Perkembangan teknologi jaringan komputer saat ini begitu cepat dan pesat, baik perangkat keras maupun perangkat lunak, seiring dengan perkembangan perangkat keras dan perangkat lunak jaringan telah benar-benar berubah, yang dulunya banyak menggunakan kabel, kini dalam perkembangannya banyak dibangun jaringan tanpa kabel atau biasa disebut dengan Wireless Local Area Network (WLAN). Jaringan Wireless Local Area Network (WLAN) pada Balai Besar Pelatihan Kesehatan Jakarta digunakan untuk membantu menghubungkan komputer para pegawai, dan peserta sertifikasi agar bisa mengakses internet. Berdasarkan analisa penulis dalam jaringan komputer Balai Besar Pelatihan Kesehatan Jakarta, terdapat beberapa masalah jaringan komputer diantaranya mengenai, keamanan jaringan internet masih belum maksimal karena setiap karyawan dapat mengakses internet sosial media pada saat jam kerja sehingga mengganggu aktifitas kerja, dan belum diterapkannya keamanan jaringan berupa autentikasi untuk user yang akan menggunakan jaringan wi-fi. Oleh karena itu, diperlukan penerapan web proxy menggunakan router mikrotik guna memblokir situs media sosial dan situs streaming untuk menunjang aktifitas pada perusahaan. Untuk memberikan fitur autentikasi pada user yang akan menggunakan jaringan wi-fi perlu diterapkannya sistem hotspot login yang disediakan Hotspot Server pada Router Mikrotik.
Water is an important need for all living things, especially humans. Humans need water with quality that meets the physical, microbiological, chemical, and radiological requirements contained in the mandatory and additional parameters. The selection of these parameters is very important to meet the requirements of good water, namely tasteless, odorless, and colorless. Meanwhile, there are three parameters used for water identification, namely pH parameters, turbidity levels, and temperature parameters. From these problems, the authors examine the detection of water quality, especially water turbidity. The author tries to make a tool that can detect the level of turbidity of water with a turbidity sensor as a detector of the level of turbidity in the water, Arduino Uno as a processor for the data results that have been detected, and a 16x2 LCD as a display of turbidity level measurement results in the form of turbidity values and descriptions of the water being tested. The measurement range that can be detected by this tool is from 0 – 3000 NTU. The research method used is direct observation of the selected object, namely the author's home environment, and conducting library research related to the Arduino microcontroller. The purpose of this study was to determine and detect the level of water quality in the community. As one of the tools or alternatives for the community to find out or detect the level of water quality early.
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