Long Rang Access (LoRa) merupakan bagian dari teknologi Low Power Wide Area Network (LPWAN) yang banyak digunakan karena memiliki karakteristik berdaya rendah dan dapat menjangkau area yang jauh secara nirkabel. Pada penelitian ini telah dilakukan penerapan komunikasi nirkael LoRa pada sistem pencatat kehadiran portabel yang dapat digunakan dosen dan dan karyawan serta mahasiswa dalam merekam presensi saat beraktifitas di luar ruangan. Setelah dilakukan instalasi dan konfigurasi, dilakukan pongujian baik di dalam maupun di luar area kampus Politeknik Negeri Batam. Terdapat sembilan titik lokasi pengujian di dalam area kampus dan delapan titik lokasi pengujian di luar area kampus. Dengan menggunakan LoRa yang bekerja pada frekuensi 915 MHz, set SF=7 dan BW=125 KHz, didapatkan jangkauan terjauh hingga 456,01 meter. Keberhasilan penerimaan data dipengaruhi oleh jarak; banyak rintangan seperti beton, kaca, pepohonan dan gedung-gedung tinggi disekitar titi pengujian; frekuensi; dan bentuk antenna. Secara umum, komunikasi nirkabel LoRa dapat diterapkan pada sistem pencatat kehadiran portabel, namum masih terdapat ruang untuk pengembangan kedepannya terutama pada optimalisasi area jangkauan.
In 2018, Batam State Polytechnic has carried out community service in the village of Pasir Panjang, Rempang Island. Pasir Panjang village is one of the villages that is still not electrified by the local electricity company. The village also experiences difficulties in providing clean water because of its location on the coast. Therefore, the dedication of the Department of Electrical Engineering at the State Polytechnic of Batam in the form of grants and installation of water pumps for public facility with an independent power source from a 100WP solar cell. The problem arises when after carrying out the installation, the water pump cannot pump water properly. In the following year, the service was continued by making improvements to the electrical installation system. Starting from the analysis of the causes of system failure to repair. From the analysis and observation, it is known that the cause of the pump not working properly is due to a decrease in voltage because the Rs value in the solar cell system is quite large. By changing the cable size for current distribution, this problem can be resolved.
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