The goal of this book is to implement sensors network system by supervising the state of the environment and the sensors at any building remotely with a mobile phone and to receive alerts on intrusion and movement around restricted premises. The goal was achieved successfully. The devices were controlled by using Arduino microcontroller and the alerts were received as an SMS. A hall effect proximity sensor and a passive infrared sensor and light sensor and distance sensor and vibration sensor and sound sensor were used as detectors to detect the intrusion and movement and the rest of functions to other sensors around and the restricted premises respectively.