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Chris Laws committed 2021-01-17 19:35:07 +10:30
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.clang-format
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Language: Cpp
IndentPPDirectives: AfterHash
PointerAlignment: Left
.github/workflows/ci.yml
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name: checks
on: [push, pull_request]
jobs:
lint:
runs-on: ubuntu-latest
steps:
- name: Checkout Repo
uses: actions/checkout@v2
- name: Check Lint
uses: arduino/arduino-lint-action@v1.0.0
with:
library-manager: update
compliance: strict
- name: Check Code Format
run: |
sudo apt install clang-format
clang-format --version
bash ./ci/code-format.bash
compile:
runs-on: ubuntu-latest
strategy:
matrix:
arduino-platform: ["arduino:avr", "esp8266:esp8266", "esp32:esp32"]
# In addition to the platform we also need to define the FQBN of the
# boards we want to test for each platform.
include:
- arduino-platform: "arduino:avr"
fqbn: "arduino:avr:uno"
additional-urls-arg: ""
- arduino-platform: "esp8266:esp8266"
fqbn: "esp8266:esp8266:generic"
additional-urls-arg: "--additional-urls http://arduino.esp8266.com/stable/package_esp8266com_index.json"
- arduino-platform: "esp32:esp32"
fqbn: "esp32:esp32:esp32"
additional-urls-arg: "--additional-urls https://dl.espressif.com/dl/package_esp32_index.json"
steps:
- name: Checkout Repo
uses: actions/checkout@master
- name: Setup Arduino CLI
uses: arduino/setup-arduino-cli@v1.1.1
- name: Setup Python for esptool used during ESP32 compile
uses: actions/setup-python@v2
if: ${{ matrix.arduino-platform == 'esp32:esp32' }}
with:
python-version: '3.9'
- name: Install Python Dependencies
if: ${{ matrix.arduino-platform == 'esp32:esp32' }}
run: |
python -m pip install --upgrade pip
pip install esptool
- name: Install Repo as Library
run: |
mkdir -p "$HOME/Arduino/libraries"
ln -s "$PWD" "$HOME/Arduino/libraries/."
- name: Install Arduino core and platform
run: |
arduino-cli core update-index ${{ matrix.additional-urls-arg }}
arduino-cli core install ${{ matrix.arduino-platform }} ${{ matrix.additional-urls-arg }}
- name: Compile Platform Common Sketches
run: |
arduino-cli compile --fqbn ${{ matrix.fqbn }} ./examples/BH1750test/BH1750test.ino
arduino-cli compile --fqbn ${{ matrix.fqbn }} ./examples/BH1750advanced/BH1750advanced.ino
arduino-cli compile --fqbn ${{ matrix.fqbn }} ./examples/BH1750onetime/BH1750onetime.ino
arduino-cli compile --fqbn ${{ matrix.fqbn }} ./examples/BH1750autoadjust/BH1750autoadjust.ino
- name: Compile ESP32 Platform Specific Sketches
if: ${{ matrix.arduino-platform == 'esp32:esp32' }}
run: |
arduino-cli compile --fqbn ${{ matrix.fqbn }} ./examples/BH1750two_i2c/BH1750two_i2c.ino
.travis.yml
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language: cpp
env:
global:
- ARDUINO_PACKAGE_VERSION=1.8.5
- DISPLAY=:1.0
before_install:
# arduino requires an X server even with command line
- /sbin/start-stop-daemon --start --quiet --pidfile /tmp/xvfb_$TRAVIS_JOB_NUMBER.pid --make-pidfile --background --exec /usr/bin/Xvfb -- :1 -ac -screen 0 1280x1024x16
install:
- wget -q -O- http://downloads.arduino.cc/arduino-$ARDUINO_PACKAGE_VERSION-linux64.tar.xz | tar -Jxf -
- sudo mv arduino-$ARDUINO_PACKAGE_VERSION /usr/local/share/arduino
- sudo ln -s /usr/local/share/arduino/arduino /usr/local/bin/arduino
# Add esp8266 board support
# - arduino --pref "boardsmanager.additional.urls=http://arduino.esp8266.com/stable/package_esp8266com_index.json" --save-prefs
