Judul: Rancang Bangun Sistem Pengendalian Nirkabel Pada Pengemudian Traktor Mini
Abstrak: The research dealt with the development of wireless control tractor operation based on SPC Wireless Gamepad Interface module. Two operation were controlled, those were steering of tractor and operation of throttle. Steering was controlled using DC gear motor 38 Watt. Mechanism to rotate the steering wheel was using pulley and timing belt. Mechanism to control throttle was using linkage mechanism. Several sensors were attached to the tractor, those were obstacle detection sensors and turning angle sensors. Ultrasonic sensors for obstacle detection, measure the distance of obstacle in front of the tractor. The distance can be measured by ultrasonic sensors between 2 until 300 cms. This system was controlled by a microcontroller unit. When there was an obstacle in front of a tractor ≤150 cm, then buzzer will ringing. The ringing of buzzer indicate that the tractor within danger. To know turning angle of tractor used linear potentiometer through results recitation of ADC (Analog to Digital Converter). From the test result shown that ADC data was linear when tractor turn to the left or to the right. It was can be seen from equation Yleft=0.0282X+885.8 and Yright=-0.266X+885.8. Similarly, control throttle mechanism was also installed linear potentiometer to determine percentage of throttle, the test results showed that the linear equation Y=-0.838X +916.8. The maximum range of tractor controlling system with SPC Wireless Gamepad Interface module was 125 meters.
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Judul: Pengujian Kinerja Traktor Mini Dengan Kendali Nirkabel
Abstrak: In untrained situation, unmanned vehicles has been implemented with Artificial Intelligence as robots. The role of the human is still needed, because in many cases robots cannot take the proper decision. The purposes of this research was to test the performance of mini tractor controlled by a wireless device using SPC Wireless Gamepad Interface. Mini tractor used in this research was the Kubota B6100 with modification in steering control system. A remote controlled DC motor was connected to the steering wheel with pulley and belt transmission. An operator with the wireless controller controlled the direction of the tractor by controlling tractor's steering through DC motor. Factors that effected of the operation were operator's visibility, land topography and maximum range of the receiver. Turning radius of a normally operated mini tractor in clockwise direction in average was 2.24 meter and counter clockwise was 2.25 meter. In remote control method, the clockwise turning radius was 2.26 meter dan counter clockwise was 2.29 meter. Tillage test was also conducted using moldboard plow. The result showed that the Effective Field Capacity of a remotely controlled mini tractor was 0.030 ha/h, with 61.0% field efficiency. By using the conventional steering by a operator, the Effective Field Capacity was 0.025 ha/h with 57.7% field efficiency.
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Judul: Pengaruh kelembaban terhadap sifat optik lapisan gelatin
Abstrak: Gelatin yang merupakan material biologi dibuat dalam bentuk lapisan pada sebualı substrat gelas dengan telinik spincoating. Dalam penelitian ini dibuat 3 sampel film gelatin dengan variasi kecepatan dan waktu spinning dalam proses deposisi. Film gelatin pertama (AI) dideposisi selama 30 detik dengan kecepatan spinning 3740 rpm dan tebal rataan lapisan gelatin sampel Al adalah 0.144 mm. Film gelatin kedua (A2) dideposisi selama 25 detik dengan kecepatan 4200 rpm dan tebal rataan lapisan gelatin sampel A2 adalah 0.127 mm. Film gelatin ketiga (A3) dideposisi selama 30 detik dengan kecepatan 4300 rpm dan tebal rataan lapisan gelatin sampel A3 adalah 0.093 mm. Absorbansi optik film dipindai dari panjang gelombang 290-598 nm dalam rentang UV-Vis. Serapan optik tertinggi film gelatin berada pada panjang gelombang antara 298 nm dan 305 nm dalam rentang daerah ultraungu. Terlihat bahwa pola kurva indeks bias mengikuti pola kurva spektrum absorbansi. Indeks bias lapisan gelatin akan berubah-ubah untuk setiap panjang gelombang dalam rentang 290-598 nm. Hal ini menunjukkan hubungan linear antara indeks bias dengan absorbansi. Jika kelembaban udara (%RH) tinggi, maka akan menurunkan nilai indeks bias gelatin sehingga serapan optiknya berkurang.
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