BH1750 Class Reference

UPM C API for the DFRobot I2C BH1750 Light Sensor. More...

Detailed Description

• ID: bh1750
• Name: Digital Light Sensor
• Category: light
• Manufacturer: rohm dfrobot
• Connection: i2c
• Link: http://www.dfrobot.com/index.php?route=product/product&product_id=531

This driver was developed with the DFRobot Light Sensor based on the BH1750. It has a sensitivity of .5 10 65535 Lux. It supports voltages from 3-5vdc and is connected via I2C.

    // Instantiate a BH1750 sensor using defaults (I2C bus (0), using
    // the default I2C address (0x23), and setting the mode to highest
    // resolution, lowest power mode).
    upm::BH1750 sensor;

    // Every second, sample the BH1750 and output the measured lux value

    while (shouldRun) {
        cout << "Detected Light Level (lux): " << sensor.getLux() << endl;
        upm_delay(1);
    }

Public Member Functions
	BH1750 (int bus=BH1750_DEFAULT_I2C_BUS, int addr=BH1750_DEFAULT_I2C_ADDR, BH1750_OPMODES_T mode=BH1750_OPMODE_H2_ONCE)
	~BH1750 ()
void	reset ()
float	getLux ()
void	powerUp ()
void	powerDown ()
void	setOpmode (BH1750_OPMODES_T mode)

Protected Member Functions
void	sendCommand (uint8_t cmd)
uint16_t	readData ()

Protected Attributes
bh1750_context	m_bh1750

Constructor & Destructor Documentation

BH1750	(	int	bus = BH1750_DEFAULT_I2C_BUS,
		int	addr = BH1750_DEFAULT_I2C_ADDR,
		BH1750_OPMODES_T	mode = BH1750_OPMODE_H2_ONCE
	)

BH1750 object constructor (Analog mode)

Parameters

bus	The I2C bus to use
addr	The I2C address of the device
mode	The mode to start operation under. One of the BH1750_OPMODES_T values. The default is the highest precision, lowest power mode.

~BH1750

(

)

BH1750 object destructor

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Member Function Documentation

void reset

(

)

Reset the device. This doesn't really have much purpose. The device must be powered up for this command to work. In addition, this command will simply clear the measurement register to 0.

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float getLux

(

)

Get the measured light intensity in Lux.

Returns

The measured light intensity in Lux.

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void powerUp

(

)

Power up the device.

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void powerDown

(

)

Power down the device.

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void setOpmode

(

BH1750_OPMODES_T

mode

)

Setup the device to match the selected operating mode.

Parameters

mode	operating mode, one of the BH1750_OPMODES_T values

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void sendCommand ( uint8_t  cmd )

protected

Sends a command to the device via I2C.

Parameters

cmd	The command to write, one of the BH1750_CMD* values

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uint16_t readData ( )

protected

Read the 2 result bytes from the device via I2C.

Returns

Data read in from the device as a uint16_t

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Collaboration diagram for BH1750:

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The documentation for this class was generated from the following files:

• src/bh1750/bh1750.hpp
• src/bh1750/bh1750.cxx