nodemcu-firmware/docs/modules/bmp085.md

# BMP085 Module
| Since  | Origin / Contributor  | Maintainer  | Source  |
| :----- | :-------------------- | :---------- | :------ |
| 2015-08-03 | [Konrad Beckmann](https://github.com/kbeckmann) | [Konrad Beckmann](https://github.com/kbeckmann) | [bmp085.c](../../app/modules/bmp085.c)|


This module provides access to the [BMP085](https://www.sparkfun.com/tutorials/253) temperature and pressure sensor. The module also works with BMP180.

## bmp085.setup()
Initializes the module.

#### Syntax
`bmp085.setup()`

#### Parameters
None

#### Returns
`nil`

## bmp085.temperature()
Samples the sensor and returns the temperature in celsius as an integer multiplied with 10.

#### Syntax
`bmp085.temperature()`

#### Returns
temperature multiplied with 10 (integer)

#### Example
```lua
local sda, scl = 1, 2
i2c.setup(0, sda, scl, i2c.SLOW)
bmp085.setup()
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
pressure in pascals (integer)

#### Example
```lua
local sda, scl = 1, 2
i2c.setup(0, sda, scl, i2c.SLOW) -- call i2c.setup() only once
bmp085.setup()
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
raw pressure sampling value (integer)