Pysense API

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

integration

rate

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