sensor and after that, the person will have to enter the right password through a keypad.