Pengembangan Alat Portabel Pengukur Kadar Air dan Suhu Biji Kopi Berbasis ESP32 dengan Sensor Kapasitif dan Penyimpanan Data Real-Time

Ardianto Syaifur  Rohman; Mochamad Irwan Nari; Daniel Fernando  Siahan; Mursit Jamil; Atalarick Dwi Novial  Kurniawan; Sihmaulana  Dwianto; Tunjung Genarsih; Sepdian Luri Asmono

doi:10.5614/joki.2025.17.2.12

Authors

Ardianto Syaifur Rohman Program Studi Teknologi Rekayasa Mekatronika, Jurusan Teknik, Politeknik Negeri Jember, Jember, 68121, Indonesia
Mochamad Irwan Nari Program Studi Teknologi Rekayasa Mekatronika, Jurusan Teknik, Politeknik Negeri Jember, Jember, 68121, Indonesia
Daniel Fernando Siahan Program Studi Teknologi Rekayasa Mekatronika, Jurusan Teknik, Politeknik Negeri Jember, Jember, 68121, Indonesia
Mursit Jamil Program Studi Teknologi Rekayasa Mekatronika, Jurusan Teknik, Politeknik Negeri Jember, Jember, 68121, Indonesia
Atalarick Dwi Novial Kurniawan Program Studi Teknologi Rekayasa Mekatronika, Jurusan Teknik, Politeknik Negeri Jember, Jember, 68121, Indonesia
Sihmaulana Dwianto Program Studi Teknologi Rekayasa Mekatronika, Jurusan Teknik, Politeknik Negeri Jember, Jember, 68121, Indonesia
Tunjung Genarsih Program Studi Teknologi Rekayasa Mekatronika, Jurusan Teknik, Politeknik Negeri Jember, Jember, 68121, Indonesia
Sepdian Luri Asmono Program Studi Pengelolaan Perkebunan Kopi, Jurusan Pertanian, Politeknik Negeri Jember, Jember, 68121, Indonesia

Keywords:

coffee beans, moisture content, capacitive soil measurement v1.0

Abstract

The primary quality indicator of coffee beans is determined by their moisture content. This study aims to develop a portable prototype device for measuring both the moisture content and temperature of coffee beans, utilizing an ESP32 microcontroller integrated with a Capacitive Soil Moisture Sensor v1.0 and an SHT21 sensor. The device is designed to provide accurate and efficient measurements, with results displayed in real time on an OLED screen. In addition, the system stores measurement data on an SD card for further analysis. Experimental testing was conducted five times for each sample, comparing the results of the prototype with reference instruments, namely the YL-69 sensor for moisture measurement and a digital thermometer for temperature measurement. The results demonstrated that the device achieved a high level of accuracy, with an average relative error of 1.05% for moisture content and 0.91% for temperature. Furthermore, the prototype was proven to be portable and energy-efficient, consuming 7.7 Wh over 1.1 hours of operation, as evaluated through battery-based performance testing until full discharge. With its integrated data storage and real-time monitoring capabilities, this device provides a practical solution for coffee farmers and processors in maintaining and ensuring the quality of coffee beans.

References

International Coffe Organization, “Coffe Market Report,” Sep. 2020. Accessed: Jul. 09, 2025. [Online]. Available: https://dev.ico.org/news/cmr-1020-e.pdf.

D. Nur Aisyah and R. Indriawan, “Peluang Industri Pertanian Komoditas Kopi (Coffe) di Kecamatan Seponti Kabupaten Kayong Utara Desa Sungai Sepeti,” Lipida Jurnal Teknologi Pangan dan Agroindustri Perkebunan, vol. 4, no. 2, pp. 60–67, 2024, https://doi.org/10.58466/lipida.v4i2.1648.

M. Ikbal, M. C. Dewi, and K. Kharismawan, “Indikasi Geografis sebagai Nilai Tambah Produk Kopi Menuju Pasar Domestik dan Internasional,” Jatiswara, vol. 38, no. 1, pp. 85–94, 2023, https://doi.org/10.29303/jtsw.v38i1.449.

Suwali, A. Hendri Putranto, V. Bintang Panunggul, D. Putriana Nuramanah Kinding, and F. Novianti, “Analisis Kontribusi Ekspor Kopi Terhadap PDB Sektor Perkebunan di Indonesia,” PJEB: Perwira Journal of Economy & Business Analisis, vol. 2, no. 2, pp. 32–41, 2022. [Online]. Available: https://pdfs.semanticscholar.org/1451/10c8fc2c587f130ef12abc4becc2196780f3.pdf.

B. Soeswanto, N. Lintang Edi Wahyuni, and G. Prihandini, “The Development of Coffee Bean Drying Process Technology-A Review,” in Proceedings of the 2nd International Seminar of Science and Applied Technology (ISSAT 2021), Atlantis Press, 2021, https://doi.org/10.2991/aer.k.211106.026.

