Library + example sketch for BH1750 I2C lumincance sensor

hardware/arduino/zuno/libraries/ZUNO_BH1750/ZUNO_BH1750.cpp

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+/*************************************************** 
+  This is a library for the BH1750(FVI) light sensor
+
+  This sensor use I2C to communicate, 2 pins are required to  
+  interface
+
+  Datasheet:
+  http://rohmfs.rohm.com/en/products/databook/datasheet/ic/sensor/light/bh1750fvi-e.pdf
+  Based on BH1750 lib written by Christopher Laws, March, 2013.
+	Adapted to ZUNO
+  ****************************************************/
+
+#include "ZUNO_BH1750.h"
+#include "Wire.h"
+
+#define BH1750_DEBUG 0
+
+BH1750::BH1750() {
+
+}
+
+void BH1750::begin(uint8_t mode, uint8_t addr) {
+
+  Wire.begin();
+  // initialization sensor
+  configure(mode, addr);
+}
+
+void BH1750::configure(uint8_t mode, uint8_t addr) {
+
+	Wire.beginTransmission(addr);
+	switch (mode) {
+			case BH1750_CONTINUOUS_HIGH_RES_MODE:
+			case BH1750_CONTINUOUS_HIGH_RES_MODE_2:
+			case BH1750_CONTINUOUS_LOW_RES_MODE:
+			case BH1750_ONE_TIME_HIGH_RES_MODE:
+			case BH1750_ONE_TIME_HIGH_RES_MODE_2:
+			case BH1750_ONE_TIME_LOW_RES_MODE:
+					// apply a valid mode change
+					Wire.write(mode);
+		delay(10);
+					break;
+			default:
+					// Invalid measurement mode
+					#if BH1750_DEBUG == 1
+					Serial.println("Invalid measurement mode");
+					#endif
+					break;
+	}
+	Wire.endTransmission();
+}
+
+void BH1750::powerOn(uint8_t addr) {
+	Wire.beginTransmission(addr);
+  Wire.write(BH1750_POWER_ON);
+  Wire.endTransmission();
+}
+void BH1750::powerDown(uint8_t addr) {
+	Wire.beginTransmission(addr);
+  Wire.write(BH1750_POWER_DOWN);
+  Wire.endTransmission();
+}
+void BH1750::reset(uint8_t addr) {
+	Wire.beginTransmission(addr);
+  Wire.write(BH1750_RESET);
+  Wire.endTransmission();
+}
+
+uint16_t BH1750::readLightLevel(uint8_t addr) {
+
+  uint16_t level;
+
+  Wire.beginTransmission(addr);
+  Wire.requestFrom(addr, 2);
+
+  level = Wire.read();
+  level <<= 8;
+  level |= Wire.read();
+
+  Wire.endTransmission();
+
+#if BH1750_DEBUG == 1
+  Serial.print("Raw light level: ");
+  Serial.println(level);
+#endif
+
+  level = level/1.2; // convert to lux
+
+#if BH1750_DEBUG == 1
+  Serial.print("Light level: ");
+  Serial.println(level);
+#endif
+  return level;
+}

