btnut/extras/teco_ssmall/tsl2550.h File Reference

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Detailed Description

Sensor interface for Teco Particles SSMALL boards.

Author:

Lukas Winterhalter

#include <sys/types.h>

Functions
short	tsl_calculate_lux (u_char channel0, u_char channel1)
u_char	tsl_init (void)
u_char	tsl_read (u_char *channel0, u_char *channel1)

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Function Documentation

short tsl_calculate_lux	(	u_char	channel0,
		u_char	channel1
	)

Converts channel values from both sensors to an approximated value in lux.

This is a simplified lux equation approximation using lookup tables. see http://www.taosinc.com/downloads/pdf/dn9b_tsl2550_Lux_Calculation.pdf

Parameters:

	channel0
	channel1

Returns:

Brightness in lux or -1 on error

Examples:

sensor-app/senso.c.

u_char tsl_init

(

void

)

Initialise the light sensor.

TwInit() has to be called before.

Returns:

0 on success, 1 otherwise

Examples:

sensor-app/senso.c.

u_char tsl_read	(	u_char *	channel0,
		u_char *	channel1
	)

Read sampled sensor data.

After this call, the sensor needs 800ms integration time, before the next values can be read.

Parameters:

	channel0	(all light)
	channel1	(IR-light only)

Returns:

0 on success, 1 otherwise

Examples:

sensor-app/senso.c.

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