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ruanhaishen
Nodemcu Firmware
Commits
5922fdba
Commit
5922fdba
authored
Jan 14, 2016
by
Konrad Beckmann
Browse files
BMP085: Added documentation
parent
517faf44
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docs/en/modules/bmp085.md
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5922fdba
# BMP085 Module
This module provides access to the BMP085 temperature and pressure sensor. The module also works with BMP180.
## bmp085.init()
Initializes the module and sets the pin configuration.
#### Syntax
`bmp085.init(sda, scl)`
#### Parameters
-
`sda`
data pin
-
`scl`
clock pin
#### Returns
`nil`
## bmp085.temperature()
Samples the sensor and returns the temperature in celsius as an integer multiplied with 10.
#### Syntax
`bmp085.temperature()`
#### Returns
`integer`
temperature multiplied with 10.
#### Example
```
lua
bmp085
.
init
(
1
,
2
)
local
t
=
bmp085
.
temperature
()
print
(
string.format
(
"Temperature: %s.%s degrees C"
,
t
/
10
,
t
%
10
))
```
## bmp085.pressure()
Samples the sensor and returns the pressure in pascal as an integer.
The optional
`oversampling_setting`
parameter determines for how long time the sensor samples data.
The default is
`3`
which is the longest sampling setting. Possible values are 0, 1, 2, 3.
See the data sheet for more information.
#### Syntax
`bmp085.pressure(oversampling_setting)`
#### Parameters
-
`oversampling_setting`
integer that can be 0, 1, 2 or 3.
#### Returns
`integer`
pressure in pascals.
#### Example
```
lua
bmp085
.
init
(
1
,
2
)
local
p
=
bmp085
.
pressure
()
print
(
string.format
(
"Pressure: %s.%s mbar"
,
p
/
100
,
p
%
100
))
```
## bmp085.pressure_raw()
Samples the sensor and returns the raw pressure in internal units. Might be useful if you need higher precision.
#### Syntax
`bmp085.pressure_raw(oversampling_setting)`
#### Parameters
-
`oversampling_setting`
integer that can be 0, 1, 2 or 3.
#### Returns
`integer`
raw pressure sampling value
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