accelerometer in mobiles

Android OS 11 sensor introductionIn the Android2.3 gingerbread system, Google offers 11 types of sensor supply layer usage.#defineSensor_type_accelerometer 1//Acceleration#defineSensor_type_magnetic_field 2//Magnetic#defineSensor_type_orientation 3//direction#defineSensor_type_gyroscope 4//Gyroscope#defineSensor_type_light 5//Light Sensing#defineSensor_type_pressure 6//pressure#defineSensor_type_temperature 7//Temperature#defineSensor_type_proximity 8//Close#defineSensor_type_gravity 9//Gravity#

Db. getCollection (mobiles ). ensureIndex ({params. name: 1, params. value: 1}); db. getCollection (mobiles ). insert ({_ id: 1, name: ME525, brand: Motorola, params: [{name: standby time, value: 200}, {name: design, va Db. getCollection ("mobiles "). ensureIndex ({"params. name ": 1," params. value ": 1}); db. getCollection ("

The following is a design example to compare the two: assume that we are maintaining a mobile phone product library, which includes not only the phone name, brand, and other basic information, but also the standby time, how do I access data for parameter information such as design?How can I access data using MySQL?If MySQL is used, the basic information of the mobile phone is a separate table. In addition, because the parameter information of different mobile phones varies greatly, a parameter t

iOS Gyroscope parameter significance Self.mmanager = [[Cmmotionmanager alloc]init]; Self.mManager.deviceMotionUpdateInterval = 0.5; if (self.mManager.gyroAvailable) { [Self.mmanager startdevicemotionupdatestoqueue:[nsoperationqueue Currentqueue] withhandler:^ (cmdevicemotion * _nullable motion, Nserror * _nullable error) { NSLog (@ "Rotationrate X:% .2LF y:%.2lf Z:%.2lf ", motion.useracceleration.x,motion.useracceleration.y,motion.useracceleration.z); }]; }

Source: Basic working principle of magnetometerThis article is so good that I can't help but turn around.This article explains in detail the basic working principle of magnetometer, the cause of interference and how to calibrate, how to use the magnetometer and inclination sensor.Original address: http://www.dzsc.com/data/html/2010-11-29/87454.html The electronic compass is an important navigation tool which can provide the moving object's heading and posture in real time. With the progress of s

MySQL is a star in relational databases, and MongoDB is a leader in document-based databases. MySQL is a star in relational databases, and MongoDB is a leader in document-based databases. The following is a design example to compare the two: assume that we are maintaining a mobile phone product library, which includes not only the phone name, brand, and other basic information, but also the standby time, how do I access data for parameter information such as design? How can I access data using

The following is a design example to compare the two: Suppose we are maintaining a cell phone product library, in addition to include the name of the phone, brand and other basic information, but also includes standby time, design parameters such as information, how should access to data? If you use MySQL, how do you access the data? If you use MySQL, the basic information of the mobile phone is a single table, in addition, because of the different parameters of the mobile phone information vary

acceleration sensor data will be changed, the answer is yes, the mobile phone acceleration sensor data will have a brief but significant changes, why, the mobile phone force balance acceleration of 0 because it is a whole, But the internal components will be affected by the complex force between the left and right, not the force at the same time to achieve the force balance, in fact, change the train of thought. With a similar interior smooth container, the container contains a few glass balls,

of the four-rotor aircraft, and the position control is based on the perfect attitude control. As already mentioned, it is unreliable to obtain the angle value only by gyroscope integral, because of the inherent drift of the gyroscope, the error caused by the integral becomes more and more large, and the accelerometer is susceptible to noise and vibration disturbance. Therefore, the two kinds of data are fused using various algorithms to obtain the i

**1354 Mobile Computing**There is a mysterious planet called Yaen, whose space is 2-dimensional. There is many beautiful stones on the planet, and the Yaen people love to collect them. They bring the stones back home and make friendly mobile arts of them to decorate their 2-dimensional living rooms.In their 2-dimensional world, a mobile is defined recursively as follows:a stone hung by a string, ora rod of length 1 with a sub-mobiles at both ends; The

various SMART services. The following table is a summative table that includes representative sensors except for light intensity sensors that are too simple. Now let's introduce them one by one. Accelerometer Electronic Compass Gyroscope Proximity sensor Function The human body motion is determined by measuring the acceleration of the three axes. Determine orientation by measuring the intensity and direction of th