E. Firdissa, A. Mohammed, G. Berecha, and W. Garedew, “Coffee Drying and Processing Method Influence Quality of Arabica Coffee Varieties (Coffea arabica L.) at Gomma i and Limmu Kossa, Southwest Ethiopia,” J Food Qual, vol. 2022, 2022, https://doi.org/10.1155/2022/9184374.

Shodiq Eko Ariyanto, Heny Alpandari, Suharijanto, and Hendy Hendro Hadi Sridjono, “Pengaruh Suhu dan Lama Penyangraian Terhadap Sifat Fisik Kopi Robusta Tempur,” Jurnal Galung Tropika, vol. 13, no. 1, pp. 107–116, Apr. 2024, https://doi.org/10.31850/jgt.v13i1.1165.

S. Suro Mardjan, E. H. Purwanto, and G. Yoga Pratama, “Pengaruh Suhu Awal Dan Derajat Penyangraian Terhadap Sifat Fisikokimia Dan Citarasa Kopi Arabika Solok,” JTEP Jurnal Keteknikan Pertanian, vol. 10, no. 2, pp. 108–122, 2022, https://10.19028/jtep.10.2.108-122.

Badan Standardisasi Nasional, “Biji kopi,” 2008. Accessed: Jul. 09, 2025. [Online]. Available: https://www.cctcid.com/wp-content/uploads/2018/08/SNI_2907-2008_Biji_Kopi-1.pdf.

Barrera-López J, González-Barrios AF, Vélez LF, TTarquino LF, López H, and Hernandez-Carrión M, “Evaluation of roasting and storage conditions as a strategy to improve the sensory characteristics and shelf life of coffee,” Food Science and Technology International, vol. 30, no. 3, pp. 207–217, 2022, https://doi.org/10.1177/10820132221139890.

B. Girma and A. Sualeh, “A Review of Coffee Processing Methods and Their Influence on Aroma,” International Journal of Food Engineering and Technology, vol. 6, no. 1, p. 7, 2022, https://doi.org/10.11648/j.ijfet.20220601.12.

R. Priamudi and C. Bella, “Alat Uji Kadar Air pada Biji Kopi Berbasis Mikrokontroler Arduino UNO R3,” Jurnal Portal Data, 2022, http://portaldata.org/index.php/portaldata/article/view/76.

C. Viegas et al., “Microbial Contamination in the Coffee Industry: An Occupational Menace besides a Food Safety Concern?,” Int J Environ Res Public Health, vol. 19, no. 20, Oct. 2022, https://doi.org/10.3390/ijerph192013488.

R. A. Winarno, M. I. B. Peranginangin, and N. V. Sembiring, “Karakteristik Sifat Kimia Biji Kopi Arabika dengan Beberapa Metoda Pengolahan di Kabupaten Simalungun Provinsi Sumatera Utara,” Agrivet : Jurnal Ilmu-Ilmu Pertanian dan Peternakan (Journal of Agricultural Sciences and Veteriner), vol. 9, pp. 237–243, Dec. 2021, https://doi.org/10.31949/agrivet.v9i2.1701.

A. Nur rizky, A. Muarif, S. Bahri, N. Sylvia, E. Kurniawan, and W. U. Fibarzi, “Pengaruh Temperatur Roasting Biji Kopi Terhadap Kandungan Kafein Menggunakan Spektrofotometri UV-VIS,” Chemical Engineering Journal Storage (CEJS), vol. 3, no. 1, 2023, https://doi.org/10.29103/cejs.v3i1.9279.

Mutiara, A. Rustam, and N. Nurindah, “Cita rasa khas kopi Topidi melalui proses panen hingga metode pengolahan dry process dan full wash,” Filogeni: Jurnal Mahasiswa Biologi, vol. 3, no. 1, pp. 44–54, Apr. 2023, https://doi.org/10.24252/filogeni.v3i1.20678.

R. Damayanti, W. D. Ristianingrum, N. Ubaidillah, D. Firmanda, and A. Riza, “Prediction of Robusta green bean coffee moisture content based on bioelectric properties with artificial neural network method,” in Adv. in Food Science, Sustainable Agriculture and Agroindustrial Engineering, Malang: Faculty of Agricultural Tech., 2023. [Online]. Available: https://afssaae.ub.ac.idview/1910.

T. N. Sandeep, B. B. Channabasamma, T. N. Gopinandhan, and J. S. Nagaraja, “The effect of drying temperature on cup quality of coffee subjected to mechanical drying,” Journal of Plantation Crops, vol. 49, no. 1, pp. 35–41, May 2021, https://doi.org/10.25081/jpc.2021.v49.i1.7059.

