Indonesian Journal of Electrical Engineering and Computer Science Vol. 31, No. 3, September 2023, pp. 1342~13491 ISSN: 2502-4752, DOI: 10.11591/ijeecs.v31.i3.pp1342-1349  1342 Journal homepage: http://ijeecs.iaescore.com Development of dam controller technology water level and alert system using Arduino UNO Mazratul Firdaus Mohd Zin, Farid Zuhri Kamal, Syila Izawana Ismail, Ku Siti Syahidah Ku Mohd Noh, Abdul Hafiz Kassim School of Electrical Engineering, College of Engineering, Universiti Teknologi MARA, Terengganu, Malaysia Article Info ABSTRACT Article history: Received Mar 16, 2023 Revised May 2, 2023 Accepted May 6, 2023 Recently, various water level detection monitoring systems integrations were implemented to various places such as rivers and reservoirs to avoid floods. Thus, it is determined to construct a project primarily focused on water level management, named dam controller technology (DCOTech). DCOTech is a system that controls the amount of water in a reservoir using a microcontroller ATMEGA328p and several functions to prevent flash floods. Water sustainability requires proper monitoring via sensors and a controller. Moreover, a buzzer is used in DCOTech to give a warning signal to the people around and the residents. The water level sensor was constructed with a metal plate attached at both the bottom and top edges of the reservoir. The results obtained met expectations; whenever the sensor detects the water level is low, the green light emitting diode (LED) is turned on; otherwise, when the sensor detects the water level is high, the drain valve is opened, and simultaneously, turned on the buzzer to alert the surrounding. The goal of this project is to integrate a control system into an autonomous water level controller. This study aims to provide a solution to unexpected floods and to notify inhabitants when the water level is dangerously high. Keywords: Arduino UNO ATmega328P Automatic valve Water level control Water level sensor This is an open access article under the CC BY-SA license. Corresponding Author: Mazratul Firdaus Mohd Zin School of Electrical Engineering, College of Engineering, Universiti Teknologi MARA Terengganu, Malaysia Email: mazratul204@uitm.edu.my 1. INTRODUCTION Every year, Malaysia will be hit by a series of floods that caused widespread damage and displacement. The floods were caused by a combination of heavy rainfall and high tides, and they affected nearly half of the country. More than 300,000 people were forced to evacuate their homes, and over 2,000 homes were destroyed. The floods also caused significant damage to infrastructure, including roads, bridges, and railways. The floods were a major blow to the Malaysian economy, and they had significant humanitarian consequences. They posed a threat to the health of millions of people who were forced to flee their homes, and they led to the displacement of thousands of people who were unable to find new accommodations [1]–[5]. The floods also disrupted the lives of many families, and they caused tremendous stress for those affected. Overall, the floods were a major disaster that caused widespread damage and loss of life. Recently, water level monitoring systems have become a niche area in research studies. It is a crucial area that needed to be investigated since floods occurrence in residential areas kept happening and there was lack of effective methods to prevent massive loss of residents belonging. A solution is needed by providing a system to warn the residents of the incoming flood. Much research has been carried out previously related to water level monitoring systems involving Arduino UNO and ultrasonic sensor [6]–[13]. The focus of the