BMP085: Added documentation

docs/en/modules/bmp085.md

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+# 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