Pysense
This chapter describes the various libraries which are designed for the Pysense board. This includes details about the various methods and classes available for each of the Pysense’s sensors.
3-Axis Accelerometer (LIS2HH12)
Pysense has a 3-Axis Accelerometer that provides outputs for acceleration as well as roll, pitch and yaw.
Constructors
class LIS2HH12(pysense = None, sda = 'P22', scl = 'P21')
Creates a LIS2HH12 object, that will return values for acceleration, roll, pitch and yaw. Constructor must be passed a Pysense or I2C object to successfully construct.
Methods
LIS2HH12.acceleration()
Read the acceleration from the LIS2HH12. Returns a tuple with the 3 values of acceleration (G).
LIS2HH12.roll()
Read the current roll from the LIS2HH12. Returns a float in degrees in the range -180 to 180.
LIS2HH12.pitch()
Read the current pitch from the LIS2HH12. Returns a float in degrees in the range -90 to 90. Once the board tilts beyond this range the values will repeat. This is due to a lack of yaw measurement, making it not possible to know the exact orientation of the board.
Digital Ambient Light Sensor (LTR-329ALS-01)
Pysense has a dual light sensor that provides outputs for external light levels in lux. See the datasheet for more information about the wavelengths of the two sensors.
Constructors
class LTR329ALS01(pysense = None, sda = 'P22', scl = 'P21', gain = ALS_GAIN_1X, integration = ALS_INT_100, rate = ALS_RATE_500)
Creates a LTR329ALS01 object, that will return values for light in lux. Constructor must be passed a Pysense or I2C object to successfully construct.
Methods
LTR329ALS01.light()
Read the light levels of both LTR329ALS01 sensors. Returns a tuple with two values for light levels in lux.
Arguments
The following arguments may be passed into the constructor.
gain:
ALS_GAIN_1X,ALS_GAIN_2X,ALS_GAIN_4X,ALS_GAIN_8X,ALS_GAIN_48X,ALS_GAIN_96Xintegration:
ALS_INT_50,ALS_INT_100,ALS_INT_150,ALS_INT_200,ALS_INT_250,ALS_INT_300,ALS_INT_350,ALS_INT_400rate:
ALS_RATE_50,ALS_RATE_100,ALS_RATE_200,ALS_RATE_500,ALS_RATE_1000,ALS_RATE_2000
Humidity and Temperature Sensor (SI7006A20)
Pysense has a Humidity and Temperature sensor that provides values of relative humidity and external temperature.
Constructors
class SI7006A20(pysense = None, sda = 'P22', scl = 'P21')
Creates a SI7006A20 object, that will return values for humidity (%) and temperature ('C). Constructor must be passed a Pysense or I2C object to successfully construct.
Methods
SI7006A20.humidity()
Read the relative humidity of the SI7006A20. Returns a float with the percentage relative humidity.
SI7006A20.temperature()
Read the external temperature of the SI7006A20. Returns a float with the temperature.
Barometric Pressure Sensor with Altimeter (MPL3115A2)
Pysense has a Barometric Pressure sensor that provides readings for pressure, altitude as well as an additional temperature sensor.
Constructors
class MPL3115A2(pysense = None, sda = 'P22', scl = 'P21', mode = PRESSURE)
Creates a MPL3115A2 object, that will return values for pressure (Pa), altitude (m) and temperature ('C). Constructor must be passed a Pysense or I2C object to successfully construct.
Methods
MPL3115A2.pressure()
Read the atmospheric pressure of the MPL3115A2. Returns a float with the pressure in (Pa).
MPL3115A2.altitude()
Read the altitude of the MPL3115A2. Returns a float with the altitude in (m).
MPL3115A2.temperature()
Read the temperature of the MPL3115A2. Returns a float with the temperature in ('C).
Arguments
The following arguments may be passed into the constructor.
mode:
PRESSURE,ALTITUDE
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