ABSTRACT Bungque, Christian C., Villaronte, Sam P., Yumul, Aldrey H., Department of Computer Studies and Automation, College of Engineering and Computer Studies, Pampanga State Agricultural University, Magalang. Pampanga. June 2023. "SOLARED ULTRASONIC INSECT REPELLER USING ANDROID APPLICATION". Adviser: Ms. Gemmarie Tapnio For decades, endemic and epidemic vector-borne diseases have plagued the Philippines and the worid. However, the prolonged usage of pesticides has become toxic to humans, prompting scientists to take an alternate route such as ultrasonic repellant. Building up on the concept that ultrasonic sound waves disturb vectors auditory senses, which drive them away, the researchers developed a sustainable solar energy-powered ultrasonic pest repellant that emits high- frequency sound, which can be controlled remotely via mobile application. In an attempt to prove its concept, the researchers designed the solar- powered ultrasonic pest repellant system with the following objectives: to detect insect and pest whenever pests are within the vicinity, an alarm or notification whenever the battery discharge is low, a way to configure the volume and frequency of the buzzer, to create a user interface and lastly, to have the software and hardware evaluated by experts. By following the Rapid Application Development framework with its cyclical prototyping-testing-refining methodology, the researchers were able to meet the study's objectives. Post-development, the device was consigned to residents of San Nicolas, Mexico, Pampanga for evaluation and testing. The respondents, along with the three (3) IT experts and three (3) hardware experts were asked to assess its functionality using a 4-point Likert Scale. Following the interpretation of data, results showed that the three sets of evaluators of the overall system was effective in repelling and detecting insects and rodents. The device garnered an average of 3.40 rating from the hardware experts, 3.84 from the IT experts, and 3.66 from the respondents. Despite its portability issues, all three groups still concurred that the mobile application's user interface was easy to learn and operate. Moreover, the system's renewable power source was enough for the entire development phase and data gathering.