1.9 KiB
BMP085 Module
| Since | Origin / Contributor | Maintainer | Source |
|---|---|---|---|
| 2015-08-03 | Konrad Beckmann | Konrad Beckmann | bmp085.c |
This module provides access to the BMP085 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
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
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)