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<![CDATA[Pengembangan Prototipe Dan Pengujian Traktor Satu Roda Untuk Pemeliharaan Tanaman Padi ]]>
<![CDATA[Jusran Jusran]]>;
<![CDATA[Radite Praeko Agus Setiawan]]>;
<![CDATA[I Dewa Made Subrata]]>
<![CDATA[ Jurnal Keteknikan Pertanian Vol. 7 No. 2 (2019): JURNAL KETEKNIKAN PERTANIAN ]]>
Publisher : <![CDATA[PERTETA ]]>
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DOI: 10.19028/jtep.07.2.147-154
<![CDATA[Most of paddy fields in Indonesia are not consolidated, therefore, soil hardpan usually did not exist. With no soil hardpan, mobility of any machine for crop maintenance is very difficult even in some places is almost impossible.Until now crop maintenance such as weeding, spraying and spreading fertilizer was done manually by labor. Then mechanization is required to replace the labour which is not available or very expensive. Hence, this study conducted with objective to make a prototype II of a single wheel tractor for crop maintenance operated in deep mud field or in an unconsolidated paddy field. The study also did performance test of a single wheel tractor to measure the tractor speed, traction, sinkage, and slip of wheel when operated in rice plants field. The results of performance test showed that the speed average of wheel with straight lug and curved lug were 1.15km/hour and 0.97 km/hour. The average of sinkage and slip both of wheels with straight lug and curved lug respectively were 24.8 cm, 25.9 cm and 38.7 %, 26.12%. The results of performance test olso showed that the traction average of wheel with straight lug and curved lug respectively were 45.8 kg and 41.5 kg]]>
<![CDATA[Rancang Bangun dan Pengujian Penetrometer Digital dengan Perekam Data Berbasis Android ]]>
<![CDATA[Budi Priyonggo]]>;
<![CDATA[I Dewa Made Subrata]]>;
<![CDATA[Radite Praeko Agus Setiawan]]>
<![CDATA[ Jurnal Keteknikan Pertanian Vol. 7 No. 1 (2019): JURNAL KETEKNIKAN PERTANIAN ]]>
Publisher : <![CDATA[PERTETA ]]>
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DOI: 10.19028/jtep.07.1.83-90
<![CDATA[Abstract Static penetrometer is designed to measure the force that required to push a conical probe of the soil deepness through a constant velocity. The output data are force per unit area without soil factor influenced, i.e. soil moisture content. Soil moisture content is an important factor that affects soil penetration resistance. The soil moisture content method that commonly uses a gravimetric method can takes a long time to obtain data of soil moisture conten. Therefore a penetrometer is needed which can measure the soil moisture content at once. The objective of study is to design and develop static penetrometer equipped with soil moisture sensor and android based data record system. Loadcell and HX711 used as force sensor, HC-SR04 and DHT11 used as depth sensor and a kit soil moisture module has been modified as soil moisture sensor. Calibration and validation result of the sensor shown that the correlation value of R2=0.9994 and R2=0.9995 (force sensor), R2=0.9999 and R2=0.9999 (depth sensor) and R2= 0.9098 and R2=0.9255 (soil moisture sensor). Penetrometer performance test in land result obtained the value of R2=0.9583 for cone index, R2=0.9994 for depth sensor dan R2=0.6673 moisture content sensor. Penetrometer pervormance test in rice field result obtained the value of R2=0.9583 for cone index, R2=0.9941 for depth sensor and R2=0.7201 moisture content sensor. The result of regression anlaysis for moisture content equation obtained value R2=0.7201 for testing on dry land and R2=0.9058 for testing in the paddy fields. The