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75 lines
2.0 KiB
C++
75 lines
2.0 KiB
C++
/*
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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 BH1750 board uses I2C for communication. Two pins are required to
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interface to the device. Configuring the I2C bus is expected to be done
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in user code. The BH1750 library doesn't do this automatically.
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Datasheet: 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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// Uncomment, to enable debug messages
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// #define BH1750_DEBUG
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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 (byte addr = 0x23);
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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(bool maxWait = false);
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private:
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int BH1750_I2CADDR;
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uint8_t BH1750_MODE;
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};
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#endif
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