# - arduino --install-boards esp8266:esp8266
- arduino --pref "compiler.warning_level=all" --save-prefs
# link project directory into Arduino libraries area.
- ln -s $PWD /usr/local/share/arduino/libraries/BH1750
script:
# uno
- arduino --verify --board arduino:avr:uno $PWD/examples/BH1750test/BH1750test.ino
- arduino --verify --board arduino:avr:uno $PWD/examples/BH1750advanced/BH1750advanced.ino
- arduino --verify --board arduino:avr:uno $PWD/examples/BH1750onetime/BH1750onetime.ino
- arduino --verify --board arduino:avr:uno $PWD/examples/BH1750autoadjust/BH1750autoadjust.ino
# esp8266
# - arduino --verify --board esp8266:esp8266:generic $PWD/examples/BH1570test/BH1750test.ino
# - arduino --verify --board esp8266:esp8266:generic $PWD/examples/BH1570advanced/BH1750advanced.ino
# - arduino --verify --board esp8266:esp8266:generic $PWD/examples/BH1750onetime/BH1750onetime.ino
# - arduino --verify --board esp8266:esp8266:generic $PWD/examples/BH1750autoadjust/BH1750autoadjust.ino
README.md
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@@ -1,6 +1,6 @@
# BH1750
[![Build Status](https://travis-ci.org/claws/BH1750.svg?branch=master)](https://travis-ci.org/claws/BH1750)<br>
[![Build Status](https://github.com/claws/BH1750/workflows/checks/badge.svg?branch=master)](https://github.com/claws/BH1750/actions)<br>
This package contains an Arduino library for digital light sensor breakout boards containing the
BH1750FVI IC.
@@ -44,14 +44,14 @@ Usually you will get an integer value which represent the lux equivalent.
- High Resolution Mode - (generic range: 0.0 up to 54612.5 lux)
- High Resolution Mode 2 - (generic range: 0.0 up to 27306.25 lux)
The sensor itself returns a 16 bit unsigned integer. Therefore the maximum value is limited in general.
The sensor itself returns a 16 bit unsigned integer. Therefore the maximum value is limited in general.
The standard conversion between the so called 'counts' to lux is 1/1.2, that means you get a smaller value.
As we use float, if an error occurs you will get a negative value.
- -1 no valid data was transmitted from the sensor
- -2 device is not configured
Otherwise the measured counts are converted to lux and returned. If no advanced parameters are changed the maximum lux value is 54612.5 lx.
As the sensor counts impact of light in a specific time frame you could change this time frame.
Otherwise the measured counts are converted to lux and returned. If no advanced parameters are changed the maximum lux value is 54612.5 lx.
As the sensor counts impact of light in a specific time frame you could change this time frame.
This is needed if you use an overlay window or compensate for environmental influence like darkness.
This time frame is defined by a register which is called MTreg. Therefore you could choose a value between 32 and 254.
The default value is 69; keep in mind that the measurement time is changed accordingly.
@@ -62,19 +62,19 @@ The datasheet for the BH1750 chip can be obtained
## Installation [![arduino-library-badge](https://www.ardu-badge.com/badge/BH1750.svg?)](https://www.ardu-badge.com/BH1750)
- **(For Arduino >= 1.5.x)** Install this package by searching for it in the
- **(For Arduino >= 1.5.x)** Install this package by searching for it in the
Arduino Library Manager and then clicking ``install``. Alternatively, this
library can be installed manually by clicking "Clone or download" -> "Download ZIP"
button. Then open Arduino IDE, click `Sketch -> Include library -> Add .ZIP library`
library can be installed manually by clicking "Clone or download" -> "Download ZIP"
button. Then open Arduino IDE, click `Sketch -> Include library -> Add .ZIP library`
and select the downloaded archive.
- **(For Arduino < 1.5.x)** Download this package as an archive by clicking
"Clone or download" -> "Download ZIP" button. Then extract the archive to
``<Your User Directory>/My Documents/Arduino/libraries/`` folder and rename
- **(For Arduino < 1.5.x)** Download this package as an archive by clicking
"Clone or download" -> "Download ZIP" button. Then extract the archive to
``<Your User Directory>/My Documents/Arduino/libraries/`` folder and rename
it to `BH1750`. Restart IDE.
The following YouTube [video](https://youtu.be/ACTMQvPVMLs) (specifically from
7:20 onwards) provides a good overview of manually installing this library and
7:20 onwards) provides a good overview of manually installing this library and
loading an example using the Arduino IDE.
