74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
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/*
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This is a library for the BH1750FVI Digital Light Sensor
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breakout board.
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The board uses I2C for communication. 2 pins are required to
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interface to the device.
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Datasheet:
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http://rohmfs.rohm.com/en/products/databook/datasheet/ic/sensor/light/bh1750fvi-e.pdf
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Written by Christopher Laws, March, 2013.
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*/
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#ifndef BH1750_h
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#define BH1750_h
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#if (ARDUINO >= 100)
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#include <Arduino.h>
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#else
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#include <WProgram.h>
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#endif
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#include "Wire.h"
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#define BH1750_DEBUG 0
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#define BH1750_I2CADDR 0x23
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// No active state
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#define BH1750_POWER_DOWN 0x00
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// Wating for measurment command
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#define BH1750_POWER_ON 0x01
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// Reset data register value - not accepted in POWER_DOWN mode
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#define BH1750_RESET 0x07
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// Start measurement at 1lx resolution. Measurement time is approx 120ms.
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#define BH1750_CONTINUOUS_HIGH_RES_MODE 0x10
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// Start measurement at 0.5lx resolution. Measurement time is approx 120ms.
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#define BH1750_CONTINUOUS_HIGH_RES_MODE_2 0x11
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// Start measurement at 4lx resolution. Measurement time is approx 16ms.
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#define BH1750_CONTINUOUS_LOW_RES_MODE 0x13
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// Start measurement at 1lx resolution. Measurement time is approx 120ms.
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// Device is automatically set to Power Down after measurement.
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#define BH1750_ONE_TIME_HIGH_RES_MODE 0x20
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// Start measurement at 0.5lx resolution. Measurement time is approx 120ms.
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// Device is automatically set to Power Down after measurement.
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#define BH1750_ONE_TIME_HIGH_RES_MODE_2 0x21
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// Start measurement at 1lx resolution. Measurement time is approx 120ms.
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// Device is automatically set to Power Down after measurement.
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#define BH1750_ONE_TIME_LOW_RES_MODE 0x23
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class BH1750 {
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public:
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BH1750();
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void begin(uint8_t mode = BH1750_CONTINUOUS_HIGH_RES_MODE);
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void configure(uint8_t mode);
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uint16_t readLightLevel(void);
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private:
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void write8(uint8_t data);
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};
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#endif
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