Abstract Recording invited guests in registering guests is one of the potential physical contacts that can increase the spread of the virus, especially Covid-19, whether it is at wedding receptions, aqiqah, or counseling events, where guests write attendance data in a limited guest book using a pen that each other and cause queues. Therefore, researchers conducted research by creating a web-based online guest book which is expected to help reduce physical contact between invited guests who are present when the queue is filling out the guest book and those who hold an event are also easy to mark the presence of invited invited guests. This online guestbook application is built on a web-based basis and applies qr code technology using the PHP Native programming language. This application is designed using UML, and the database is MySQL, as well as for the testing method used the blackbox testing method. The application was successful in testing and implementation, where the results were that the application could help the invited guests in filling out the guest book, no need to write names manually, only by bringing a smartphone/mobile phone to scan the qr code the invited guests were able to fill in the guest book. The application can minimize the occurrence of physical contact between invited guests which can reduce the spread of the Covid-19 virus. Keywords: Guestbook Application, QR Code, PHP Native, Invitation, Web, Wedding Reception   Abstrak Pencatatan tamu undangan dalam mendata tamu merupakan salah satu potensi kontak fisik yang bisa meningkatkan penyebaran virus terutama Covid-19, baik itu pada pelaksanaan resepsi pernikahan, aqiqah, maupun acara penyuluhan, dimana para tamu menulis data kehadiran di buku tamu yang terbatas dengan menggunakan pena yang saling bergantian dan menyebabkan antrian. Maka dari itu peneliti melakukan peneltian dengan membuat buku tamu online berbasis web yang diharapkan dapat membantu mengurangi kontak fisik antara tamu undangan yang hadir ketika antrian dalam mengisi buku tamu dan yang mengadakan suatu acara juga mudah dalam menandai kehadiran tamu undangan yang diundang. Aplikasi buku tamu online ini dibangun berbasis web dan menerapkan teknologi qr code menggunakan Bahasa pemrograman PHP Native. Aplikasi ini dirancang menggunakan UML, dan basis data nya adalah MySQL, serta untuk metode pengujian yang digunakan metode blackbox testing. Aplikasi sukses dalam pengujian dan penerapannya, dimana hasilnya aplikasi dapat membantu para tamu udangan dalam mengisi buku tamu tidak perlu menulis nama secara manual, hanya dengan membawa smartphone/handphone untuk scan qr code tamu undangan sudah bisa mengisi buku tamu. Aplikasi dapat meminimalisir terjadinya kontak fisik antara para tamu undangan yang dapat mengurangi penyebaran virus Covid-19. Kata Kunci : Aplikasi Buku Tamu, QR Code, PHPNative, Undangan, Web, Wedding Reception

Abstract The development of advanced Information Technology by greatly improving human thought patterns. This home security problem can be overcome with a security system that can be delivered to homeowners via SMS notification (Short Message Service) compilation of plow sensors accepting people who enter the compilation house when it is installed and the system is in standby and the alarm will sound and the sound module has been designed to provide information about the movement in the house. To minimize this crime, the need for tools that can help improve home security. Based on the overall system test results in accordance with the desired that the security system can be used in a supported system, where when the PIR sensor supports movement the buzzer will sound, the red LED lights up, the sound module issues the expected voice message and the GSM module will send a message to the homeowner's mobile number. PIR sensor will work optimally if the object is detected by humans with a maximum distance of 6 meters. While for animals (cats), the success is only 40%, and plants cannot be detected at all by the PIR sensor and the GSM module will send a verification message to the cellphone owner in less than 1 minute. This tool is more effectively used in a room that provides valuable items, for example in a room or other room.   Keywords: Alarm, Arduino Uno Atmega 328, Home Security, SMS Gateway, Sensor PIR   Abstrak Perkembangan Teknologi Informasi yang maju dengan pesat sangat mempengaruhi pola pikir manusia. Masalah keamanan rumah ini dapat diatasi dengan sebuah sistem keamanan yang dapat memberitahukan kepada pemilik rumah melalui notifikasi SMS (Short Message Service) ketika sensor pir mendeteksi adanya orang yang masuk kedalam rumah ketika rumah dalam keadaan terkunci dan sistem dalam keadaan standby dan alarm akan berbunyi serta modul suara yang telah dirancang dapat memberikan pemberitahuan bahwa ada pergerakan didalam rumah. Untuk meminimalisir kejahatan ini, perlu adanya sebuah alat yang dapat membantu menigkatkan penjagaan keamanan rumah. Berdasarkan hasil pengujian sistem secara keseluruhan telah sesuai dengan yang diinginkan yaitu security system dapat bekerja dalam satu system yang terintegrasi, dimana saat sensor pir mendeteksi pergerakan maka buzzer akan berbunyi, lampu led merah menyala, modul suara mengeluarkan pesan suara yang sudah direkam sebelumnya dan modul GSM akan mengirimkan pesan kepada nomor handphone pemilik rumah. sensor PIR akan bekerja maksimal jika obyek yang dideteksi adalah manusia dengan jarak maksimal 6 meter. Sedangkan untuk binatang (kucing) keberhasilannya hanya 40%, dan tumbuhan sama sekali tidak dapat dideteksi oleh sensor PIR dan modul GSM akan mengirimkan pesan peringatan kepada handhphone pemiliki rumah dalam waktu kurang lebih 1 menit. Alat ini lebih efektif digunakan diruangan yang privasi yang terdapat barang-barang berharga, misalnya diruangan kamar atau dirungan lainnya.   Kata Kunci : Alarm, Arduino Uno Atmega 328, Keamanan Rumah, SMS Gateway, Sensor PIR

Digital and technology or a tool that is currently almost always there in every aspect of human life that has a goal to help and facilitate work or activities carried out by humans. The impact of digital technology is felt, especially for those who depend on technology for their daily activities. Digital businesses are currently growing and developing very quickly. To build a digital business requires adequate experience and knowledge, and to get this it is enough to take part in training. Training should be carried out early or starting at the school level, especially training for Vocational High School (SMK) students, because SMK students after graduation are targeted to be able to work immediately. The results of this training can be seen from the post-training questionnaire that participants