Volume 10, Issue 1, April 2023, pp. 142-151 ISSN 2355-5068 ; e-ISSN 2622-4852 DOI: 10.33019/jurnalecotipe.v10i1.3894 142 Homepage : https://journal.ubb.ac.id/ecotipe Email : jurnalecotipe@ubb.ac.id Design and Build a Website-Based Landslide Early Warning System Muhammad Ghofinda Prasetia 1 , Puji Cahniya Sari 2 , M. Azwan 3 , Inayatul Inayah 4 , Fajar Mahardika 5 ARTICLE INFO ABSTRACT Article history: Received : 28/02/2023 Revised : 07/04/2023 Accepted : 30/04/2023 An early warning system is very important to implement to minimize losses received when a disaster occurs, one of which is a landslide disaster. An early warning system for landslides is carried out so that people can find out the signs of a disaster that can be accessed anywhere, so they can prepare themselves. For this reason, a tool is needed that can detect and provide early warning of landslides to the public which can be accessed through the website. In this study, a website-based landslide early warning system has been designed using a soil moisture sensor to measure it and the MPU6050 sensor to measure the slope of the soil. Sensor data will be displayed on the LCD and sent to the database and can be monitored through the website. The avalanche detector made is powered by a 15 V DC battery to provide 5V output to the NodeMCU ESP8266. Soil moisture sensor, MPU6050, LCD I2C, LED, and relay work at 5V. A Relay is used to turn on the siren at 12V voltage. Based on our research, the soil moisture measurement value between the sensor and the comparison device is around 1.55% and the soil slope measurement value between the sensor and measuring tool is around 0.14%, these two factors influence each other. The measurement error is still fairly normal according to the soil moisture sensor datasheet and MPU6050, which are ±3% together. Keywords: Landslide; Landslide Detector; MPU6050; Soil Moisture; Website Copyright © 2023. Published by Bangka Belitung University All rights reserved Corresponding Author: Muhammad Ghofinda Prasetia Jl. Karangdowo No.9 Kedungwuni Kab. Pekalongan, 51173, Indonesia. Email: prasetia1805@gmail.com 1. INTRODUCTION Landslides are a disaster that often occurs in hilly and mountainous areas [1]. The condition of the soil in parts of Indonesia is classified as prone to landslides. Based on the landslide vulnerability zone map according to the National Disaster Management Agency (BNPB) in 2023, there were 634 landslides in Indonesia [2]. Geographical conditions, which are generally mountainous areas with slopes, make the soil unstable. As a result, when the soil is moved, it becomes prone to landslides [3, 4]. Movement of soil and excess water content are the main causes of landslides. Landslides are also affected by the presence of a driving force on the ground which is greater than the resisting force [5, 6, 7]. In general, the Center for Volcanology and Geological Hazard Mitigation said that landslides have several symptoms that can be observed visually, including occurring after rain, cracks appearing on the slopes parallel to the direction of the cliff, buildings starting to crack, trees or electricity poles slanted, and 1,2,3,4 Physics Study Program, Faculty of Science and Technology, Pekalongan Nahdlatul Ulama Institute of Technology and Science 5 Computer Technology Study Program, Faculty of Science and Technology, Pekalongan Nahdlatul Ulama Institute of Technology and Science Jl. Karangdowo No.9 Kedungwuni Kab. Pekalongan, 51173, Indonesia.