Augmented reality (AR) enhances the user view of the environment by overlaying the virtual information on the physical world, thereby creating an illusion to the user. For creating a good illusion, we need to accurately register the virtual world on top of real world. In fact, many applications such as AR-based classroom education demand accurate registration where the virtual objects in the course content and real objects should properly align with respect to each other. For accurate registration, the system needs to estimate the camera pose. To this end, in this work we develop a camera pose estimator using LEDs as markers towards immersive AR experiences in classroom education.