Library for digital light sensor BH1750 (GY-30). SPI Test Comunication with ArduinoMega
BH1750.cpp
- Committer:
- vrabec
- Date:
- 2014-08-18
- Revision:
- 0:58ee8a917618
- Child:
- 1:1a0ca36b6230
File content as of revision 0:58ee8a917618:
/* This is a library for the BH1750FVI (GY-30) Digital Light Sensor breakout board. The board uses I2C for communication. 2 pins are required to interface to the device and in most cases also pull up resistors. Datasheet: http://rohmfs.rohm.com/en/products/databook/datasheet/ic/sensor/light/bh1750fvi-e.pdf Inspired by Christopher Laws, March, 2013. Written by Michal Stehlik, August, 2014. */ #include "BH1750.h" BH1750::BH1750(PinName sda, PinName scl) : i2c(sda,scl) { rawDataBuffer[0] = 0; rawDataBuffer[1] = 0; status = -1; } void BH1750::init(char mode) { configure(mode); } void BH1750::configure(char mode) { char data[1]; 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: data[0] = mode; status = i2c.write(BH1750_I2CADDR, data, sizeof(data), false); wait_ms(10); break; default: break; } } float BH1750::readIntesity(void) { status = i2c.read(BH1750_I2CADDR, rawDataBuffer, 2, false); if(status != 0) { return -1; } //success float result = 0; result = ((rawDataBuffer[0]<<8)|rawDataBuffer[1])/1.2; return result; } int BH1750::getStatus(void) { return status; } char* BH1750::getRawData(void) { return rawDataBuffer; }