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All Journal KATALIS: Jurnal Penelitian Kimia dan Pendidikan Kimia Jurnal Penelitian Rumpun Ilmu Teknik
Achmad Dzaki
Politeknik Negeri Jakarta
Chemistry Computer Science & IT Education Engineering

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PEMBUATAN KERTAS INDIKATOR ALAMI DARI BUNGA TELANG (CLITORIA TERNATEA), KUNYIT (CURCUMA LONGA), DAN JANTUNG PISANG (MUSA ACUMINATA) Sahiba Sahila; Khalda Khairunnisa Mulyana; Tsalis Muthia Kamila; Mitzy Balqist Dhabitah; Nahya Alya; Achmad Dzaki; Anisa Nuraini
KATALIS: Jurnal Penelitian Kimia dan Pendidikan Kimia Vol 9 No 2 (2026): Jurnal Katalis Volume 9 Nomor 2 Tahun 2026
Publisher : Universitas Samudra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33059/katalis.v9i2.14606

Abstract

The use of synthetic indicators, which may cause chemical pollution and are relatively expensive, has encouraged the development of natural indicators that are more environmentally friendly, economical, and easily accessible. This study aimed to investigate the potential of butterfly pea flower (Clitoria ternatea), turmeric (Curcuma longa), and banana bract (Musa acuminata) extracts as materials for natural indicator paper within a pH range of 1–14. The research was conducted by extracting each material using 96% ethanol with a ratio of 1:4 for 24 hours. The resulting filtrates were diluted with distilled water and used to soak filter paper for 30 minutes to produce natural indicator papers. The indicator papers were then tested in solutions with pH values ranging from 1 to 14 to evaluate their color changes, sensitivity, and working range. The results showed that butterfly pea flower exhibited the best performance with distinct color changes from red in acidic conditions, purple near neutral pH, to green and yellow in strongly alkaline conditions. Turmeric demonstrated significant color changes mainly in alkaline conditions, changing from yellow to orange and reddish-brown, making it more suitable as an indicator for alkaline solutions. Meanwhile, banana bract showed color changes with lower intensity and less contrast compared to butterfly pea flower and turmeric. Based on the findings, butterfly pea flower has strong potential as a versatile natural indicator with a wide pH range, while turmeric is more effective for detecting alkaline solutions.
Rancang Bangun Pencetak Kertas Stiker Nirkabel Berbasis ESP32 untuk Pencetakan Kode QR Yoga Putra Pratama; Rachmah Nanda kartika; Achmad Dzaki; Agam Maulana Putra; Khalda Khairunnisa Mulyana; Fatimah Nurina Adlina; Misykah Nur Fithriyah; Emmidia Djonaedi
Jurnal Penelitian Rumpun Ilmu Teknik Vol. 5 No. 3 (2026): Jurnal Penelitian Rumpun Ilmu Teknik
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/juprit.v5i3.6849

Abstract

The rapid adoption of digital transactions and contactless services has driven the demand for compact, flexible printing systems, particularly for Quick Response (QR) codes. This study designs and evaluates an ESP32-based wireless sticker paper printer tailored for real-time QR code generation and printing. Using a Research and Development (R&D) approach based on the Borg and Gall model, the prototype integrates an ESP32 microcontroller, a 58 mm Bluetooth thermal printer, an I2C 16x2 LCD display, and push-button inputs. System performance was analyzed based on software-hardware integration and Bluetooth Response Time (BRT) across varying distances. The results demonstrate that the system operates reliably within a 2 to 8-meter range, maintaining a stable response time of 95–96 ms. At 10 meters, response time increases significantly to 2,908 ms due to packet loss, while distances exceeding 10 meters lead to disconnection ("BT Failed"). This standalone system offers a responsive, cost-effective wireless printing solution for QR code labeling in micro, small, and medium enterprises.
Co-Authors Agam Maulana Putra Anisa Nuraini Emmidia Djonaedi Fatimah Nurina Adlina Khalda Khairunnisa Mulyana Khalda Khairunnisa Mulyana Misykah Nur Fithriyah Mitzy Balqist Dhabitah Nahya Alya Rachmah Nanda Kartika Sahiba Sahila Tsalis Muthia Kamila Yoga Putra Pratama