93 lines
1.8 KiB
C++
Executable file
93 lines
1.8 KiB
C++
Executable file
/*
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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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Written by Christopher Laws, March, 2013.
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*/
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#include "BH1750.h"
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#include <util/delay.h>
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BH1750::BH1750() {}
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void BH1750::begin(uint8_t mode) {
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Wire.begin();
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//write8(mode);
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configure(mode);
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}
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void BH1750::configure(uint8_t mode) {
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switch (mode) {
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case BH1750_CONTINUOUS_HIGH_RES_MODE:
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case BH1750_CONTINUOUS_HIGH_RES_MODE_2:
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case BH1750_CONTINUOUS_LOW_RES_MODE:
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case BH1750_ONE_TIME_HIGH_RES_MODE:
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case BH1750_ONE_TIME_HIGH_RES_MODE_2:
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case BH1750_ONE_TIME_LOW_RES_MODE:
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// apply a valid mode change
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write8(mode);
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_delay_ms(10);
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break;
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default:
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// Invalid measurement mode
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#if BH1750_DEBUG == 1
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Serial.println("Invalid measurement mode");
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#endif
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break;
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}
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}
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uint16_t BH1750::readLightLevel(void) {
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uint16_t level;
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Wire.beginTransmission(BH1750_I2CADDR);
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Wire.requestFrom(BH1750_I2CADDR, 2);
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#if (ARDUINO >= 100)
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level = Wire.read();
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level <<= 8;
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level |= Wire.read();
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#else
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level = Wire.receive();
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level <<= 8;
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level |= Wire.receive();
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#endif
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Wire.endTransmission();
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#if BH1750_DEBUG == 1
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Serial.print("Raw light level: ");
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Serial.println(level);
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#endif
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level = level/1.2; // convert to lux
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#if BH1750_DEBUG == 1
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Serial.print("Light level: ");
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Serial.println(level);
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#endif
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return level;
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}
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/*********************************************************************/
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void BH1750::write8(uint8_t d) {
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Wire.beginTransmission(BH1750_I2CADDR);
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#if (ARDUINO >= 100)
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Wire.write(d);
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#else
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Wire.send(d);
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#endif
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Wire.endTransmission();
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}
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