Rancang Bangun Alat Ukur Kadar Air Agregat Halus Berbasis Mikrokontroler ATmega8535 dengan Metode Kapasitif untuk Pengujian Material Dasar Beton
DOI:
https://doi.org/10.25077/jfu.5.1.14-20.2016Abstract
Telah dilakukan rancang-bangun alat ukur kadar air agregat halus dengan sensor kapasitif dan mikrokontroler ATmega8535. Sensor kapasitif dibuat dari kotak akrilik berukuran 10 cm x 5 cm x 10 cm yang pada kedua sisi dalamnya dipasang dua buah plat tembaga yang terhubung ke rangkaian multivibrator. Perubahan kapasitansi akibat perubahan kadar air diubah menjadi nilai frekuensi dan ditampilkan pada LCD. Perubahan frekuensi kemudian dideteksi dan digunakan untuk mengetahui kadar air agregat. Berdasarkan hasil pengujian diperoleh bahwa alat yang dibuat dapat mengukur kadar air agregat dari 1% sampai 3% dengan rata-rata kesalahan sebesar 4,82%. Alat yang dibuat juga dilengkapi dengan alarm yang akan berbunyi jika kadar air agregat melebihi 3%.
Kata kunci: kadar air, mikrokontroler, sensor kapasitif.
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Copyright (c) 2016 Annisa Yuniasti, Wildian Wildian, Rahmat Rasyid
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