experimental result shown that the new develop penetrometer instrument can be used as an alternative instrument to measure soil pentration that eqquiped with soil moisture content data.AbstrakPenetrometer statis didesain untuk mengukur gaya yang dibutuhkan untuk menekan probe kerucut kedalaman tanah dengan kecepatan konstan. Output datanya adalah gaya persatuan luas tanpa faktor sifat tanah lain seperti kadar air. Kadar air tanah merupakan faktor penting yang memengaruhi tahanan penetrasi tanah. Metode pengukuran kadar air yang umum menggunakan metode gravimetri yang membutuhkan waktu cukup lama untuk mendapatkan data kadar air tanah. Maka dari itu dibutuhkan penetrometer yang dapat sekaligus mengukur kadar air dengan baik. Tujuan dari penelitian ini adalah merancang, membangun dan menguji penetrometer digital dilengkapi pembacaan kadar air dengan perekam data berbasis android. Loadcell dan HX711 digunakan sebagai sensor gaya, HC-SR04 dan DHT11 digunakan sebagai sensor kedalaman dan kit sensor kadar air tanah termodifikasi digunakan sebagai sensor kadar air. Hasil kalibrasi dan validasi sensor didapatkan nilai R2=0.9994 dan R2=0.9995 untuk sensor gaya, R2=0.9999 dan R2=0.9999 untuk sensor kedalaman, R2=0.9098 dan R2=0.9255 untuk sensor kadar air tanah. Hasil pengujian kinerja di lahan kering secara terpadu di dapatkan nilai nilai R2=0.9583 untuk cone index, R2=0.9994 untuk sensor kedalaman dan R2=0.6673 untuk sensor kadar air. Hasil pengujian di lahan sawah didapatkan nilai R2=0.9583 untuk sensor gaya, R2=0.9941 untuk sensor kedalaman dan R2=0.7696 untuk sensor kadar air. Hasil analisis regresi pada proses kalibrasi ulang didapat persamaan penduga kadar air dengan nilai R2=0.7201 untuk pengujian di lahan kering dan R2=0.9058 untuk pengujian di lahan sawah. Berdasarkan data yang didapatkan maka penetrometer yang dirancang dapat digunakan sebagai alternatif instrumen ukur tahanan penetrasi yang dilengkapi dengan data kadar air. ]]>
<![CDATA[Rancangan Sistem Kendali Kelembaban Tanah Berbasis Mikrokontroler Arduino ]]>
<![CDATA[Joko Sumarsono]]>;
<![CDATA[Budi Indra Setiawan]]>;
<![CDATA[I Dewa Made Subrata]]>;
<![CDATA[Roh Santoso Budi Waspodo]]>;
<![CDATA[Satyanto Krido Saptomo]]>;
<![CDATA[Popi Rejekiningrum]]>
<![CDATA[ Jurnal Keteknikan Pertanian Vol. 7 No. 1 (2019): JURNAL KETEKNIKAN PERTANIAN ]]>
Publisher : <![CDATA[PERTETA ]]>
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DOI: 10.19028/jtep.07.1.17-24
<![CDATA[AbstractControl of soil moisture can save water supply for crops. The soil moisture sensor integrated with the Arduino microcontroller board can be programmed as the control system. Addition of RTC module and SD module tools also make the system as the data logger. The purpose of this research was to developed the irrigation automation system with the control of soil moisture. This system has been integrated with the automation system using the power source of solar energy. Soil texture is sandy clay loam, which is dominated by the sand content of 59.67%. Rainfall during the study was 58.5 mm. The control system with Arduino board, set to keep soil moisture between 0.23 cm3cm-3 - 0.30 cm3cm-3. The soil moisture in that range was able to be controlled with this system. Land without agricultural cultivation activities when water resources are limited, can be empowered with the application of irrigation automation systems.AbstrakPengendalian kelembaban tanah dapat menghemat pasokan air untuk tanaman. Sensor kelembaban tanah yang diintegrasikan dengan papan mikrokontroler Arduino dapat diprogram sebagai sistem pengendalian tersebut. Penambahan alat RTC module dan SD module juga