81 lines
2.3 KiB
C++
81 lines
2.3 KiB
C++
/*
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This is a library for the BH1750_SoftFVI Digital Light Sensor breakout board.
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The BH1750_Soft 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_Soft library doesn't do this automatically.
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Datasheet: http://www.elechouse.com/elechouse/images/product/Digital%20light%20Sensor/bh1750fvi-e.pdf
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Written by Christopher Laws, March, 2013.
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*/
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#ifndef BH1750_Soft_h
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#define BH1750_Soft_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 <SoftwareWire.h>
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// Uncomment, to enable debug messages
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// #define BH1750_Soft_DEBUG
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// No active state
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#define BH1750_Soft_POWER_DOWN 0x00
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// Waiting for measurement command
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#define BH1750_Soft_POWER_ON 0x01
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// Reset data register value - not accepted in POWER_DOWN mode
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#define BH1750_Soft_RESET 0x07
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// Default MTreg value
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#define BH1750_Soft_DEFAULT_MTREG 69
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class BH1750_Soft {
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public:
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enum Mode
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{
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UNCONFIGURED = 0,
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// Measurement at 1 lux resolution. Measurement time is approx 120ms.
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CONTINUOUS_HIGH_RES_MODE = 0x10,
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// Measurement at 0.5 lux resolution. Measurement time is approx 120ms.
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CONTINUOUS_HIGH_RES_MODE_2 = 0x11,
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// Measurement at 4 lux resolution. Measurement time is approx 16ms.
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CONTINUOUS_LOW_RES_MODE = 0x13,
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// Measurement at 1 lux resolution. Measurement time is approx 120ms.
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ONE_TIME_HIGH_RES_MODE = 0x20,
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// Measurement at 0.5 lux resolution. Measurement time is approx 120ms.
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ONE_TIME_HIGH_RES_MODE_2 = 0x21,
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// Measurement at 4 lux resolution. Measurement time is approx 16ms.
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ONE_TIME_LOW_RES_MODE = 0x23
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};
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BH1750_Soft();
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bool begin(Mode mode, byte addr, SoftwareWire *theWire);
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bool configure(Mode mode);
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bool setMTreg(byte MTreg);
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float readLightLevel(bool maxWait = false);
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private:
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SoftwareWire *_wire;
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byte BH1750_Soft_I2CADDR;
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byte BH1750_Soft_MTreg = (byte)BH1750_Soft_DEFAULT_MTREG;
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// Correction factor used to calculate lux. Typical value is 1.2 but can
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// range from 0.96 to 1.44. See the data sheet (p.2, Measurement Accuracy)
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// for more information.
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const float BH1750_Soft_CONV_FACTOR = 1.2;
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Mode BH1750_Soft_MODE = UNCONFIGURED;
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};
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#endif
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