hardware/arduino/zuno/libraries/ZUNO_BH1750/ZUNO_BH1750.h

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+/*************************************************** 
+  This is a library for the BH1750(FVI) light sensor
+
+  This sensor use I2C to communicate, 2 pins are required to  
+  interface
+
+  Datasheet:
+  http://rohmfs.rohm.com/en/products/databook/datasheet/ic/sensor/light/bh1750fvi-e.pdf
+  Based on BH1750 lib written by Christopher Laws, March, 2013.
+	Adapted to ZUNO
+  ****************************************************/
+
+#ifndef BH1750_h
+#define BH1750_h
+
+#include "Arduino.h"
+
+// BH1750 address on the I2C bus, depending on the level of ADDR pin
+#define BH1750_I2CADDR_L	0x23
+#define BH1750_I2CADDR_H	0x5C
+// define low address as default
+#define BH1750_I2CADDR 		BH1750_I2CADDR_L
+
+// No active state
+#define BH1750_POWER_DOWN 					0x00
+
+// Wating for measurment command
+#define BH1750_POWER_ON 					0x01
+
+// Reset data register value - not accepted in POWER_DOWN mode
+#define BH1750_RESET 						0x07
+
+// Start measurement at 1 lx resolution. Measurement time is approx 120ms.
+#define BH1750_CONTINUOUS_HIGH_RES_MODE  	0x10
+
+// Start measurement at 0.5 lx resolution. Measurement time is approx 120ms.
+#define BH1750_CONTINUOUS_HIGH_RES_MODE_2	0x11
+
+// Start measurement at 4 lx resolution. Measurement time is approx 16ms.
+#define BH1750_CONTINUOUS_LOW_RES_MODE  	0x13
+
+// Start measurement at 1 lx resolution. Measurement time is approx 120ms.
+// Device is automatically set to Power Down after measurement.
+#define BH1750_ONE_TIME_HIGH_RES_MODE  		0x20
+
+// Start measurement at 0.5 lx resolution. Measurement time is approx 120ms.
+// Device is automatically set to Power Down after measurement.
+#define BH1750_ONE_TIME_HIGH_RES_MODE_2  	0x21
+
+// Start measurement at 1 lx resolution. Measurement time is approx 120ms.
+// Device is automatically set to Power Down after measurement.
+#define BH1750_ONE_TIME_LOW_RES_MODE  		0x23
+
+// max measurement times in ms
+#define BH1750_LOW_RES_MODE_MAXTIME			24
+#define BH1750_HIGH_RES_MODE_MAXTIME		180
+#define BH1750_HIGH_RES_MODE_2_MAXTIME	180
+
+
+class BH1750 {
+ public:
+  BH1750();
+  void 		begin(uint8_t mode = BH1750_CONTINUOUS_HIGH_RES_MODE, uint8_t addr = BH1750_I2CADDR_L);
+  void 		configure(uint8_t mode = BH1750_CONTINUOUS_HIGH_RES_MODE, uint8_t addr = BH1750_I2CADDR_L);
+  void		powerOn(uint8_t addr = BH1750_I2CADDR_L);
+	void		powerDown(uint8_t addr = BH1750_I2CADDR_L);
+	void		reset(uint8_t addr = BH1750_I2CADDR_L);
+  uint16_t 	readLightLevel(uint8_t addr = BH1750_I2CADDR_L);
+
+ private:
+  uint8_t test; // dummy to get rid of error during compilation if no private part exist
+};
+
+#endif
+

hardware/examples/BH1750_LibBsp/BH1750_LibBsp.ino

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+// demo sketch for connecting I2C light sensor BH1750 to Z-Uno using ZUNO_BH1750 library
+
+#include "ZUNO_BH1750.h"
+#define DEBUG
+
+BH1750 bh1750;
+
+// BH1750 address on the bus: BH1750_I2CADDR_L = 0x23
+#define BH1750_I2CADDR  BH1750_I2CADDR_L
+
+word lightLux;
+
+// set up channel
+//ZUNO_SETUP_CHANNELS(
+//      ZUNO_SENSOR_MULTILEVEL(ZUNO_SENSOR_MULTILEVEL_TYPE_LUMINANCE,
+//                             SENSOR_MULTILEVEL_SCALE_LUX,  
+//                             SENSOR_MULTILEVEL_SIZE_TWO_BYTES, 
+//                             SENSOR_MULTILEVEL_PRECISION_ZERO_DECIMALS, 
+//                             getterLight)
+//);
+// channel definition as one line to get error message reported on correct line (will be fixed in later version of ZUNO)
+ZUNO_SETUP_CHANNELS( ZUNO_SENSOR_MULTILEVEL(ZUNO_SENSOR_MULTILEVEL_TYPE_LUMINANCE, SENSOR_MULTILEVEL_SCALE_LUX, SENSOR_MULTILEVEL_SIZE_TWO_BYTES, SENSOR_MULTILEVEL_PRECISION_ZERO_DECIMALS, getterLight));
+
+void setup() {
+  #ifdef DEBUG
+      Serial.begin();
+  #endif
+
+  // Start continous measurement in HIGH_RES_MODE at 1 lx resolution
+  // Measurement time is approx 120ms. max time 180ms defined as BH1750_HIGH_RES_MODE_MAXTIME
+  bh1750.begin(BH1750_CONTINUOUS_HIGH_RES_MODE, BH1750_I2CADDR);
+
+  #ifdef DEBUG
+    Serial.println("start");
+  #endif
+}
+
+void loop() {
+  lightLux = bh1750.readLightLevel(BH1750_I2CADDR);
+
+  #ifdef DEBUG
+    Serial.print("light = ");
+    Serial.println(lightLux);
+  #endif
+  zunoSendReport(1); 
+  // send every 30 sec
+  delay(30000);
+}
+
+word getterLight() {
+  return lightLux;
+}
+