menjadikan sistem sebagai data logger. Tujuan dari penelitian ini adalah untuk mengembangkan sistem otomatisasi irigasi dengan kendali kelembaban tanah. Sistem ini terintegrasi dengan sistem otomatisasi menggunakan sumber tenaga dari energi surya. Tekstur tanah adalah lempung liat berpasir, yang didominasi oleh kandungan pasir sebesar 59.67%. Curah hujan selama penelitian adalah 58.5 mm. Sistem kontrol dengan papan Arduino, diatur untuk menjaga kelembaban tanah antara 0.23 cm3cm-3 – 0.30 cm3cm-3. Kelembaban tanah pada kisaran tersebut mampu dikontrol dengan sistem ini. Lahan tanpa kegiatan budidaya pertanian pada saat sumber daya air terbatas, dapat diberdayakan dengan aplikasi sistem otomatisasi irigasi.]]>
<![CDATA[DISAIN DAN PENGUJIAN SISTEM KENDALI SUHU ASAP KAYU KARET UNTUK MENINGKATKAN EFEKTIVITAS PEMBUATAN KARET SIT ASAP BERBASIS MIKROKONTROLLER ]]>
<![CDATA[Suhermanto Agung Wibowo]]>;
<![CDATA[I Dewa Made Subrata]]>;
<![CDATA[Anjar Suprapto]]>;
<![CDATA[Lisyanto Lisyanto]]>
<![CDATA[ Jurnal Penelitian Karet JPK : Volume 35, Nomor 2, Tahun 2017 ]]>
Publisher : <![CDATA[Pusat Penelitian Karet - PT. Riset Perkebunan Nusantara ]]>
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DOI: 10.22302/ppk.jpk.v35i2.399
<![CDATA[Pengasapan karet RSS adalah metode pengawetan dan pengeringan karet lembaranmenggunakan asap kayu bakar agar jamur tidak tumbuh saat penyimpanan. Pada umumnya pengasapan karet RSS konvensional membutuhkan waktu 5-6 hari dan konsumsi kayu asap sebanyak 4 m3 per ton karet kering. Selain itu mutu RSS juga ditentukan oleh pengontrolan yang rutin mengenai bahan bakar kayu dan suhu ruang pengasapan. Penelitian ini berupaya meningkatkan mutu karet RSS dan efisiensi energi proses pengasapan karet RSS dengan menerapkan sistem kendali otomatis berbasis mikrokontroller yang dapat mengatur konsentrasi asap dan suhu. Sistem kendali ini merupakan sistem yang akan mengatur suhu dan kepekatan asap pada setiap tingkatan suhu. Tujuan penelitian ini adalah untuk melakukan perancangan dan pengujian pengendalian suhu dan konsentrasi ruang asap karet RSS menggunakan mikrokontroller. Prosedur penelitian ini mencakup; 1) Disain dan Konstruksi, 2) Merancang perangkat keras kendali, 3) Merancang perangkat lunak, 4) Kalibrasi Sensor LM 35 dan 5) Pengujian sistem kendali pada ruang pengasap. Hasil pengujian sistem kendali suhu dan konsentrasi asap adalah proses pengasapan karet RSS terbagi pada 4 tingkatan suhu yaitu suhu 400C-450C selama 12 jam, suhu 450C-500C selama 12 jam, suhu 500C-550C selama 12 jam, dan suhu 550C-600C selama 24 jam. Keberhasilan pengujian ini dicapai selama 60 jam atau 2,5 hari. Mutu karet RSS berwarna coklat transparan, tidak timbul gelembung dan lembaran tidak tambah panjang atau putus. Karet RSS menjadi dominan mutu RSS 1 setelah terjadi penguapan air sebesar 35,78%. Adapun panjang karet RSS berkurang sebesar 3,81%, lebar berkurang sebesar 8,95% dan ketebalan bertambah sebesar 4,36%. Penggunaan kayu bahan bakar asap sekitar 2 m3 dengan kapasitas karet RSS 1.000 Kg.]]>
<![CDATA[Low-cost nitrogen dioxide monitoring station based on metal oxide sensor and cellular network ]]>
<![CDATA[Rady Purbakawaca]]>;
<![CDATA[Arief Sabdo Yuwono]]>;
<![CDATA[Husin Alatas]]>;
<![CDATA[I Dewa Made Subrata]]>
<![CDATA[ Indonesian Journal of Electrical Engineering and Computer Science Vol 26, No 1: April 2022 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijeecs.v26.i1.pp105-115
