Activity monitoring system in supine position for preventing unhealthy smartphone reading posture

The use of smartphones increasingly inseparable from human life. However, many users are using smartphones too often, so that they forget the time and consciously or unconsciously looked too close and too tilted to the screen of their smartphone. This bad habit that commonly done by smartphone users to correct the eye vision of what they were seeing on their smartphone's screen are highly unhealthy, particularly for their eyes and neck. Previously related research was created to help smartphone users preventing unhealthy reading postures while users in a standing or sitting position but most of the existing research do not researching the monitoring on lying down positions and its variation, especially on supine position. Which based on current research most users always tilt their heads 30° to 60° while reading on their smartphone screen with supine position, and its weight is about 4–6 times heavier than the normal head weight during normal posture. The validated result in this research show that by using accelerometer Z axis and captured image parameters only, it can be detected whether the user position is supine or not and the neck angle can be detected to inform users whether their posture are good or not while using smartphone.