This paper developed a water-surface robotic vehicle that act as repeater station to assist the communication between ROV (Remotely Operated Vehicle) underwater robot and control station. The key issue here is how the robot can relay the data communication between the ROV and the control station. The communication between repeater Station and control station is based on wireless, whereas the communication between repeater Station and ROV is based on wire. Data that have transmit from control station is received by Repeater Station and continued to the ROV through wire. The Power needed is suplied by photovoltaic (PV) to the Repeater Station and the ROV. The position of Repeater Station is controlled, so the position of Repeater Station and ROV always in parallel. In practices, there are two way directly communication between control station with ROV, that are based on wireless and through wire. Nevertheless, wireless communication system never used to observed on the ocean or the deep waters because there is a high attenuation of a signal when cross the air-water boundary. Based on these problems, we make a Repeater Station that used a buoyant communication system models. Communication from control station to Repeater Station in the form of motion control and data. Whereas, communication from Repeater Station to ROV in the form of motion control, data, and power supply. Communication frequency is at 5,8 GHz for audio video and 433 MHz for motion control and telemetry. The connection wire between Repeater Station and ROV can go along and shorten with automatically roll as feature. Electricity from PV is strorage to a battery in the Repeater Station. Charging of the battery occur when battery power is not full and will cease if battery power is being full. Power of the battery must be full if want to operated the Repeater Station. The availability of the Repeater Station is expected to assist the communication between ROV underwater robot with control station, so ROV can be controlled remotely and can increase range of the reach.

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Abstrak - Tujuan penelitian ini adalah membuat sistem monitoring ruangan yang berfungsi untuk memantau keberadaan api di dalam ruangan, dan membuat robot yang bisa  memadamkan api secara otomatis berdasarkan hasil monitoring ruangan dengan memanfaatkan flame sensor yang digunakan untuk mendeteksi api di dalam ruangan dan memanfaatkan komunikasi bluetooth untuk mengirim informasi dari ruangan ke robot.Penelitian ini dilakukan dengan menggunakan metode penelitian dan pengembangan (Research and Development) yang meliputi perencanaan, analisis kebutuhan perancangan, pengujian, implementasi perangkat keras (Hardware) dan implementasi perangkat lunak (Software). Hasil dari penelitian menunjukan bahwa robot line follower pemadam api memanfaatkan flame sensor dan bluetooth berbasis Arduino yang telah dirancang sebelumnya berhasil dibuat, dan robot line follower pemadam api memanfaatkan flame sensor dan bluetooth berbasis Arduino ini sudah di coba di track yang mempunyai permukaan yang rata dengan ukuran 3m x 3m dengan 3 prototype ruangan berukuran 90cm x 60cm yang berada di dalam ruangan yang tidak tertembus cahaya matahari dan dengan api yang berasal dari nyala lilin. Pada saat tidak ada api di ruangan robot akan dalam kondisi diam di start dan saat ada api di ruangan, maka robot dapat langsung memadamkan api di ruangan yang terdeteksi terdapat titik apinya secara otomatis. Kata-Kata Kunci: Robot Line Follower, Robot Pemadam Api, Flame Sensor, Bluetooth, Arduino.   Abstract - The purpose of this Researh is to Create a monitoring  Room system that serves to monitor the presence of fire in the room, and make a robot that can extinguish the fire automatically based on the results of monitoring the room by using a flame sensor used to detect fire in the room and utilize bluetooth communication to send information From room to robot. This research is conducted by using research and development method which includes planning, design requirement analysis, testing, hardware implementation and software implementation.The results of the research show that the robot line follower fire extinguisher utilizes flame sensors and bluetooth-based Arduino that has been designed previously successfully made, and the robot line follower fire extinguisher utilizing flame sensor and bluetooth-based Arduino is already on the track that has a flat surface with the size 3m x 3m with 3 prototype room measuring 90cm x 60cm which is indoors indestructible sunlight and with fire coming from a candle flame. When there is no fire in room robot will be in silent condition at start and when there is fire in room, hence robot can directly Extinguish the fire in the detected room there is a fire point automatically. Keywords: Line Follower robot, Fire Extinguisher Robot, Flame Sensor, Bluetooth, Arduino.