<![CDATA[Air pollution has a negative impact on the environment and human health. Meanwhile, the number of conventional air quality monitoring stations is minimal due to high procurement and operational costs. This study proposes a nitrogen dioxide (NO2) pollutant measurement system using the metal oxide sensor (MOX) sensor and cellular network for data transmission in the measurement area. A calibration curve is used to measure NO2 levels based on the sensor's internal resistance changes. Measurement data of NO2 concentration, air temperature, relative humidity, and geospatial information are compiled and sent via global positioning system (GSM), general packet radio service (GPRS) radio communication with transmission intervals of every minute. The database server processes the data and displays it on the web application. System testing results at the Tugu Kujang Bogor at 15:38:00-16:38:00 September 23, 2021, showed that the concentration of NO2 ranged from 0.16-0.52ppm with an average of 270 ppb with an AQI of 133 in the unhealthy category for the sensitive group. The measured NO2 levels are outside the range of the NO2 concentration database in the industrial areas of Bogor and Jakarta for the 2016-2020 period. Therefore, this system provides an excellent opportunity to obtain real-time measurement data in the field.]]>
<![CDATA[PENENTUAN POSISI TIGA DIMENSI BUAH JAMBU KRISTAL MATANG MENGGUNAKAN PENGINDERAAN STEREO ]]>
<![CDATA[I Dewa Made Subrata]]>;
<![CDATA[Fuad Chalim Rusdana]]>
<![CDATA[ Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 10 No 1 (2022): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem ]]>
Publisher : <![CDATA[Fakultas Teknologi Pangan & Agroindustri (Fatepa) Universitas Mataram dan Perhimpunan Teknik Pertanian (PERTETA) ]]>
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DOI: 10.29303/jrpb.v10i1.329
<![CDATA[Pemanenan buah matang secara otomatis memerlukan penerapan teknologi yang mampu untuk mendeteksi keberadaan buah pada pohonnya. Buah matang yang memiliki warna hampir sama dengan warna daun seperti buah jambu kristal cukup sulit untuk dikenali. Penggunaan parameter warna untuk mengenali keberadaan buah perlu dikombinasikan dengan parameter lain yang menjadi ciri dari buah jambu. Buah jambu kristal matang memiliki ukuran yang lebih besar dari buah jambu muda sehingga pemilihan parameter luas area citra objek bisa digunakan sebagai alternatif. Selain mengenali keberadaan buah, posisi tiga dimensi dari citra buah juga merupakan faktor yang sangat penting untuk penerapan robot pertanian. Tujuan dari penelitian ini adalah untuk mengenali keberadaan buah matang berdasarkan kombinasi warna dan luas area citra objek serta menentukan posisi tiga dimensi buah menggunakan kamera stereo. Tanaman jambu kristal dalam pot yang sudah berbuah diambil citranya menggunakan kamera stereo kemudian citra tanaman yang didapatkan diolah untuk memisahkan citra buah dari komponen lainnya. Citra buah hasil pengolahan citra kemudian dihitung posisi tiga dimensinya menggunakan prinsip triangulasi. Kamera stereo diletakkan pada rentang jarak antara 30 cm sampai 70 cm terhadap tanaman dengan empat perlakuan jarak antar kamera, yaitu 8 cm, 10 cm, 12 cm, dan 14 cm. Hasil pengujian dengan jarak kamera yang berbeda menunjukkan rata-rata ketelitian mengenali buah 90,38% dan ketelitian penentuan posisi tiga dimensi adalah 99,3%, 99,3%, 98,8%, 98,7% secara berurutan.]]>
<![CDATA[Pengembangan Sistem Pendeteksi Mutu Buah Tomat Cherry Berdasarkan Warna Menggunakan Sensor Optis TCS230 ]]>
<![CDATA[I Dewa Made Subrata]]>;
<![CDATA[Achmad Zurhafidz Ramadhan]]>;
<![CDATA[Agus Sutejo]]>
<![CDATA[ Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 10 No 2 (2022): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem ]]>