[![BH1750 Video Tutorial](https://img.youtube.com/vi/ACTMQvPVMLs/0.jpg)](https://youtu.be/ACTMQvPVMLs?t=437)
@@ -159,7 +159,69 @@ Light: 335.0 lx
Light: 332.0 lx
```
## More Examples
### More Examples
The ``examples`` directory contains more advanced use cases such as using different modes, I2C addresses and multiple Wire instances.
## Developers
The following information is for developers of this library.
### Code Format
The code in this project is formatted using ``clang-format`` tool.
Good instructions for installing ``clang-format`` can be found
[here](https://learn.adafruit.com/the-well-automated-arduino-library/formatting-with-clang-format)
Once the ``clang-format`` tool has been install you can then run the
convenience script (``ci/code-format.bash``) to check or apply the code
formatting. The script should be run from the repo's top level directory.
```shell
$ ./ci/code-format.bash
```
This script is also run as part of the project's continuous integration
checks.
If you make changes to code files then the code format can be applied
by simply passing *apply* as an argument to the script.
```shell
$ ./ci/code-format.bash apply
```
### Code Linting
The code in this project is linted using ``arduino-lint``. The tool can be
installed using the instructions [here](https://arduino.github.io/arduino-lint/latest/installation/).
To run the linter over the project use the command below.
```shell
$ arduino-lint --library-manager update --compliance strict
```
The same command is run as part of the project's continuous integration
checks.
If errors or warnings are reported then fix them and re-run the script
until they are resolved.
### Build Locally
The code in this project can be built locally using the ``arduino-cli`` tool.
The tool can be installed using the instructions [here](https://github.com/arduino/arduino-cli#quickstart). Once you have the tool installed you can compile the
examples scripts using the convenience script (``ci/compile-examples.bash``).
```shell
$ ./ci/compile-examples.bash
```
This script performs the same actions as the project's continuous integration
compile checks.
### Release Process
- Update ``library.json`` and ``library.properties`` version strings.
- Create a new project release and use the new version number as tag. Click Publish.
- Now wait about an hour for it to appear in the Arduino library manager.
build-examples.bash
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@@ -1,36 +0,0 @@
#!/usr/bin/env bash
#
# A simple script to automate building BH1750 examples.
#
# Example (MacOSX):
# $ ARDUINO_IDE_PATH=/Applications/Arduino.app/Contents/Java ./build-examples.bash
#
# Path to script directory.
SCRIPTPATH="$( cd "$(dirname "$0")" ; pwd -P )"
LIBNAME="$(basename "$SCRIPTPATH")"
if [[ -z "${ARDUINO_IDE_PATH}" ]]; then
echo "ARDUINO_IDE_PATH env var is not set"
exit 1
fi
# Link BH1750 library into Arduino libraries directory
ln -s $SCRIPTPATH $ARDUINO_IDE_PATH/libraries/
cd $ARDUINO_IDE_PATH
for sketch in `find $SCRIPTPATH/examples -name '*.ino'`
do
echo "Compiling $sketch"
./arduino-builder -hardware ./hardware -tools ./hardware/tools/avr -tools ./tools-builder -libraries ./libraries -fqbn arduino:avr:uno --prefs "compiler.warning_level=all" $sketch
# ./arduino-builder -hardware ./hardware -tools ./hardware/tools/avr -tools ./tools-builder -libraries ./libraries -fqbn esp8266:esp8266:generic --prefs "compiler.warning_level=all" $sketch
