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Title: Frequency Counter Berbasis Mikrokontroler AT89S52
Authors: Afniza
Advisors: Drs. Syahrul Humaidi, M.Sc.
Issue Date: 4-Mar-2009
Abstract: Bilangan peroksida adalah indeks jumlah lemak atau minyak yang telah mengalami oksidasi. Untuk menentukan bilangan peroksida dari produk C1499 , dengan 30ml campuran aseton dan kloroform (3:2) yang akan dialirkan gas nitrogen selama 2 menit untuk menggantikan udara pada Erlenmeyer. Kemudian dimasukkan KI jenuh sebanyak 1 ml dengan pipet tetes, ditutup dan dikocok selama 1 menit. Dibiarkan selama 5 menit dalam ruangan gelap. Ditambahkan air destilat kira – kira 200 ml, kemudian dititrasi larutan tersebut dengan larutan 0,01 N Na2S2O3 menjadi larutan kuning pucat. Kemudian ditambahkan amilum sebagai indicator menjadi larutan warna hitam keungguan, dititrasi lagi dengan larutan 0,01 Na2S2O3 sampai menjadi larutan putih bening. Kemudian dihitung bilangan peroksidanya. Untuk produk C1499 bilangan peroksida di PT. SOCI Medan maksimal 1 mg.eq.
Abstract (other language): Frequency counter is an electronics instrument, or a component which is used for measuring frequency. With that definition of frequency counter I am as a writer got an idea to build a simple frequency counter by using ATMEL microcontroller’s product with the type is AT89S52. This frequency counter use one of the capability from AT89S52 microcontroller. AT89S52 can counts the pulse within the timer / counter pin of microcontroller. The principle of this frequency counter is described like this, first we activated the timer interrupt and switch the function as counter, as the external pulse interrupt this timer then the counter would be activated. The counting of external pulse is sampled for 1 second, after 1 second of sampling we can display the counts to LCD and display it as hertz. This frequency counter is designed for detect digital pulse with TTL level (0 Volt ~ 5 Volt). Because of that this frequency counter is limited for DC current with squarewave pulse and maximum amplitude is between 4,5 – 5 Volt.
Keywords: frequency counter
mikrokontroler at89s52
URI: http://repository.usu.ac.id/handle/123456789/14211
Appears in Collections:SP - Physics

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