Publisher : <![CDATA[Fakultas Teknologi Pangan & Agroindustri (Fatepa) Universitas Mataram dan Perhimpunan Teknik Pertanian (PERTETA) ]]>
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DOI: 10.29303/jrpb.v10i2.389
<![CDATA[Tomat cherry adalah salah satu jenis tanaman yang kematangan buahnya mengalami perubahan warna dari warna hijau menjadi merah. Buah tomat cherry sangat digemari di kalangan masyarakat karena rasanya manis keasaman. Mutu buah tomat cherry ditentukan berdasarkan warna dan umumnya dipasarkan dalam tiga kelas mutu, yaitu tomat hijau, oranye, dan merah. Penelitian ini bertujuan untuk mengembangkan sistem pendeteksi mutu buah tomat cherry berdasarkan warna menggunakan sensor optis TCS230 dan mikrokontroler Arduino Mega 2560 sebagai pengolah informasi. Sistem pendeteksian tomat cherry dirancang menggunakan sabuk conveyor yang dipasangi sensor optis TCS230. Pengujian kecepatan conveyor optimum dilakukan dengan menggerakkan tomat yang diletakkan di atas conveyor mulai kecepatan 0 cm/s sampai 60 cm/s. Buah tomat cherry dengan tiga tingkat mutu selanjutnya diletakkan di atas conveyor dengan urutan secara acak pada jarak perlakuan antar tomat sebesar 3 cm, 5 cm, 7 cm dan dengan kecepatan conveyor optimum hasil pengujian tahapan sebelumnya. Hasil pengujian menunjukkan kecepatan pergerakan tomat optimum pada saat pendeteksian adalah 30 cm/s dengan jarak antar tomat sebesar 7 cm. Persentase keberhasilan perdeteksian mutu untuk tomat warna merah, oranye, dan hijau secara berurutan adalah 89%, 98%, dan 100%. Data pengujian tersebut menghasilkan kesimpulan bahwa sistem pendeteksi mutu yang dikembangkan sudah bekerja dengan baik walaupun ketelitian pedeteksian mutunya masih perlu ditingkatkan untuk tomat merah dan oranye.]]>
<![CDATA[Design of Cartesian Type Manipulator for Automatically Capturing Plant Images Inside Greenhouse ]]>
<![CDATA[I Dewa Made Subrata]]>;
<![CDATA[Jacklyn Melania]]>
<![CDATA[ Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 12, No 3 (2023): September 2023 ]]>
Publisher : <![CDATA[The University of Lampung ]]>
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DOI: 10.23960/jtep-l.v12i3.545-558
<![CDATA[Scientific activities often require large amounts of digital image data so it is required a device capable of capturing images automatically. This study aims to design a Cartesian-type manipulator with two translational movement for capturing and storing hydroponic plant images automatically and continuously. The manipulator is programmed to capture and store plant images from 15 different positions for seven consecutive days and two cycles a day, namely at 07.00 AM and 17.00 PM. The 2020 solid work simulation yields a maximum von Mises stress of 13,783 MPa, and a minimum safety factor of 6,869. The manipulator was tested using step period treatments of 0.002, 0.003, 0.004 seconds. The best test results is treatment of 0.002 seconds with an average of x-axis and y-axis positional error was 0.380 cm and 0.076 cm, the average translation speed was 8.96 cm/second. The positioning accuracy on the x-axis and y-axis is 98.9% and 99.8%. The movement stability is quite good around the set point with an error range on the x-axis and y-axis is -0.1 to +0.9 cm and -0.065 to 0.15 cm. System response less than 1 ms and energy consumption of 16,132 watt-hours/cycle. The manipulator is able to work according to the design objectives. Keywords: Automatic, Continuous, Cartesian manipulator, Digital image, Hydroponic plants]]>
<![CDATA[Analisa Pengaruh Posisi Biji pada Malai Terhadap Gaya Perontokan Beberapa Varietas Padi ]]>
<![CDATA[Ajat Zatmika]]>;
<![CDATA[Tineke Mandang]]>;
<![CDATA[Wawan Hermawan]]>;
<![CDATA[I Dewa Made Subrata]]>;
