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arduino-cli/libraries/BH1750/BH1750.h

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+/*
+
+  This is a library for the BH1750FVI Digital Light Sensor breakout board.
+
+  The BH1750 board uses I2C for communication. Two pins are required to
+  interface to the device. Configuring the I2C bus is expected to be done
+  in user code. The BH1750 library doesn't do this automatically.
+
+  Datasheet: http://www.elechouse.com/elechouse/images/product/Digital%20light%20Sensor/bh1750fvi-e.pdf
+
+  Written by Christopher Laws, March, 2013.
+
+*/
+
+#ifndef BH1750_h
+#define BH1750_h
+
+#if (ARDUINO >= 100)
+  #include <Arduino.h>
+#else
+  #include <WProgram.h>
+#endif
+
+#include "Wire.h"
+
+// Uncomment, to enable debug messages
+// #define BH1750_DEBUG
+
+// No active state
+#define BH1750_POWER_DOWN 0x00
+
+// Waiting for measurement command
+#define BH1750_POWER_ON 0x01
+
+// Reset data register value - not accepted in POWER_DOWN mode
+#define BH1750_RESET 0x07
+
+// Default MTreg value
+#define BH1750_DEFAULT_MTREG 69
+
+class BH1750 {
+
+  public:
+
+    enum Mode
+    {
+      UNCONFIGURED = 0,
+      // Measurement at 1 lux resolution. Measurement time is approx 120ms.
+      CONTINUOUS_HIGH_RES_MODE  = 0x10,
+      // Measurement at 0.5 lux resolution. Measurement time is approx 120ms.
+      CONTINUOUS_HIGH_RES_MODE_2 = 0x11,
+      // Measurement at 4 lux resolution. Measurement time is approx 16ms.
+      CONTINUOUS_LOW_RES_MODE = 0x13,
+      // Measurement at 1 lux resolution. Measurement time is approx 120ms.
+      ONE_TIME_HIGH_RES_MODE = 0x20,
+      // Measurement at 0.5 lux resolution. Measurement time is approx 120ms.
+      ONE_TIME_HIGH_RES_MODE_2 = 0x21,
+      // Measurement at 4 lux resolution. Measurement time is approx 16ms.
+      ONE_TIME_LOW_RES_MODE = 0x23
+    };
+
+    BH1750(byte addr = 0x23);
+    bool begin(Mode mode = CONTINUOUS_HIGH_RES_MODE);
+    bool configure(Mode mode);
+    bool setMTreg(byte MTreg);
+    float readLightLevel(bool maxWait = false);
+
+  private:
+    byte BH1750_I2CADDR;
+    byte BH1750_MTreg = (byte)BH1750_DEFAULT_MTREG;
+    // Correction factor used to calculate lux. Typical value is 1.2 but can
+    // range from 0.96 to 1.44. See the data sheet (p.2, Measurement Accuracy)
+    // for more information.
+    const float BH1750_CONV_FACTOR = 1.2;
+    Mode BH1750_MODE = UNCONFIGURED;
+
+};
+
+#endif