Library for digital light sensor BH1750 (GY-30). SPI Test Comunication with ArduinoMega
BH1750.cpp@0:58ee8a917618, 2014-08-18 (annotated)
- Committer:
- vrabec
- Date:
- Mon Aug 18 18:01:09 2014 +0000
- Revision:
- 0:58ee8a917618
- Child:
- 1:1a0ca36b6230
Initial commit
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
vrabec | 0:58ee8a917618 | 1 | /* |
vrabec | 0:58ee8a917618 | 2 | |
vrabec | 0:58ee8a917618 | 3 | This is a library for the BH1750FVI (GY-30) Digital Light Sensor |
vrabec | 0:58ee8a917618 | 4 | breakout board. |
vrabec | 0:58ee8a917618 | 5 | |
vrabec | 0:58ee8a917618 | 6 | The board uses I2C for communication. 2 pins are required to |
vrabec | 0:58ee8a917618 | 7 | interface to the device and in most cases also pull up resistors. |
vrabec | 0:58ee8a917618 | 8 | |
vrabec | 0:58ee8a917618 | 9 | Datasheet: |
vrabec | 0:58ee8a917618 | 10 | http://rohmfs.rohm.com/en/products/databook/datasheet/ic/sensor/light/bh1750fvi-e.pdf |
vrabec | 0:58ee8a917618 | 11 | |
vrabec | 0:58ee8a917618 | 12 | Inspired by Christopher Laws, March, 2013. |
vrabec | 0:58ee8a917618 | 13 | Written by Michal Stehlik, August, 2014. |
vrabec | 0:58ee8a917618 | 14 | |
vrabec | 0:58ee8a917618 | 15 | */ |
vrabec | 0:58ee8a917618 | 16 | |
vrabec | 0:58ee8a917618 | 17 | #include "BH1750.h" |
vrabec | 0:58ee8a917618 | 18 | |
vrabec | 0:58ee8a917618 | 19 | BH1750::BH1750(PinName sda, PinName scl) : i2c(sda,scl) |
vrabec | 0:58ee8a917618 | 20 | { |
vrabec | 0:58ee8a917618 | 21 | rawDataBuffer[0] = 0; |
vrabec | 0:58ee8a917618 | 22 | rawDataBuffer[1] = 0; |
vrabec | 0:58ee8a917618 | 23 | status = -1; |
vrabec | 0:58ee8a917618 | 24 | } |
vrabec | 0:58ee8a917618 | 25 | |
vrabec | 0:58ee8a917618 | 26 | void BH1750::init(char mode) |
vrabec | 0:58ee8a917618 | 27 | { |
vrabec | 0:58ee8a917618 | 28 | configure(mode); |
vrabec | 0:58ee8a917618 | 29 | } |
vrabec | 0:58ee8a917618 | 30 | |
vrabec | 0:58ee8a917618 | 31 | |
vrabec | 0:58ee8a917618 | 32 | void BH1750::configure(char mode) |
vrabec | 0:58ee8a917618 | 33 | { |
vrabec | 0:58ee8a917618 | 34 | char data[1]; |
vrabec | 0:58ee8a917618 | 35 | switch (mode) { |
vrabec | 0:58ee8a917618 | 36 | case BH1750_CONTINUOUS_HIGH_RES_MODE: |
vrabec | 0:58ee8a917618 | 37 | case BH1750_CONTINUOUS_HIGH_RES_MODE_2: |
vrabec | 0:58ee8a917618 | 38 | case BH1750_CONTINUOUS_LOW_RES_MODE: |
vrabec | 0:58ee8a917618 | 39 | case BH1750_ONE_TIME_HIGH_RES_MODE: |
vrabec | 0:58ee8a917618 | 40 | case BH1750_ONE_TIME_HIGH_RES_MODE_2: |
vrabec | 0:58ee8a917618 | 41 | case BH1750_ONE_TIME_LOW_RES_MODE: |
vrabec | 0:58ee8a917618 | 42 | data[0] = mode; |
vrabec | 0:58ee8a917618 | 43 | status = i2c.write(BH1750_I2CADDR, data, sizeof(data), false); |
vrabec | 0:58ee8a917618 | 44 | wait_ms(10); |
vrabec | 0:58ee8a917618 | 45 | break; |
vrabec | 0:58ee8a917618 | 46 | default: |
vrabec | 0:58ee8a917618 | 47 | break; |
vrabec | 0:58ee8a917618 | 48 | } |
vrabec | 0:58ee8a917618 | 49 | } |
vrabec | 0:58ee8a917618 | 50 | |
vrabec | 0:58ee8a917618 | 51 | |
vrabec | 0:58ee8a917618 | 52 | float BH1750::readIntesity(void) |
vrabec | 0:58ee8a917618 | 53 | { |
vrabec | 0:58ee8a917618 | 54 | status = i2c.read(BH1750_I2CADDR, rawDataBuffer, 2, false); |
vrabec | 0:58ee8a917618 | 55 | if(status != 0) { |
vrabec | 0:58ee8a917618 | 56 | return -1; |
vrabec | 0:58ee8a917618 | 57 | } |
vrabec | 0:58ee8a917618 | 58 | //success |
vrabec | 0:58ee8a917618 | 59 | float result = 0; |
vrabec | 0:58ee8a917618 | 60 | result = ((rawDataBuffer[0]<<8)|rawDataBuffer[1])/1.2; |
vrabec | 0:58ee8a917618 | 61 | return result; |
vrabec | 0:58ee8a917618 | 62 | } |
vrabec | 0:58ee8a917618 | 63 | |
vrabec | 0:58ee8a917618 | 64 | int BH1750::getStatus(void) |
vrabec | 0:58ee8a917618 | 65 | { |
vrabec | 0:58ee8a917618 | 66 | return status; |
vrabec | 0:58ee8a917618 | 67 | } |
vrabec | 0:58ee8a917618 | 68 | |
vrabec | 0:58ee8a917618 | 69 | char* BH1750::getRawData(void) |
vrabec | 0:58ee8a917618 | 70 | { |
vrabec | 0:58ee8a917618 | 71 | return rawDataBuffer; |
vrabec | 0:58ee8a917618 | 72 | } |