<![CDATA[Agus Sutejo]]>
<![CDATA[ Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 11 No 2 (2023): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem ]]>
Publisher : <![CDATA[Fakultas Teknologi Pangan & Agroindustri (Fatepa) Universitas Mataram dan Perhimpunan Teknik Pertanian (PERTETA) ]]>
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DOI: 10.29303/jrpb.v11i2.547
<![CDATA[Quantity and quality of rice grain can be developed through more efficient and accurate threshing methods based on the measurement of threshing force (TF). This study aimed to investigate the influence of rice varieties and grain position on the panicle on the threshing force (TF) results. Rice grains from several harvested varieties were dried to a moisture content level of 12% and prepared for threshing force (TF) testing. The research design used was a 2-factor completely randomized design with 3 replications. The first factor was rice varieties consisting of 4 levels: Sintanur, Siliwangi, Pajajaran, and Cakrabuana. The second factor was grain position on the panicle, consisting of 3 levels: upper, middle, and basal. Threshing force (TF) values were tested for 12 treatment combinations. The obtained data were analyzed using analysis of variance (ANOVA) followed by Duncan's multiple range test (DMRT) at a significance level of 5%. The results indicated that rice varieties had a highly significant effect on the threshing force (TF). On the other hand, grain position on the panicle had a non-significant effect on the threshing force (TF). The rice variety that produced the highest average threshing force (TF) value was Cakrabuana with 0.51 N, followed by Siliwangi with 0.50 N, Sintanur with 0.43 N, and Pajajaran with 0.35 N. The upper position of the grains on the rice panicle yielded the lowest average threshing force (TF) value of 0.41 N, compared to the middle position with 0.46 N and the basal position with 0.47 N.]]>
<![CDATA[Development of Microalgae Growth Monitoring System Using TSD-10 Sensor and ThingSpeak Platform ]]>
<![CDATA[I Dewa Made Subrata]]>;
<![CDATA[Mulki Azmi Novrizal]]>
<![CDATA[ Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 13, No 2 (2024): June 2024 ]]>
Publisher : <![CDATA[The University of Lampung ]]>
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DOI: 10.23960/jtep-l.v13i2.394-404
<![CDATA[Microalgae chlorella sp. is one of the low-level plants that has many benefits and need to be harvested when they have reached optimum density. This study aims to develop a microalgae density monitoring system using the TSD-10 sensor and the ThingSpeak platform. The output voltage from the TSD-10 sensor was calibrated into microalgae density using hemocytometer and then sent wirelessly to the ThingSpeak cloud server using the ESP8266 module. A linear equation of y = –1.633 x +1421.3 was obtained from the calibration process where y is microalgae density (cell/ml) and x is analog to digital conversion (ADC) value of the TSD-10 sensor. The determination coefficient of the calibration and validation process is 0.9921 and 0.938 respectively. The measurement stability was quite good with a standard deviation ranging from 1.15×104 cell/ml to 2×104 cells/ml of culture medium. The measurement accuracy of the validation process using the RMSE (Root Mean Square Error) formula is 3.25. The time response of the sensor after power on is 5.85 s and the time it takes to display data on the ThingSpeak cloud is 16.03 s. Thus the measuring instrument developed can be said to have a fairly good performance. Keywords: Density monitoring, Microalgae, ThingSpeak platform, Tsd-10 sensor.]]>
