Judul: Desain Kontrol dan Monitoring Kondisi Udara Ruang pada Sistem Controlled Atmosphere Storage Berbasis Mikrokontroler Arduino Uno
Abstrak: Penyimpanan dengan cara pengaturan komposisi udara atau pengaturan konsentrasi oksigen dan karbondioksida dikenal dengan penyimpanan dengan pengendalian atmosfer. Teknik atmosfer terkendali sekitar produk bertujuan untuk mengendalikan metabolisme produk segar sehingga masa simpan dapat diperpanjang. Konsentrasi oksigen dan karbondioksida disekitar produk dijaga pada suatu konsentrasi yang diinginkan. Penelitian ini bertujuan untuk merancang sistem kontrol dan monitoring oksigen dan karbondioksida serta suhu dan kelembaban di dalam ruang penyimpanan dengan mengimplementasikan mikrokontroler Arduino Uno. Bahan yang digunakan adalah brokoli sebanyak 5 kg, gas nitrogen, oksigen dan karbondioksida. Peralatan yang digunakan adalah mikokontroler Arduino Uno, sensor SHT11, sensor CDM4160-H00, sensor KE-25, solenoid valve, solid state relay, chamber berukuran 40 x 40 x 50 cm dengan tebal 8 mm, refrigerator, peralatan perbengkelan dan peralatan pendukung lainnya. Pendekatan rancangan terdiri dari dua jenis yitu rancangan fungsional dan rancangan struktural. Fungsi dan struktur utama dari sistem yang dibuat adalah sistem pengontrolan terhadap injeksi gas, buka tutup solenoid valve, mengontrol lama injeksi, dan melakukan pembacaan sensor. Pengukuran dan pengujian meliputi kalibrasi sensor dan pengujian fungsional kinerja kontrol dan monitoring kondisi dengan beban dan kondisi tanpa beban. Analisis hasil percobaan dilakukan dengan menggunakan analisis statistik repeated measures ANOVA. Hasil pengamatan dan pengukuran kondisi suhu tanpa beban adalah 9.88ºC, RH 73.73%, karbondioksida 2.22% dan oksigen 4.63%. Hasi pengamatan dan pengukuran kondisi suhu kondisi dengan beban adalah 11.91ºC, RH 70.66%, karbondioksida 2.48% dan oksigen 6.38%. Perbandingan antara setpoint dan aktual diperoleh akurasi suhu 98.84% untuk kondisi tanpa beban dan 80.85% untuk kondisi dengan beban. Perbandingan antara setpoint dan aktual diperoleh akurasi RH 97.55% untuk kondisi tanpa beban dan 91.95% untuk kondisi dengan beban. Perbandingan antara setpoint dan aktual diperoleh akurasi oksigen 83.98% untuk kondisi tanpa beban dan 40.25% untuk kondisi dengan beban. Perbandingan antara setpoint dan aktual diperoleh akurasi karbondioksida 74.26% untuk kondisi tanpa beban dan 82.74% untuk kondisi dengan beban.
