pycom-documentation/content/firmwareapi/pycom/expansionboards/LTR329ALS01.md

Title

Title
Ambient Light sensor

The LTR329ALS01 is 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(pycoproc = None, sda = 'P22', scl = 'P21', gain = LTR329ALS01.ALS_GAIN_1X, integration = LTR329ALS01.ALS_INT_100, rate = LTR329ALS01.ALS_RATE_500)

Creates a LTR329ALS01 object. Constructor must be passed a Pycoproc or I2C object to successfully construct. The additional arguments are:

• gain: The light sensor ADC gain. see the Constants for values
• integration: Controls the integration time of the periodic measurement. See the Constants for values
• rate: The used sample rate in ms, must be set larger than the integration period. See the Constants for values

Methods

LTR329ALS01.light()

Read the light levels of both light sensors. Returns a tuple with two values for light levels: (blue, red), between 0-65535.

LTR329ALS01.lux()

Calculate the illuminance using the readings of the light sensor. Returns a single value in lux.

Constants

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_96X
• integration: ALS_INT_50, ALS_INT_100, ALS_INT_150, ALS_INT_200, ALS_INT_250, ALS_INT_300, ALS_INT_350, ALS_INT_400
• rate: ALS_RATE_50, ALS_RATE_100, ALS_RATE_200, ALS_RATE_500, ALS_RATE_1000, ALS_RATE_2000