<p><strong>D</strong>esign of Smart Home Automatic Control with Communications Via Bluetooth HC-05-Based Microcontroller Arduino and Android, will provide all the comfort, safety, security and energy savings, which takes place automatically and programmed via microcontroller, the house or building. Design of Smart Home Automatic with Control Communications Via Bluetooth HC-05-Based Microcontroller Arduino and Android is intended for automatic control processes.</p><p>The system consists of seven sensors, keypad password for security doors, HC-05 Bluetooth GSM alarm application and device control applications aktuaktor, and aktuaktor buzzer, dc motors, lights, fans and fan dc exhausting. Among these sensors is a PIR sensor to detect theft, sensor MQ6 to detect leakage of LPG gas and smoke from fires, sensor HC-SR04 ultrasonic for automatic garage doors, fire sensors to detect a fire, the sensor LM35 to detect the temperature of the room, when the room temperature is hot the fan will be on automatically, when the cold room temperature will shut off the fan and LDR sensor to detect the intensity of light during the day which turn the lights off automatically and vice versa, thus saving energy. Homeowners can also control lights and monitoring sensors with android phones that are connected with communication via Bluetooth HC-05 microcontroller arduino, and can receive GSM alarm application sensors such as calling and sms.</p><p>Test results are used UART communication data transmission between the microcontroller serial monitor monitor has an error of 0 % . HC - 05 Bluetooth can accept orders at the farthest distance of 11 meters . The fire sensor can work well when the fire was 1-10 cm . Sensor HC - SR04 is already working with an error rate of 0.3 %, so the accuracy of this tool by 100 % - 0.3 % = 99.7 % .</p><p><strong>Keywords :</strong> Security Door , Bluetooth HC - 05 , Microcontroller Arduino and Android , Application Control and Application GSM alarm.</p>

Perum Perumnas is a State-Owned Enterprise (BUMN) in the form of a Public Company (Perum). Perum Perumnas has 7 regional business areas and 1 rusunawa regional area. Perum Perumnas Regional V which is located at Jl. Wilis No. 23 Semarang is engaged in providing housing and settlements for the middle class community. In its business activities, Perumnas sells houses to the public with cash payment methods or through Home Ownership Credit (KPR). The Perumnas Branch can serve every consumer who comes to Perumnas Branch to seek information about the amount of monthly installment payments if the consumer applies the mortgage system with the down payment that the consumer has and the shortfall that must be paid. In carrying out this activity, the Perumnas Branch still uses the Microsoft Excel application.The problem that often arises at this time is the calculation of KPR between Perumnas Semarang Branch I and Perumnas Semarang Branch II which is quite different, making it less effective for companies. Based on this description, the author tries to provide a solution that is able to overcome these problems by designing a website-based mortgage calculation simulation system at Perum Perumnas Regional V with the aim of making it easier for consumers and marketing or sales parties to find information about mortgage calculations.Making this simulation system, the author uses the HTML, CSS, PHP, JavaScript and MySQL programming languages ??as the database. In its manufacture, this application is adapted to the needs of Perumnas in general.The conclusion that can be drawn is the dissimilarity or difference in filling out the mortgage calculation where the Semarang Branch I and Semarang Branch II when the marketing staff does the mortgage calculation even though they use the same bank Suggestions that can be put forward is to create a mortgage calculation simulation system that can make it easier for consumers to get information about mortgage calculations quickly, efficiently and accurately and can be accessed anywhere and anytime.