E. M. Meja, S. K. Dubbe, A. Bekele, K. F. Wolde, and M. S. Adaramola, “Investigating the Performance and Optimization of Solar Coffee Drying Technologies—A Systematic Review,” J Food Process Preserv, vol. 2025, no. 1, Jan. 2025, https://doi.org/10.1155/jfpp/7907660.

S. Nuryati Afriani, I. Hadi, “Prototype Sistem Pengering Biji Kopi Otomatis Berbasis Web Server,” Prosiding SENIATI, vol. 5, pp. 214–218, 2019. [Online]. Available: https://ejournal.itn.ac.id/ 841/.

N. Nafisah, I. N. Syamsiana, W. Kusuma, R. I. Putri, and A. D. W. Sumari, “Analisa Perbandingan Pengaturan Suhu Berbasis Logika Fuzzy Interferensi Sugeno dan Mamdani pada Alat Pengering Biji Kopi,” Agroteknika, vol. 6, no. 2, pp. 272–288, Dec. 2023, https://doi.org/10.55043/agroteknika.v6i2.240.

I. Dhamayanthie, “Analisis Metode Pengurangan Kadar Air pada Biji Kopi,” Jurnal Pendidikan Tambusai, vol. 6, no. 2, 2022, https://doi.org/10.31004/jptam.v6i2.4366.

D. Rizkiana, A. Abidin, R. Mulaisari, and M. Ridlo, “Rancang Bangun Smart Eco Roasting Machine Kapasitas Maksimum 750 Gram dengan Sistem PErekaman Data Logger untuk Kontrol Kualitas Kopi,” Jambura Journal of Food Technology (JJFT), vol. 6, 2024, https://doi.org/10.32528/jp.v9i1.1040.

Nur Hasanah, Dayang Berliana, and Fitriani Fitriani, “Analisis Keuntungan dan Nilai Tambah Pengolahan Biji Kopi menjadi Kopi Bubuk di Kecamatan Way Tenong Kabupaten Lampung Barat,” Prosiding Seminar Nasional Pembangunan dan Pendidikan Vokasi Pertanian, vol. 3, no. 1, pp. 678–688, Sep. 2022, https://doi.org/10.47687/snppvp.v3i1.346.

F. Dina Rizkina, A. Abidin, R. Martha Muliasari, and M. Zainur Ridlo, “Rancang Bangun Smart Eco Roasting Machine Kapasitas Maksimum 750 Gram dengan Sistem Perekaman Data Logger untuk Kontrol Kualitas Kopi,” J-Proteksion: Jurnal Kajian Ilmiah dan Teknologi Teknik Mesin, vol. 9, no. 1, pp. 1–7, Aug. 2024, https://doi.org/10.32528/jp.v9i1.1040.

H. A. Setyabudhi and A. Wibowo, “Pengujian Kadar Air Benih Kopi dengan Empat Metode Persiapan Sampel Berbed,” 2021, [Online]. Available: https://www.researchgate.net/publication/396220062.

A. Muzakhim Imammuddin et al., “Pengaruh Roasting Kopi Dampit Terhadap Nilai Permeativitas Relatif Kopi Dampit,” Jurnal Jaringan Telekomunikasi, vol. 11, no.4, pp. 182–187, 2021, https://doi.org/10.33795/jartel.v11i4.252.

D. Adi Firmansyah et al., “Perancangan Purwarupa Pengukur Kadar Air dan Kualitas Pangan Komoditas Beras dan Jagung Menggunakan Sensor Kapasitif Design of a Moisture Content and Quality Meter Prototype for of Rice and Corn Food Commodities Using a Capacitive Sensor,” Jurnal Otomasi Kontrol dan Instrumentasi, vol. 16, no. 2, pp. 117–7, 2024, https://doi.org/10.5614/joki.2024.16.2.6.

M. A. Gümüser, A. Pichlhöfer, and A. Korjenic, “A Comparison of Capacitive Soil Moisture Sensors in Different Substrates for Use in Irrigation Systems,” Sensors, vol. 25, no. 5, p. 1461, Feb. 2025, https://doi.org/10.3390/s25051461.

Ulfa, S. Syahreza, Irhammi, M. S. Surbakti, and Fauzi, “Aplikasi Sensor SHT-11 Sebagai Alat Pendeteksi Kadar Air Pada Biji Kopi,” KITEKTRO: Jurnal Komputer, Informasi Teknologi, dan Elektro, vol. 6, no. 2, p. 16, 2021, https://doi.org/10.24815/kitektro.v6i2.21195.

A. N. Tompunu, T. Hafizhah, and M. T. Handayani, “The Moisture Content of Robusta Coffee Beans is dried in the Sun and the Room Temperature is measured with a Microcontroller-based Moisture Content Analyzer,” International Journal of Research in Vocational Studies (IJRVOCAS), vol. 4, no. 3, pp. 17–22, Dec. 2024, https://doi.org/10.53893/ijrvocas.v4i3.330.