Electronic Theses and Dissertation

Penelitian ini dilandasi oleh pentingnya peranan intensitas cahaya dan kelembaban tanah untuk petumbuhan tanaman. Tujuan dari penelitian ini adalah untuk membuat alat yang dapat mengukur intensitas cahaya dan kelembaban tanah pada tanaman yang mendekati alat standar buatan pabrik. Alat ukur dirancang menggunakan modul sensor cahaya light dependent resistor, modul sensor kelembaban SKU SEN0193, pemroses data mikrokontroler ESP32, dan penampil hasil LCD I2C 16x4. Tahapan penelitian terdiri dari pengkalibrasian alat dan pengujian alat hasil rancangan dengan alat standar pabrik. Kalibrasi pengukuran intensitas cahaya dilakukan dengan menvariasikan jarak sumber cahaya terhadap alat hasil rancangan dan luxmeter Lutron lx-102. Kalibrasi pengukuran kelembaban tanah dilakukan dengan menvariasikan jumlah air dalam tanah, kemudian diukur dengan metode analitik, alat rancangan, dan soil survey instrument 4in1. Hasil pengujian alat ukur intensitas cahaya hasil rancangan yang dibandingkan dengan alat lux meter lutron lx-102 menunjukkan nilai error 1% dan keakuratan 99%. Hasil pengujian alat ukur kelembaban tanah yang dibandingkan dengan metode analitik memperlihatkan nilai error 1% dan keakuratan 99%, dan dibandingkan dengan alat ukur soil survey instrument 4 in 1 memiliki hasil yang sama. Berdasarkan hasil pengujian, alat ukur yang dirancang dapat berfungsi dengan baik mengukur kelembaban tanah dan mengukur intensitas cahaya dalam ruangan.
Kata Kunci: intensitas cahaya, kelembaban tanah, sensor LDR, sensor capacitive soil moisture, mikrokontroler ESP32

This research is based on the important role of light intensity and soil moisture for plant growth. The aim of this research is to design and develop an instrument that can measure light intensity and soil moisture that is close to standard instruments. The measuring instrument was designed using a light-dependent resistor (LDR) sensor module, the SKU SEN0193 humidity sensor module, an ESP32 microcontroller data processor, and a 16x4 I2C LCD display. The research stages consist of instrument calibration and testing the designed instrument with standard instruments. Calibration of light intensity measurements was carried out by varying the distance of the light source to the designed instrument and the Lutron lx-102 luxmeter. Calibration of soil moisture measurements was carried out by varying the amount of water in the soil, which was then measured using the analytical methods, the designed instrument, and the 4in1 soil survey instrument. The test results of the designed light intensity measuring instrument compared with the Lutron lx-102 lux meter show an error value of 1% and an accuracy of 99%. The test results of the soil moisture measuring instrument compared with the analytical method show an error value of 1% and an accuracy of 99%, and compared with the 4 in 1 soil survey instrument, the results are the same. Based on the test results, the designed measuring instrument can function well in measuring soil moisture and indoor light intensity. Keywords: light intensity, soil moisture, LDR sensor, capacitive soil moisture sensor, ESP32 microcontroller