if [ $? -ne 0 ]; then
echo -e "\xe2\x9c\x96" # check icon
else
echo -e "\xe2\x9c\x93" # tick icon
fi
done
# Unlink BH1750 library from Arduino libraries directory
unlink $ARDUINO_IDE_PATH/libraries/$LIBNAME
ci/code-format.bash
Executable
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@@ -0,0 +1,42 @@
#!/bin/bash
# Exit immediately if a command exits with a non-zero status.
# set -e
# Define colors
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
NORMAL='\033[0m'
apply=0
action="Checking"
if [ $# -eq 1 ]; then
if [ "$1" == "apply" ]; then
apply=1
action="Applying"
else
echo "'apply' is the only argument supported"
exit 1
fi
fi
files=$(find . -type f -name "*.c" -or -name "*.cpp" -or -name "*.h" -or -name "*.hpp" -or -name "*.ino")
# Check clang-format output
for f in $files ; do
if [ -f "$f" ]; then
echo "${action} code format for ${f}"
if [ $apply -eq 1 ]; then
clang-format -i $f
else
diff $f <(clang-format --assume-filename=main.cpp $f) --minimal
fi
if [ $? -ne 0 ]; then
echo -e "${RED}\xe2\x9c\x96${NORMAL}"; # Cross
exit 1
else
echo -e "${GREEN}\xe2\x9c\x93${NORMAL}"; # Tick
fi
fi
done
ci/compile-examples.bash
Executable
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@@ -0,0 +1,30 @@
#!/bin/bash
#
# A convenience script to automate building BH1750 examples.
#
# AVR
echo "Compiling examples using FQBN arduino:avr:uno"
arduino-cli compile --fqbn arduino:avr:uno ./examples/BH1750test/BH1750test.ino
arduino-cli compile --fqbn arduino:avr:uno ./examples/BH1750advanced/BH1750advanced.ino
arduino-cli compile --fqbn arduino:avr:uno ./examples/BH1750onetime/BH1750onetime.ino
arduino-cli compile --fqbn arduino:avr:uno ./examples/BH1750autoadjust/BH1750autoadjust.ino
# ESP8266
echo "Compiling examples using FQBN esp8266:esp8266:generic"
arduino-cli core update-index --additional-urls http://arduino.esp8266.com/stable/package_esp8266com_index.json
arduino-cli core install esp8266:esp8266 --additional-urls http://arduino.esp8266.com/stable/package_esp8266com_index.json
arduino-cli compile --fqbn esp8266:esp8266:generic ./examples/BH1750test/BH1750test.ino
arduino-cli compile --fqbn esp8266:esp8266:generic ./examples/BH1750advanced/BH1750advanced.ino
arduino-cli compile --fqbn esp8266:esp8266:generic ./examples/BH1750onetime/BH1750onetime.ino
arduino-cli compile --fqbn esp8266:esp8266:generic ./examples/BH1750autoadjust/BH1750autoadjust.ino
# ESP32
echo "Compiling examples using FQBN esp32:esp32:esp32"
arduino-cli core update-index --additional-urls https://dl.espressif.com/dl/package_esp32_index.json
arduino-cli core install esp32:esp32 --additional-urls https://dl.espressif.com/dl/package_esp32_index.json
arduino-cli compile --fqbn esp32:esp32:esp32 ./examples/BH1750test/BH1750test.ino
arduino-cli compile --fqbn esp32:esp32:esp32 ./examples/BH1750advanced/BH1750advanced.ino
arduino-cli compile --fqbn esp32:esp32:esp32 ./examples/BH1750onetime/BH1750onetime.ino
arduino-cli compile --fqbn esp32:esp32:esp32 ./examples/BH1750autoadjust/BH1750autoadjust.ino
arduino-cli compile --fqbn esp32:esp32:esp32 ./examples/BH1750two_i2c/BH1750two_i2c.ino
examples/BH1750advanced/BH1750advanced.ino
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@@ -1,26 +1,28 @@
/*
Advanced BH1750 library usage example
Advanced BH1750 library usage example
This example has some comments about advanced usage features.
This example has some comments about advanced usage features.
Connection:
Connections
VCC -> 3V3 or 5V
GND -> GND
SCL -> SCL (A5 on Arduino Uno, Leonardo, etc or 21 on Mega and Due, on esp8266 free selectable)
SDA -> SDA (A4 on Arduino Uno, Leonardo, etc or 20 on Mega and Due, on esp8266 free selectable)
ADD -> (not connected) or GND
- VCC to 3V3 or 5V
- GND to GND
- SCL to SCL (A5 on Arduino Uno, Leonardo, etc or 21 on Mega and Due, on
esp8266 free selectable)
- SDA to SDA (A4 on Arduino Uno, Leonardo, etc or 20 on Mega and Due, on
esp8266 free selectable)
- ADD to (not connected) or GND
ADD pin is used to set sensor I2C address. If it has voltage greater or equal to
0.7VCC voltage (e.g. you've connected it to VCC) the sensor address will be
0x5C. In other case (if ADD voltage less than 0.7 * VCC) the sensor address will
be 0x23 (by default).
ADD pin is used to set sensor I2C address. If it has voltage greater or equal
to 0.7VCC voltage (e.g. you've connected it to VCC) the sensor address will be
0x5C. In other case (if ADD voltage less than 0.7 * VCC) the sensor address
will be 0x23 (by default).
