Membuat GUI Matlab Sederhana Untuk Konversi Suhu Dengan Pop-Up Menu

GUI merupakan singkatan dari Grapichal User Interface. GUI merupakan salah satu fitur dalam matlab yang digunakan untuk menyajikan tampilan yang mudah untuk digunakan atau dibaca oleh pengguna (dalam istilahnya disebut juga aplikasi yang user friendly). Pada kesempatan kali ini, kami akan menampilkan contoh GUI sederhana untuk konversi suhu dengan menggunakan Pop-Up Menu. Pop-Up Menu adalah salah satu fitur dalam GUI yang digunakan untuk memilih plotting (ploting option) dalam bentuk daftar pilihan. Misalnya untuk konversi suhu yang kami buat, kita bisa memilih 3 konversi suhu yang kita inginkan yaitu Celcius (C) ke Reamur (R), Celcius (C) ke Fahrenheit (F), dan Celcius (C) ke Kelvin (K). Sebagaimana yang kita ketahui dalam fisika dasar kita mengenal rumus konversi suhu sebagai berikut.

1. Celcius (C) ke Reamur (R)

R = (4/5) C

R = suhu dalam skala Reamur
C = suhu dalam skala Celcius

2. Celcius ke Fahrenheit (F)

F = (9/5) C + 32

F = suhu dalam skala Fahrenheit
C = suhu dalam skala Celcius

3. Celcius (C) ke Kelvin (K)

K = C + 273

K = suhu dalam Kelvin
C = suhu dalam Celcius

Rumus-rumus tersebut akan kita gunakan pada Matlab untuk konversi suhu. Jika kita ingin meggunakan rumus tersebut pada Matlab maka kita harus menuliskannya dengan syntax yang benar (sesuai penulisan bahasa pemrograman matlab yang benar). Berikut tampilan aplikasi konversi suhu :


Pada Pop-Up Menu “Pilih Konversi”, kita bisa memilih 3 macam konversi seperti tampilan berikut :




Algoritma fungsi callback untuk Pop-Up Menu di atas sebagai berikut :



Kita simpan pilihan konversi dalam variabel mode ( mode 1, mode 2, mode 3) untuk nanti dipanggil pada fungsi callback start.

Kemudian masukkan suhu celcius seperti tampilan berikut ini :


Algoritma fungsi callback untuk input text di atas sebagai berikut :


mode = 1 hanya digunakan untuk inisial konversi saja (artinya tanpa memilih pilihan konversi maka otomatis suhu akan dikonversi dari Celcius ke Reamur). “Celcius” pada algoritma di atas adalah variable untuk menyimpan input text yang kita masukkan dalam bentuk string (kumpulan karakter).

Kemudian klik start untuk kalkulasi sekaligus instruksi untuk menampilkan hasil konversi seperti tampilan berikut :

part5 Algoritma fungsi callback untuk push buttom Start di atas sebagai berikut :



Dari program di atas kita, pertama program memanggil mode konversi ( mode =handles.mode) dan membaca input text yang kita tuliskan (Celcius = eval(get(handles.Celcius, ‘String’));). Setelah itu program akan mengkalkulasi data sesuai pilihan mode ( mode 1, mode 2, mode 3) dan menampilkannya pada hasil konversi (set(handles.hasil,’string’,hasil_konversi);). Kita bisa lihat tampilan hasil konversi 25 Derajat Celcius menjadi 20 Derajat Reamur sebagai berikut :


Algoritma fungsi callback untuk output text di atas sebagai berikut :


Yang kita butuhkan hanya nama variablenya saja yaitu “hasil” sebagai alamat tujuan untuk menampilkan data.

Setelah selesai mengkonversi suhu sesuai yang diinginkan, maka kita bisa meutup aplikasi ( close) dengan instruksi close seperti yang ada pada fungsi callback berikut :


Demikian tutorial GUI Matlab Sederhana untuk konversi suhu dengan menggunakan Pop-Up Menu. Apabila ada pertanyaan atau kurang paham, anda bisa menghubungi langsung ke contact person HWsmartsolution di nomor 081210889296 atau email, ataupun comment di bawah.


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