Martinmm at 01:43, 10 March 2013

2013-03-10T01:43:36Z

← Older revision		Revision as of 19:43, 9 March 2013
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	The Freescale MPL3115A2 is a barometer/pressure sensor.		The Freescale MPL3115A2 is a barometer/pressure sensor.

			The device was tested in a simple static noise comparsion [[Baro_comparsion\|setup]].

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Martinmm: Created page with "NOTOC Freescale MPL3115A2 barometer == Overview == The Freescale MPL3115A2 is a barometer/pressure sensor. {|border="1" |-valign="top" |…"

2013-03-09T23:25:14Z

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__NOTOC__
[[Image:Mpl3115a2.jpg|thumb|right|Freescale MPL3115A2 barometer]]
== Overview ==

The Freescale MPL3115A2 is a barometer/pressure sensor.

{|border="1"
|-valign="top"
||Module name||sensors/baro_mpl3115
|-
|Sensor type
|barometer, temperature
|-
|Range (baro)
|30 kPa .. 1100 kPa
|-
|Range (temp)
| -40°C .. +85°C
|-
|Resolution (baro)
|0.25 Pa
|-
|Resolution (temp)
|0.01°C
|-
|Refresh rate
|5Hz
|-
|I2C address
|0xC0
|}

[http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MPL3115A2 Product home page]

[http://cache.freescale.com/files/sensors/doc/data_sheet/MPL3115A2.pdf Product data sheet]

== Hardware ==

The sensor directly interfaces to the 3.3V I2C port of the autopilots and is supplied by +3.3V.

Supplier:
[http://www.sparkfun.com/products/9694 Sparkfun]

=== Wiring ===

{|border="1"
|-valign="top"
||'''Autopilot I2C pin'''||'''Autopilot I2C'''||'''Freescale MPL3115A2'''
|-
|1
|GND
|GND
|-
|2
|
|
|-
|3
| +3.3V
|VCC
|-
|4
|SDA
|SDA
|-
|5
|SCL
|SCL
|}

== Usage ==

To use it load the baro_mpl3115 module:
{{Box Code|conf/airframes/myplane.xml|
<source lang="xml">
<modules>
...
<load name="baro_mpl3115.xml"/>
</modules>
</source>
}}

=== Configuration ===

To see the sensors data in the log file set the SENSOR_SYNC_SEND in your airframe file. Every time new data is available it will be sent directly. For pressure reading instead of altitude set MPL3115_ALT_MODE to zero.
{{Box Code|conf/airframes/myplane.xml|
<source lang="xml">
<modules>
...
<load name="baro_mpl3115.xml">
<define name="SENSOR_SYNC_SEND"/>
<define name="MPL3115_ALT_MODE" value=0/>
</load>
</modules>
</source>
}}

===Result message===

Unfortunately only the raw values are written to the log file (to be changed), they need to be multiplied by the coefficient given in conf/messages.xml.
{{Box Code|conf/messages.xml|
<source lang="xml">
<message name="MPL3115_BARO" id="68">
<field name="pressure" type="uint32" alt_unit="Pa" alt_unit_coef="0.25"/>
<field name="temp" type="int16" alt_unit="degC" alt_unit_coef="0.0625"/>
<field name="alt" type="float" unit="m"/>
</message>
</source>
}}

Sample log file lines (pressure mode)
18.840 123 MPL3115_BARO 395099 353 0.
19.041 123 MPL3115_BARO 395143 353 0.
19.243 123 MPL3115_BARO 395142 353 0.
19.440 123 MPL3115_BARO 395130 353 0.

[[Category:User_Documentation]] [[Category:Modules]]

Module/Freescale MPL3115A2 - Revision history

Martinmm at 01:43, 10 March 2013

Martinmm: Created page with "__NOTOC__ Freescale MPL3115A2 barometer == Overview == The Freescale MPL3115A2 is a barometer/pressure sensor. {|border="1" |-valign="top" |…"

Martinmm: Created page with "NOTOC Freescale MPL3115A2 barometer == Overview == The Freescale MPL3115A2 is a barometer/pressure sensor. {|border="1" |-valign="top" |…"