How to distinguish MEMS accelerometer and MEMS gyroscope?
[introduction] the biggest distinguish even if: The distinction of working principle and application (specific concept sees below 100 families) , former it is to use acceleration, latter is to use inertial; Former it is to be used in measure slop regulation to make the same score, latter is to know to pass know horny rate, can know the attitude of the object, so that have attitude control. Two kinds of things are to be united in wedlock to apply together normally.
MEMS accelerometer and MEMS gyroscope are distinguished
The biggest distinguish even if: The distinction of working principle and application (specific concept sees below 100 families) , former it is to use acceleration, latter is to use inertial; Former it is to be used in measure slop regulation to make the same score, latter is to know to pass know horny rate, can know the attitude of the object, so that have attitude control. Two kinds of things are to be united in wedlock to apply together normally.
For instance IMU (inertial measure unit) : With 3 axes accelerometer is combined and become by 3 axes gyroscope namely.
The reason since knot syncretic is: Accelerometer is multi-purpose in the static state or divide evenly is slow in fast motion, and gyroscope should multi-purpose in trends, and inertial parts of an apparatus as time lengthen, can 0 float. So accelerometer can give out certain correction.
Now to satisfy all sorts of need, have assorted navigation, namely satellitic navigation and be used to guide combination (GNSS/INS) .
Accelerometer is the athletic acceleration that measures carrier, gyroscope is the speed of corner coming back that measures carrier.
Disclose the distinction that is gyroscope and accelerometer. One calculates horny rate through pitching moment, measure point of view through horny rate integral, hold the stance part of machine general; Latter line acceleration, pass integral to be able to calculate speed and displacement commonly.
What does chip of sensor of common MEMS acceleration have?
MMA7260, fly to those who think of Carl, sensitivity 6g (200mV/g) , 4g (300mV/g) , 2g (600mV/g) , 1.5g (800mV/g) adjustable, the most commonly used 3 axes accelerometer. Noise is very horrible, careful with. 20RMB is controlled.
ADXL335, of AD, sensitivity 3g (300mV/g) , but noise is very little, the word noise of 12 sampling also solicit comments loses 1LSB. Also be 20RMB controls.
Above I had used two accelerometer. The individual thinks best can choose noise small, sensitivity is small can magnify, noise can manage with respect to bad part. OK also of course RC is low the wave that connect filter, but noise is complete frequency white noise, RC filter wave is low if understanding the word with too low frequency, can reduce answer speed.
Still have MMA7455, ADXL345 additionally, can saying almost is above number of two I2C, SPI exports version, had not used; Still have ADXL203, noise is very little sensitivity is very tall, but be double axis, 90+RMB.
Need above the word of the DATASHEET of a few chip, with English edition Google search model is taken the first times commonly [PDF] the search of model of written characters is corresponding DATASHEET as a result.