*/
#include <Wire.h>
#include <BH1750.h>
#include <Wire.h>
/*
BH1750 can be physically configured to use two I2C addresses:
@@ -33,7 +35,7 @@
*/
BH1750 lightMeter(0x23);
void setup(){
void setup() {
Serial.begin(9600);
@@ -44,9 +46,9 @@ void setup(){
/*
BH1750 has six different measurement modes. They are divided in two groups;
continuous and one-time measurements. In continuous mode, sensor continuously
measures lightness value. In one-time mode the sensor makes only one
measurement and then goes into Power Down mode.
continuous and one-time measurements. In continuous mode, sensor
continuously measures lightness value. In one-time mode the sensor makes
only one measurement and then goes into Power Down mode.
Each mode, has three different precisions:
@@ -76,14 +78,11 @@ void setup(){
// begin returns a boolean that can be used to detect setup problems.
if (lightMeter.begin(BH1750::CONTINUOUS_HIGH_RES_MODE)) {
Serial.println(F("BH1750 Advanced begin"));
}
else {
} else {
Serial.println(F("Error initialising BH1750"));
}
}
void loop() {
if (lightMeter.measurementReady()) {
float lux = lightMeter.readLightLevel();
@@ -91,5 +90,4 @@ void loop() {
Serial.print(lux);
Serial.println(" lx");
}
}
examples/BH1750autoadjust/BH1750autoadjust.ino
+51 -51
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@@ -1,38 +1,40 @@
/*
Example of BH1750 library usage.
Example of BH1750 library usage.
This example initialises the BH1750 object using the default high resolution
one shot mode and then makes a light level reading every five seconds.
This example initialises the BH1750 object using the default high resolution
one shot mode and then makes a light level reading every five seconds.
After the measurement the MTreg value is changed according to the result:
lux > 40000 ==> MTreg = 32
lux < 40000 ==> MTreg = 69 (default)
lux < 10 ==> MTreg = 138
Remember to test your specific sensor! Maybe the MTreg value range from 32
up to 254 is not applicable to your unit.
After the measurement the MTreg value is changed according to the result:
lux > 40000 ==> MTreg = 32
lux < 40000 ==> MTreg = 69 (default)
lux < 10 ==> MTreg = 138
Remember to test your specific sensor! Maybe the MTreg value range from 32
up to 254 is not applicable to your unit.
Connection:
Connections
VCC -> 3V3 or 5V
GND -> GND
SCL -> SCL (A5 on Arduino Uno, Leonardo, etc or 21 on Mega and Due, on esp8266 free selectable)
SDA -> SDA (A4 on Arduino Uno, Leonardo, etc or 20 on Mega and Due, on esp8266 free selectable)
ADD -> (not connected) or GND
- VCC to 3V3 or 5V
- GND to GND
- SCL to SCL (A5 on Arduino Uno, Leonardo, etc or 21 on Mega and Due, on
esp8266 free selectable)
- SDA to SDA (A4 on Arduino Uno, Leonardo, etc or 20 on Mega and Due, on
esp8266 free selectable)
- ADD to (not connected) or GND
ADD pin is used to set sensor I2C address. If it has voltage greater or equal to
0.7VCC voltage (e.g. you've connected it to VCC) the sensor address will be
0x5C. In other case (if ADD voltage less than 0.7 * VCC) the sensor address will
be 0x23 (by default).
ADD pin is used to set sensor I2C address. If it has voltage greater or equal to
0.7VCC voltage (e.g. you've connected it to VCC) the sensor address will be
0x5C. In other case (if ADD voltage less than 0.7 * VCC) the sensor address will
be 0x23 (by default).
