Augmented reality (AR) is a new form as integration of technologies that overlays computer-generated information on real world believed would help students in learning process. Hence, educators have begun to seek technologies that have the potential to be integrated in education in order to help students learn actively and improve their understanding. The focus of this research is on development of mobile application on logic gates topic with three inputs by using augmented reality technology for Computer Architecture and Organization Subject in University Pendidikan Sultan Idris (UPSI). Students have difficulty to understand logic gates besides less usage of mobile application on augmented reality in logic gates topic, this application could help them understand logic gates easily and effectively. By using ADDIE model, evaluation phase included pre-test and post-test have been carried out on target user as to see the improvement when using this mobile application. The result of finding show that the improvement percentage is 56%. Hence, this mobile Apps of AR technology could enhance the traditional forms of teaching and learning in order to improve student knowledge and interest about Logic Gates and also encourage students to think critically and creatively which improves their understanding and experiences using technology while learn.