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This compass module has cmps03 specifically cmps03 for use in robots as an aid to navigation. The aim was to produce a unique number to represent arduino direction the robot is facing. The compass uses the Philips KMZ51 magnetic field sensor, which is sensitive enough to detect the Earths magnetic field.
The output from two of them cmps03 at right angles to each other is used arduino compute the direction of the horizontal component arduino the Earths magnetic field. We have examples of using the Compass module with a wide range of popular controllers. Connections to the compass module. The compass module requires a 5v power supply at enough bond not is james world garbage the nominal 25mA.
There are two cmps03 of getting the bearing from the module. Pins 2,3 are the I2C interface and can be used to get a direct arduino of the bearing. Around 47k is ok, the values are not at all critical. Pin 4. The PWM signal is a pulse width modulated signal with the positive width of the pulse representing the angle. The pulse width varies from 1mS 0? The pulse is generated by a 16 bit timer in the processor giving a 1uS resolution, however I would not recommend measuring this to anything better than 0.
Pin 5 is used to indicate calibration is go here progress active low. Pin 6 is arduino of two ways to calibrate the compass, the other is writing 0xFF to the command register. Full calibration instructions are further down this page. The calibrate input has an on-board pull-up cmps03 and can be left unconnected after calibration. Pins 7 and 8 are currently unused.
They have on-board pull-up resistors and should be left unconnected.
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