Teknologi informasi sudah merambah ke berbagai bidang termasuk pendidikan, semakin berkembang teknologi informasi sekarang ini, maka kebutuhan akan informasi saat ini semakin meningkat pula. Saat ini setiap orang membutuhkan informasi dalam waktu yang cepat, singkat dan akurat oleh karena itu dibutuhkan sarana yang dapat mendukung teknologi informasi tersebut, salah satunya adalah koneksi internet. Pembuatan Hotspot ada beberapa hal yang sangat diutamakan, seperti pembagian bandwith, pembagian user serta kemudahan-kemudahan lain yang bisa meningkatkan kinerja dari SMKN 2 Selong.

Watermelon is one of the fruit commodities currently being developed in West Nusa Tenggara by making Central Lombok Regency as its production center. The problems that are often faced by farmers in watermelon farming, apart from pests, watermelon plants are also often affected by diseases that cause the plants to wilt and then dry, white spots on the flesh, the growth of leaves and small fruit so that it has an impact on decreasing productivity caused by lack of knowledge farmers in recognizing and dealing with diseases in watermelon plants so that they are often mishandled. This research was conducted with the aim of producing an expert system that can be used to detect diseases in watermelon plants and provide solutions for handling them so that watermelon farmers can make prevention and treatment efforts quickly before the disease is transmitted to many other watermelon plants. This expert system was built with the Mobile-based Certainty Factor Method with the Android operating system so that it can be downloaded in the Playstore by watermelon farmers or anyone who needs it so that it is expected to help farmers detect diseases in watermelon plants and provide appropriate handling steps based on related theories.