test
Dependents: gather_sensor_data
BH1750.cpp@0:be50fe376e4f, 2016-09-08 (annotated)
- Committer:
- readysteadygo2006
- Date:
- Thu Sep 08 14:05:53 2016 +0000
- Revision:
- 0:be50fe376e4f
test
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
readysteadygo2006 | 0:be50fe376e4f | 1 | /* |
readysteadygo2006 | 0:be50fe376e4f | 2 | |
readysteadygo2006 | 0:be50fe376e4f | 3 | This is a library for the BH1750FVI (GY-30) Digital Light Sensor |
readysteadygo2006 | 0:be50fe376e4f | 4 | breakout board. |
readysteadygo2006 | 0:be50fe376e4f | 5 | |
readysteadygo2006 | 0:be50fe376e4f | 6 | The board uses I2C for communication. 2 pins are required to |
readysteadygo2006 | 0:be50fe376e4f | 7 | interface to the device and in most cases also pull up resistors. |
readysteadygo2006 | 0:be50fe376e4f | 8 | |
readysteadygo2006 | 0:be50fe376e4f | 9 | Datasheet: |
readysteadygo2006 | 0:be50fe376e4f | 10 | http://rohmfs.rohm.com/en/products/databook/datasheet/ic/sensor/light/bh1750fvi-e.pdf |
readysteadygo2006 | 0:be50fe376e4f | 11 | |
readysteadygo2006 | 0:be50fe376e4f | 12 | Inspired by Christopher Laws, March, 2013. |
readysteadygo2006 | 0:be50fe376e4f | 13 | Written by Michal Stehlik, August, 2014. |
readysteadygo2006 | 0:be50fe376e4f | 14 | |
readysteadygo2006 | 0:be50fe376e4f | 15 | */ |
readysteadygo2006 | 0:be50fe376e4f | 16 | |
readysteadygo2006 | 0:be50fe376e4f | 17 | #include "BH1750.h" |
readysteadygo2006 | 0:be50fe376e4f | 18 | |
readysteadygo2006 | 0:be50fe376e4f | 19 | BH1750::BH1750(PinName sda, PinName scl) : i2c(sda,scl) |
readysteadygo2006 | 0:be50fe376e4f | 20 | { |
readysteadygo2006 | 0:be50fe376e4f | 21 | rawDataBuffer[0] = 0; |
readysteadygo2006 | 0:be50fe376e4f | 22 | rawDataBuffer[1] = 0; |
readysteadygo2006 | 0:be50fe376e4f | 23 | status = -1; |
readysteadygo2006 | 0:be50fe376e4f | 24 | } |
readysteadygo2006 | 0:be50fe376e4f | 25 | |
readysteadygo2006 | 0:be50fe376e4f | 26 | void BH1750::init(char mode) |
readysteadygo2006 | 0:be50fe376e4f | 27 | { |
readysteadygo2006 | 0:be50fe376e4f | 28 | configure(mode); |
readysteadygo2006 | 0:be50fe376e4f | 29 | } |
readysteadygo2006 | 0:be50fe376e4f | 30 | |
readysteadygo2006 | 0:be50fe376e4f | 31 | |
readysteadygo2006 | 0:be50fe376e4f | 32 | void BH1750::configure(char mode) |
readysteadygo2006 | 0:be50fe376e4f | 33 | { |
readysteadygo2006 | 0:be50fe376e4f | 34 | char data[1]; |
readysteadygo2006 | 0:be50fe376e4f | 35 | switch (mode) { |
readysteadygo2006 | 0:be50fe376e4f | 36 | case BH1750_CONTINUOUS_HIGH_RES_MODE: |
readysteadygo2006 | 0:be50fe376e4f | 37 | case BH1750_CONTINUOUS_HIGH_RES_MODE_2: |
readysteadygo2006 | 0:be50fe376e4f | 38 | case BH1750_CONTINUOUS_LOW_RES_MODE: |
readysteadygo2006 | 0:be50fe376e4f | 39 | case BH1750_ONE_TIME_HIGH_RES_MODE: |
readysteadygo2006 | 0:be50fe376e4f | 40 | case BH1750_ONE_TIME_HIGH_RES_MODE_2: |
readysteadygo2006 | 0:be50fe376e4f | 41 | case BH1750_ONE_TIME_LOW_RES_MODE: |
readysteadygo2006 | 0:be50fe376e4f | 42 | data[0] = mode; |
readysteadygo2006 | 0:be50fe376e4f | 43 | status = i2c.write(BH1750_I2CADDR, data, sizeof(data), false); |
readysteadygo2006 | 0:be50fe376e4f | 44 | wait_ms(10); |
readysteadygo2006 | 0:be50fe376e4f | 45 | break; |
readysteadygo2006 | 0:be50fe376e4f | 46 | default: |
readysteadygo2006 | 0:be50fe376e4f | 47 | break; |
readysteadygo2006 | 0:be50fe376e4f | 48 | } |
readysteadygo2006 | 0:be50fe376e4f | 49 | } |
readysteadygo2006 | 0:be50fe376e4f | 50 | |
readysteadygo2006 | 0:be50fe376e4f | 51 | |
readysteadygo2006 | 0:be50fe376e4f | 52 | float BH1750::readIntensity(void) |
readysteadygo2006 | 0:be50fe376e4f | 53 | { |
readysteadygo2006 | 0:be50fe376e4f | 54 | status = i2c.read(BH1750_I2CADDR, rawDataBuffer, 2, false); |
readysteadygo2006 | 0:be50fe376e4f | 55 | if(status != 0) { |
readysteadygo2006 | 0:be50fe376e4f | 56 | return -1; |
readysteadygo2006 | 0:be50fe376e4f | 57 | } |
readysteadygo2006 | 0:be50fe376e4f | 58 | //success |
readysteadygo2006 | 0:be50fe376e4f | 59 | float result = 0; |
readysteadygo2006 | 0:be50fe376e4f | 60 | result = ((rawDataBuffer[0]<<8)|rawDataBuffer[1])/1.2; |
readysteadygo2006 | 0:be50fe376e4f | 61 | return result; |
readysteadygo2006 | 0:be50fe376e4f | 62 | } |
readysteadygo2006 | 0:be50fe376e4f | 63 | |
readysteadygo2006 | 0:be50fe376e4f | 64 | int BH1750::getStatus(void) |
readysteadygo2006 | 0:be50fe376e4f | 65 | { |
readysteadygo2006 | 0:be50fe376e4f | 66 | return status; |
readysteadygo2006 | 0:be50fe376e4f | 67 | } |
readysteadygo2006 | 0:be50fe376e4f | 68 | |
readysteadygo2006 | 0:be50fe376e4f | 69 | char* BH1750::getRawData(void) |
readysteadygo2006 | 0:be50fe376e4f | 70 | { |
readysteadygo2006 | 0:be50fe376e4f | 71 | return rawDataBuffer; |
readysteadygo2006 | 0:be50fe376e4f | 72 | } |