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The process of manual fertilization and irrigation of plants has disadvantages such as it requires human labor and is inefficient in the use of fertilizers and water sources. Therefore, the purpose of this research is to design and develop an automatic fertigation system. The method used in this research is a drip fertigation technique where the fertigation liquid that has been stirred is placed in a tank with 100 cm height from ground. With the gravitational force, the fertigation liquid is distributed through pipes, hoses and emitters around the plant. While the control system and automation of fertigation distribution to plants is carried out based on a microcontroller that need the condition of soil moisture values around the plant. If the watering time and humidity values are met, the electronic valve will open so that the fertigation liquid flows from the tank to the plants. Furthermore, in this study the tests were carried out to determine the uniformity coefficient and debit of drip fertigation. From the results, it shows that the emitter’s debit influenced by the liquid level in the tank. The uniformity coefficient obtained in the two tests is greater than 90%. From the two tests carried out from the moisture sensor 1 and 2, it shows the mean percentage error for both sensor is less than 1.7%, while the percentage error of soil moisture sensor 1 is 1.6% and the percentage error of soil moisture sensor 2 is 1%, respectively. Meanwhile, from the ultrasonic sensor testing it was obtained 0% of error. It also shows from the testing conducted that the fertigation system works very well and successfully.

Paper ini menunjukan teknologi pengukuran ketinggian BBM dalam tangki minyak secara otomatis kemudian menginformasikan keadaan ketinggian BBM tertentu ke telepon seluler pemiliknya melalui pesan singkat (SMS). Penerapan teknologi ini dilakukan pada miniatur tangki minyak berukuran mini berdiameter 26 cm. Ketinggian BBM dalam tangki minyak diukur menggunakan sensor jarak Ultrasonic PING. Sinyal dari sensor PING diumpankan ke modul mikrokontroler Arduino Uno untuk dilakukan pengaturan dan pemprosesan data. Selanjutnya informasi hasil pengolahan data ditampilkan di layar LCD.  Pada ketinggian BBM tertentu yang menjadi perhatian khusus, informasi dikirim ke pemiliknya dengan teknologi informasi berupa pesan singkat (SMS). Teknologi informasi dibangun dengan menggunakan modul GSM yang terhubung dengan Arduino Uno. Selanjutnya informasi dari modul GSM dikirim melalui jaringan GSM ke telepon seluler pemilik. Hasil pengujian dari pengukuran ketinggian BBM dalam miniatur tangki minyak hingga 25 cm memiliki akurasi 100%. Akurasi pengukuran ini berkurang pada ketinggian BBM di atas 25 cm. Secara keseluruhan pengukuan ketinggian BBM dalam tangki minyak ini memliki akurasi sebesar 97,9%. Teknologi informasi dan pengukuran otomatis yang dirancang mampu bekerja dengan baik.