manual calibration method that can be used to correct for constant magnetic offsets in
your system (due to nearby metallic components, etc.). This calibration method
requires the device to be repositioned between multiple steps of the calibration
process.
See the compass_calibration application for an example of using a three-step manual
calibration sequence. This application requires the user to alternately move the board
to a specific position (laying flat, turned 180°, or inverted) and press a button on the
processor board. After three such measurements, the three axes of the compass can
be corrected.
9.4.4 Self test
The HMC5883L device provides a basic self test, which applies a known bias to the
sensor device and confirms that the resulting sensor readings are within an expected
range. Use the sensor_selftest() function with the SENSOR_TEST_DEFAULT
type code. If the sensor is operating correctly, the function will return true . If the test
fails, the function will return false .
9.4.5 Events
The HMC5883L device can generate the following event:
? SENSOR_EVENT_NEW_DATA
9.5 Invensense IMU-3000 gyroscope/motion processor
9.5.1 Range
The IMU-3000 device provides the following range settings, expressed in ± degrees
per second (°/s):
? 250
? 500
? 1000
? 2000
The default setting is ±2000°/s.
9.5.2 Sampling frequency/bandwidth
The IMU-3000 device provides the following sampling frequency settings, expressed
in hert (Hz):
? 5
? 10
? 20
? 42
? 98
? 188
? 256
? 2100
The default setting is 256Hz.
30
Atmel AVR4016
8367B-AVR-06/11
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