Keyword: CAS, Arduino Uno, oksigen, karbondioksida

Judul: Design and Build a Room Comfort Measurement Tool (Thermal and Visual) Based on Arduino Uno
Abstrak: Perkembangan teknologi di bidang mikrokontroler yang semakin maju dan sifatnya yang opensource memudahkan pengguna dalam mengaksesnya. Penelitian ini bertujuan merancang dan membuat alat ukur kenyamanan ruangan (termal dan visual) menggunakan mikrokontroler arduino uno. Penelitian dilaksanakan pada bulan April hingga Oktober 2022 dan berlokasi di Kota Medan dan Kota Bogor. Metode yang digunakan yaitu metode kuantitatif. Alat yang dibutuhkan pada penelitian ini adalah arduino uno, sensor DHT11, sensor BH1750, breadboard, LCD, I2C, box elektronika, kabel jumper, kabel USB, solder, RTC, baut dan mur, environment meter, dan adaptor. Penelitian diawali dengan mendesain prototype pada software Proteus 8 Professional, kemudian implementasi hardware, programming, dan pengambilan data untuk keperluan kalibrasi alat. Nilai rata-rata persentase error pembacaan sensor parameter suhu, kelembaban relatif dan intensitas pencahayaan berturut-turut bernilai 1,56%; 2,95%; dan 0,76%. Sementara itu, menggunakan extension berturut-turut bernilai 1,74%; 2,73%; dan 1,31%. Hasil tersebut menunjukkan alat monitoring yang dibangun dapat beroperasi dengan baik karena nilai pembacaan mendekati sebenarnya., Technological developments in the field of increasingly advanced microcontrollers and their opensource nature make it easier for users to access them. This study aims to design and create a measuring instrument for room comfort (thermal and visual) using the arduino uno microcontroller. This research was conducted from April to June 2022 and is located in Medan City and Bogor City. The method used is quantitative method. The tools needed in this research are arduino uno, DHT11 sensor, BH1750, breadboard, LCD, I2C, electronics box, jumper cable, USB cable, soldering iron, RTC, bolts and nuts, environment meter, and adapter. The research begins with designing a prototype on the Proteus 8 Professional software, then hardware implementation, programming, and data collection for tool calibration purposes. The average percentage error of temperature sensor readings, relative humidity and lighting intensity are 1.56%, 2.95%, and 0.76%, respectively. Meanwhile, using extension is 1.74%, 2.73%, 1.31% respectively. These results indicate that the built monitoring tool can operate properly because the reading value is close to the actual.
Keyword: room comfort, arduino uno, sensor DHT11, sensor BH1750

Judul: Phylogeography and Species Limits in the Papuan White Snake (Micropechis ikaheka) (Reptilia: Serpentes: Elapidae)
Abstrak: Papua white snake, Micropechis ikaheka, has been distingushed into two subspecies M.i. ikaheka and M.i. fasciatus. However, due to lack of data on their morphology, distribution and ecology, both subspecies often ignored in scintific discussions and refers only byas , Micropechis ikaheka. This study was designed to document the differences between M.i. ikaheka and M.i fasciatus by using scales characteristics and reproductive organ or hemipenes. The study also examine, zoogeography, habitat, diet and cannibalism of both subspecies to better understanding the the ecology of one of the most venomous snakes in the world. This study consists of three topics with method and also different in the size samples, respectively. The first study is the histology and microtopography of the skin were studied using paraffin method and Scanning Electron Microscope (SEM). The second is the hemipenis were examined by following Myers and Cadle (2003), and Zaher and Prudente (2003). The third is the abdominal surgery was carried out to document diet type and the investigate phenomenon of cannibalism in the snake. Specimens for this study came from the collection from Museum Zoologicum Bogoriense (MZB) and Universitas Negeri Papua’s Laboratory (LZU). The research result also indicated that the markers of skin and hemipenis described the same structure and microornamentation in all M. ikaheka groups being compared. Based specimens examined morphological descriptions do not s support the further differentiation in Micropechis. In short, two markers that used in this study could not sufficiently indicate the differences in the level of species and subspecies of M. ikaheka. The study, however, were able to delineate zoogeography and skin color patterns, which fall into four groups: M. i. ikaheka; M. i. fasciatus. M. i. ssp. “intermediate”; and M. i. ssp “black”. This study also revealed that color variations did not overlap in their geographic distribution. It is therefore, it suggested that environmental factors may contribute to the skin color variations. It also assumed that habitat discontinuous and biogeography factors may also cause the loss of the connection between the original populations (vicarians) or follow colonization events (dispersal). The examined of 22 stomach contents of M. ikaheka shows this species is carnivorous, and prey on vertebrates such as amphibians, fish, reptiles, and Mammals. These snakes are opportunistic predators since they prey on all that can be captured, but mainly reptiles (61.5%), followed by mammals and fish (both 15.4%), and amphibians (7.7%). Although categorized as terrestrial animal, the diet study showed that M. ikaheka snakes often go into the water to hunt for fish (the sample from Yapen island), including eel (the sample from Aru island). Based on prey items indentified, there is evidence that M. ikaheka is cannibal. At this time, there still no record on reason for cannibalism, but it is assumed that cannibalism was due to competition between populations and means to control population.
Keyword: geographic variation, white snake, papua