ABSTRAK Telah dirancang sebuah sistem otomatisasi kontrol kadar pH dan informasi suhu. Kadar pH di ukur dengan menggunakan sensor pH E-201-C dan suhu di ukur dengan sensor DS18B20. Proses kontrol pH di lakukan dengan menambahkan cairan pH up dan pH down dan direalisasikan dengan katup solenoid. Tujuan pembuatan sistem ini adalah untuk mengontrol nilai pH air dalam akuarium dan memberi informasi tentang suhu air. Ke dalam sistem ini telah diinput nilai standar pH dan suhu pada masing-masing jenis ikan. Sistem ini akan bekerja secara otomatis untuk menyesuaikan lingkungan hidup ikan hias sesuai dengan kebutuhannya masing-masing. Sistem pengontrolan pH dapat bekerja apabila nilai pengukuran pH menyatakan kondisi pH tinggi atau pH rendah dan pada kondisi tersebut air akan mengalir ke tabung penyesuaian pH untuk melakukan kontrol. Apabila nilai pengukuran pH menyatakan bahwa pH tinggi maka cairan Kontrol pH down akan mengalir dan apabila nilai pengukuran pH menyatakan bahwa pH rendah maka cairan kontrol pH up akan mengalir. Sistem ini telah teruji mampu mempertahankan kondisi lingkungan hidup ikan hias dengan hasil pengukuran pH dan suhu adalah 7.48 -7.8 dan 28.87 – 29.55 0C. Kata kunci: Sensor pH E-201-C, Sensor DS18B20, pH down, pH up ABSTRACT An automated control system of pH value and temperature monitoring of an aquarium had been designed. For pH value measurement, E -201C type pH sensor had been used, while the temperature monitoring is done using DS18620 one wire temperature sensor. Controlling processing of pH is done by adding liquid of pH up and pH down and realized with solenoid valve. The aim is to control pH value of water in aquarium and giving information about temperature monitoring. This system had been inputted standard pH value and temperature to all variant of fishes. It works systematically to adapt on environment of the fishes by the needs. The system is able to work well if the controlling of pH value showed the condition up or down and water is able to flow to adapter tube. if the value shows that the pH is high then controlling liquid of pH up will be flowing while if pH is low then pH down will be flowing. This system had been tested to maintain the environment condition of fishes and showed by measuring of pH and temperature is 7.48 – 7.8 and 28.87– 29.55 0C. Keywords: Sensor pH E – 201, Sensr DS18B20, pH down, pH up.
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