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Altimetry
1.
2.
3.
Alti/Baro
Waterlevel
Inertial
Press
UPorDN
1.
a.
b.
Altimetry Press
MPXM2102A UPorDN
MPL115A2
Raw Value Altitude
0x017c1d 459 m
2(LP) value Pressure
4.
Additional
‘1’
c.
Experimental
‘a’
0x017c1f 95.365 kPa
ENT
Select the MPXM2102A,
ENT
Note the way that the output is displayed. The Raw value of the
option ‘a’ for higher resolution,
amplified pressure readings
for Altimetry.
24-bit ADC value is displayed on the left. The bottom left has the
raw value after it passes two low pass filters in software. This value
is mores stable but takes longer to update.
On the right the Altitude is displayed. This is the pressure
converted to altitude in (m). The Pressure corresponding to the
ADC value is shown in the bottom right.
The board can be placed on the table. Note the Altitude
measurement as it stabilizes. Then raise it above your head as a
‘1m’ increase. The value should go up by 1m. Place on the table
again. It should drop to the original value. Place on the floor, it will
again decrement 1m. Note that ambient pressure from A/C units
can affect this value drastically.
Barometer Compensated Pressure Output
1.
Altimetry Press
MPL115A2 Raw Values
6 Coefficients
Compensated Pressure
a.
b.
MPXM2102A UPorDN
MPL115A2
Press ADC
Temp ADC
74c0 0467
6b40 0428
ao = 3dc4 c11 = f8a0
b1 = bd7a c12 = 2flc
PComp = 9778 kPa
Altitude = 365 m
c.
Experimental
‘b’
ENT
ENTER for Coefficients
ENT
The values for the MPL115A
are shown here. To the left are
the Pressure and Temp ADC
b2 = c299 c22 = 0dc0
ENT
Values of the Coefficients are
shown here. These are used
for the next step in calculating
ENT
Compensated Pressure is
displayed. This is with an
accuracy of ±1kPa.
values in their raw form in
HEX. To the right of them are
the compensated Pressure.
the shifted values displayed in
decimal.
ALARM System
Enter your Threshold
Press ENT to continue to the
Alarm section.
ALARM sounds when
Threshold is reached
0.50
kPa
Press.
96.574 kPa
Enter for Activation
ENT
ALARM
97.324
Continued from the MPL115A
compensated Barometer
section above. Press UP and
DN to set the Alarm Threshold
in increments of 0.25kPa.
Press ENT to activate the
Alarm
Alarm is now Active. Note the
outputs of the current Pressure
in kPa, and the Alarm
Threshold point. Once
crossed, the red LED will flash
as the buzzer sounds. Try
activating by pressurizing the
MPL115A. This can be done
with a plastic syringe with
rubber tubing at the end to
make an air tight fit.
AN3956
Sensors
Freescale Semiconductor
9
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