The biggest difference is: the difference between working principle and application (see Encyclopedia for specific concepts). The former uses acceleration, while the latter uses inertia; the former is used for tilt measurement and leveling, and the latter is known by knowing the angular rate. The posture of the object for posture control. Two things are usually combined and applied together.
For example, IMU (Inertial Measurement Unit): It is a combination of a three-axis gyroscope and a three-axis accelerometer.
The reason for the combination is that accelerometers are mostly used in static or uniform slow motion, while gyroscopes should be used mostly in dynamics, and inertial devices will have zero drift over time. So the accelerometer will give a certain correction.
Now in order to meet various needs, there is integrated navigation, that is, the combination of satellite navigation and inertial navigation (GNSS/INS).
The accelerometer measures the acceleration of the carrier, and the gyroscope measures the angular velocity of the carrier's rotation.
To put it bluntly is the difference between a gyroscope and an accelerometer. One calculates the angular rate by torque, and measures the angle by angular rate integration, the attitude angle of the carrier is normal; the latter measures the line acceleration, generally the speed and displacement can be calculated by integration.
What are the common MEMS acceleration sensor chips?MMA7260, Freescale's, sensitivity 6g (200mV/g), 4g (300mV/g), 2g (600mV/g), 1.5g (800mV/g) adjustable, the most commonly used 3-axis accelerometer. The noise is terrifying, use it with caution. Around 20RMB
ADXL335, AD, the sensitivity is 3g (300mV/g), but the noise is very small, and the noise is plus or minus 1LSB for 12-bit sampling. It is also about 20RMB
I have used both of the above accelerometers. I personally think that it is best to use low noise, low sensitivity can be amplified, but high noise can be difficult to handle. Of course, RC low-pass filtering is also possible, but the noise is full-frequency white noise. If the low-pass frequency of RC filtering is too low, the response speed will be reduced.
There are also MMA7455 and ADXL345, which can be said to be the I2C and SPI digital output versions of the above two, which have not been used; there is also ADXL203, which has very low noise and high sensitivity, but it is dual-axis, 90+RMB each.
If you need DATASHEET of the above chips, use the English version of google to search for the model. Generally, the first search result with [PDF] is the corresponding DATASHEET.
The latest Windows has multiple versions, including Basic, Home, and Ultimate. Windows has developed from a simple GUI to a typical operating system with its own file format and drivers, and has actually become the most user-friendly operating system. Windows has added the Multiple Desktops feature. This function allows users to use multiple desktop environments under the same operating system, that is, users can switch between different desktop environments according to their needs. It can be said that on the tablet platform, the Windows operating system has a good foundation.
Windows Tablet,New Windows Tablet,Tablet Windows
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