SISTEM KEAMANAN KAMPUS DENGAN MULTIUSER
Security systems are strongly needed in various aspects of life, from living quarters to work environments. Along with the increasing number of thefts, Indonesian Muslim University campus is trying to improve its security system. However, the conventional security system that is already applied, is still considered to be less than optimal because it is not proportional to the extent of the working area. Under these circumtances, an equipment is needed that can provide a fast response. Therefore, a multiuser security system was developed. This security system can automatically work maximum and sound an alarm, when the sensor detects a moving object. The test results of the barrier distance with the HCSR-04 ultrasonic sensor are quite good with an error value of around 3%. The NRF24l01 tool module has a transmitting and receiving distance of 30m without obstructions. If objects detected by sensors installed in spaces in the room, the receiver circuit at the security post will set alarm on and display that room code on the LCD.