OPT3001 Ambient Light Sensor

Driver for the Texas Instruments OPT3001 sensor. More...

Detailed Description

Driver for the Texas Instruments OPT3001 sensor.

The TI OPT3001 (Ambient Light Sensor) measures the intensity of visible light with a spectal response comparable to the human eye, with simultaneous rejection of infrared light. The conversion time, mode of conversion and the interrupt reporting mechanism mode can be set by the sensor initialization. After initialization the raw sensor values can be read. The ambient light can be calculated as follows:

Result register translation into lux:

Where LSB_Size:

The calculation is wrapped from TI OPT3001 Ambient Light Sensor (ALS) datasheet (Rev. C).

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

Modules
	OPT3001 Ambient Light Sensor driver compile configuration

Files
file	opt3001.h
	Interface definition for the OPT3001 sensor driver.
file	opt3001_params.h
	Default configuration for OPT3001 devices.
file	opt3001_regs.h
	Register definitions for OPT3001 devices.

Data Structures
struct	opt3001_params_t
	Parameters needed for device initialization. More...
struct	opt3001_t
	Device descriptor for OPT3001 sensors. More...

Enumerations
enum	{ OPT3001_OK, OPT3001_ERROR_BUS, OPT3001_ERROR_DEV, OPT3001_ERROR }
	OPT3001 specific return values. More...

Functions
int	opt3001_init (opt3001_t *dev, const opt3001_params_t *params)
	Initialize the OPT3001 sensor driver. More...
int	opt3001_reset (const opt3001_t *dev)
	Reset the OPT3001 sensor while simultaneous deactivating measurements. More...
int	opt3001_set_active (const opt3001_t *dev)
	Set active mode, this enables periodic measurements. More...
int	opt3001_read_lux (const opt3001_t *dev, uint32_t *convl)
	Read sensor's raw data and convert it to milliLux. More...

Conversion time
#define	OPT3001_CONVERSION_TIME_100_MS   (0x0000)
	Conversion time of 100ms.
#define	OPT3001_CONVERSION_TIME_800_MS   (0x0800)
	Conversion time of 800ms.

Enumeration Type Documentation

anonymous enum

anonymous enum

OPT3001 specific return values.

Enumerator
OPT3001_OK	Success, no error.
OPT3001_ERROR_BUS	I2C bus error.
OPT3001_ERROR_DEV	Internal device error.
OPT3001_ERROR	General error.

Definition at line 112 of file opt3001.h.

Function Documentation

opt3001_init()

int opt3001_init	(	opt3001_t *	dev,
		const opt3001_params_t *	params
	)

Initialize the OPT3001 sensor driver.

Parameters

[out]	dev	device descriptor of sensor to initialize
[in]	params	configuration parameters

Returns

0 on success

-OPT3001_ERROR_BUS on I2C bus error

-OPT3001_ERROR_DEV if sensor test failed

opt3001_read_lux()

int opt3001_read_lux	(	const opt3001_t *	dev,
		uint32_t *	convl
	)

Read sensor's raw data and convert it to milliLux.

Parameters

[in]	dev	device descriptor of sensor
[out]	convl	ambient light in milliLux

Returns

0 on success

-1 on error

opt3001_reset()

int opt3001_reset

(

const opt3001_t *

dev

)

Reset the OPT3001 sensor while simultaneous deactivating measurements.

Afterwards the sensor should be idle.

Parameters

[out]

dev

device descriptor of sensor

Returns

0 on success

-1 on error

opt3001_set_active()

int opt3001_set_active

(

const opt3001_t *

dev

)

Set active mode, this enables periodic measurements.

Parameters

[in]

dev

device descriptor of sensor

Returns

0 on success

-1 on error