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Based on statistical data, every year there is an increase in population. This also happened to the increasing number of Catholics. The increase member in Saint Aloysius Church of Mojosongo isn’t accompanied by an increase of seating facilities, to solved this, a device was designed which will show seats that have been used or still empty through a viewer that will be placed near the entrance. The research method used in this study is a quantitative method. The number of seats used by in one block is 25 seats, the seat sample is 9 seats. Three (3) PIR sensors are placed above the row to the seat 2, where the direction of the PIR sensor is drived by a stepper motor with an angle is 22.61°. Detection alternated and sequentially starting from row A, row B and row C. In general, the seat detection system based on ATMEGA16 works according to the design. People can find an empty seat position by looking at the viewer (LED) and looking for LED lights that are not lit.

The increase in motorized vehicles in urban areas is followed by an increase in cases of motorcycle theft due to the lack of public awareness about the motorcycle security system. The intensity of motorcycle theft with its disclosure is still far in comparison. Crime will also increase, such as cases of theft of motor vehicles, especially motorbikes. Cases of motorcycle theft still often occur, this happens because there is still a lack of security systems contained in motorized vehicles that only use ignition. the existence of an alternative safety system is needed because the average key of a conventional motorcycle is easily penetrated by thieves. A double motorcycle safety device (Doble Smart Lock) composed of an RFID and Personal Identification Number (PIN) and an ATMega microcontroller. This system serves to provide two-stage security. The first stage is a microcontroller in the form of a PIN and the second stage is an RFID system. If the first stage breaks then it will enter the second stage, namely the RFID system The results in the form of a main tool for motorcycle management consists of: Power supply, RFID Card, RFID Reader, Personal Identification Number (PIN), IC / Microcontroller ATMega and already running. The system testing process shows the number 3 in the expert validation test and the number 3 in the expert validation trial. Based on the above calculation, it can be concluded that the validation results from the expert show that the value of 3 is between 2 - 3, which is classified in the valid category. The system process shows the number 3 in the expert validation and the number 2.9 in the validation trial of the user. Based on the above calculation, it can be concluded that the validation results from the user point to a value of 2.9 between 2 - 3 which is classified in the valid category.