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All Journal Indonesian Journal of Electronics and Instrumentation Systems TELKOMNIKA (Telecommunication Computing Electronics and Control)
Tri Wahyu Supardi
Universitas Gadjah Mada
Computer Science & IT Electrical & Electronics Engineering

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The Digital Microscope and Its Image Processing Utility Sri Hartati; Agus Harjoko; Tri Wahyu Supardi
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 9, No 3: December 2011
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v9i3.749

Abstract

Many institutions, including high schools, own a large number of analog or ordinary microscopes. These microscopes are used to observe small objects. Unfortunately, object observations on the ordinary microscope require precision and visual acuity of the user. This paper discusses the development of a high-resolution digital microscope from an analog microscope, including the image processing utility, which allows the digital microscope users to capture, store and process the digital images of the object being observed. The proposed microscope is constructed from hardware components that can be easily found in Indonesia. The image processing software is capable of performing brightness adjustment, contrast enhancement, histogram equalization, scaling and cropping. The proposed digital microscope has a maximum magnification of 1600x, and image resolution can be varied from 320x240 pixels up to 2592x1944 pixels. The microscope was tested with various objects with a variety of magnification, and image processing was carried out on the image of the object. The results showed that the digital microscope and its image processing system were capable of enhancing the observed object and other operations in accordance with the user need. The digital microscope has eliminated the need for direct observation by human eye as with the traditional microscope.
PENGEMBANGAN SPEKTROFOTOMETER PORTABEL BERBASIS SENSOR OPT101 UNTUK PEMANTAUAN KADAR AMONIA PADA TAMBAK UDANG VANAME Raihan Zaenal Mutakin; Tri Wahyu Supardi
IJEIS (Indonesian Journal of Electronics and Instrumentation Systems) Vol 16, No 1 (2026): April
Publisher : IndoCEISS in colaboration with Universitas Gadjah Mada, Indonesia.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijeis.109198

Abstract

Kualitas air merupakan faktor penting dalam budidaya udang vaname, terutama terkait kandungan amonia terlarut yang berlebihan karena dapat menyebabkan stres dan menurunkan produktivitas. Metode spektrofotometri dikenal akurat untuk mengukur kadar amonia, namun alat konvensional berukuran besar dan tidak portabel, sehingga kurang efisien untuk pemantauan langsung di lapangan. Penelitian ini bertujuan mengembangkan spektrofotometer portabel berbasis sensor OPT101 untuk mendeteksi kadar amonia dalam air tambak secara langsung dan berkala.Sistem yang dikembangkan terdiri dari lampu halogen, monokromator berbasis kisi difraksi dan motor stepper, sensor OPT101, serta mikrokontroler ESP32 sebagai pengendali utama. Data pengukuran disaring menggunakan Kalman Filter. Pengujian dilakukan dengan larutan standar amonia 0,1–0,8 ppm untuk menentukan hubungan linier antara konsentrasi dan absorbansi, yang kemudian digunakan sebagai dasar estimasi konsentrasi amonia.Hasil pengujian menunjukkan nilai Mean Relative Error (MRE) sebesar 13% dan rata-rata akurasi 87%. Meskipun akurasi menurun pada konsentrasi di bawah 0,5 ppm, sistem tetap menunjukkan hasil pengukuran yang konsisten. Inovasi ini berpotensi menjadi solusi pemantauan kualitas air tambak yang real-time, efisien, dan terjangkau.
Co-Authors Agus Harjoko Raihan Zaenal Mutakin Sri Hartati