A measurement mehtod of levelness based on SL4A direction sensor and its implementation

It is of great significance to reduce the development cost and difficulty of a levelness measurement system based on an Android Phone. In order to solve the difficulty of using Java language to develop a levelness measurement system, this paper proposes a method based on SL4A direction sensor and scripting languages to solve the problem. We first use sl4a to read data from an android phone direction sensor, and then use median filter to filter out noise of data, and finally work out inclination of the phone. The method is developed and tested by the PHP scripting language. The experimental results show that the method is simple, fast, reusable and scalable.