ISL29020 light sensor

Device driver for the ISL29020 light sensor.

This driver provides [S]ensor [A]ctuator [U]ber [L]ayer capabilities.

enum isl29020_mode_t

ISL29020_MODE_AMBIENT = 0

set sensor to detect ambient light

ISL29020_MODE_IR = 1

set sensor to detect infrared light

enum isl29020_range_t

ISL29020_RANGE_1K = 0

set range to 0-1000 lux

ISL29020_RANGE_4K = 1

set range to 0-4000 lux

ISL29020_RANGE_16K = 2

set range to 0-16000 lux

ISL29020_RANGE_64K = 3

set range to 0-64000 lux

int isl29020_init(isl29020_t * dev, const isl29020_params_t * params)

Initialize a new ISL29020 device.

Parameters

dev:device descriptor of an ISL29020 device params:initialization parameters

Return values

• 0 on success
• -1 on error

int isl29020_read(const isl29020_t * dev)

Read a lighting value from the sensor, the result is given in lux.

Parameters

dev:device descriptor of an ISL29020 device

Return values

• the measured brightness in lux
• -1 on error

int isl29020_enable(const isl29020_t * dev)

Enable the given sensor.

Parameters

dev:device descriptor of an ISL29020 device

Return values

• 0 on success
• -1 on error

int isl29020_disable(const isl29020_t * dev)

Disable the given sensor.

Parameters

dev:device descriptor of an ISL29020 device

Return values

• 0 on success
• -1 on error

ISL29020_DEFAULT_ADDRESS

The sensors default I2C address.

0x44

struct isl29020_params_t

Data structure holding the full set of configuration parameters.

i2c.h::i2c_t i2c

I2C bus the device is connected to.

uint8_t addr

address on that bus

isl29020.h::isl29020_range_t range

range setting to use

isl29020.h::isl29020_mode_t mode

measurement mode to use

struct isl29020_t

Device descriptor for ISL29020 sensors.

isl29020_params_t params

device initialization parameters

float lux_fac

factor to calculate actual lux value