*/
#include <Wire.h>
#include <BH1750.h>
#include <Wire.h>
BH1750 lightMeter;
void setup(){
void setup() {
Serial.begin(9600);
@@ -41,15 +43,14 @@ void setup(){
// On esp8266 you can select SCL and SDA pins using Wire.begin(D4, D3);
lightMeter.begin(BH1750::ONE_TIME_HIGH_RES_MODE);
//lightMeter.setMTreg(69); // not needed, only mentioning it
// lightMeter.setMTreg(69); // not needed, only mentioning it
Serial.println(F("BH1750 Test begin"));
}
void loop() {
//we use here the maxWait option due fail save
if (lightMeter.measurementReady(true)) {
// we use here the maxWait option due fail save
if (lightMeter.measurementReady(true)) {
float lux = lightMeter.readLightLevel();
Serial.print(F("Light: "));
Serial.print(lux);
@@ -57,40 +58,39 @@ void loop() {
if (lux < 0) {
Serial.println(F("Error condition detected"));
}
else {
} else {
if (lux > 40000.0) {
// reduce measurement time - needed in direct sun light
if (lightMeter.setMTreg(32)) {
Serial.println(F("Setting MTReg to low value for high light environment"));
Serial.println(
F("Setting MTReg to low value for high light environment"));
} else {
Serial.println(
F("Error setting MTReg to low value for high light environment"));
}
else {
Serial.println(F("Error setting MTReg to low value for high light environment"));
}
}
else {
if (lux > 10.0) {
// typical light environment
if (lightMeter.setMTreg(69)) {
Serial.println(F("Setting MTReg to default value for normal light environment"));
}
else {
Serial.println(F("Error setting MTReg to default value for normal light environment"));
} else {
if (lux > 10.0) {
// typical light environment
if (lightMeter.setMTreg(69)) {
Serial.println(F(
"Setting MTReg to default value for normal light environment"));
} else {
Serial.println(F("Error setting MTReg to default value for normal "
"light environment"));
}
} else {
if (lux <= 10.0) {
// very low light environment
if (lightMeter.setMTreg(138)) {
Serial.println(
F("Setting MTReg to high value for low light environment"));
} else {
Serial.println(F("Error setting MTReg to high value for low "
"light environment"));
}
}
else {
if (lux <= 10.0) {
//very low light environment
if (lightMeter.setMTreg(138)) {
Serial.println(F("Setting MTReg to high value for low light environment"));
}
else {
Serial.println(F("Error setting MTReg to high value for low light environment"));
}
}
}
}
}
Serial.println(F("--------------------------------------"));
}
examples/BH1750onetime/BH1750onetime.ino
+8 -10
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@@ -1,22 +1,22 @@
/*
Example of BH1750 library usage.
Example of BH1750 library usage.
This example initialises the BH1750 object using the high resolution
one-time mode and then makes a light level reading every second.
This example initialises the BH1750 object using the high resolution
one-time mode and then makes a light level reading every second.
The BH1750 component starts up in default mode when it next powers up.
The BH1750 library automatically reconfigures the one-time mode in
preparation for the next measurement.
The BH1750 component starts up in default mode when it next powers up.
The BH1750 library automatically reconfigures the one-time mode in
preparation for the next measurement.
*/
#include <Wire.h>
#include <BH1750.h>
#include <Wire.h>
BH1750 lightMeter;
void setup(){
void setup() {
Serial.begin(9600);
@@ -27,10 +27,8 @@ void setup(){
lightMeter.begin(BH1750::ONE_TIME_HIGH_RES_MODE);
Serial.println(F("BH1750 One-Time Test"));
}
void loop() {
while (!lightMeter.measurementReady(true)) {
examples/BH1750test/BH1750test.ino
+19 -23
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@@ -1,54 +1,50 @@
/*
Example of BH1750 library usage.
Example of BH1750 library usage.
This example initialises the BH1750 object using the default high resolution
continuous mode and then makes a light level reading every second.
This example initialises the BH1750 object using the default high resolution
continuous mode and then makes a light level reading every second.
Connection:
Connections
VCC -> 3V3 or 5V
GND -> GND
SCL -> SCL (A5 on Arduino Uno, Leonardo, etc or 21 on Mega and Due, on esp8266 free selectable)
SDA -> SDA (A4 on Arduino Uno, Leonardo, etc or 20 on Mega and Due, on esp8266 free selectable)
ADD -> (not connected) or GND
- VCC to 3V3 or 5V
- GND to GND
- SCL to SCL (A5 on Arduino Uno, Leonardo, etc or 21 on Mega and Due, on
esp8266 free selectable)
- SDA to SDA (A4 on Arduino Uno, Leonardo, etc or 20 on Mega and Due, on
esp8266 free selectable)
- ADD to (not connected) or GND
ADD pin is used to set sensor I2C address. If it has voltage greater or equal to
0.7VCC voltage (e.g. you've connected it to VCC) the sensor address will be
0x5C. In other case (if ADD voltage less than 0.7 * VCC) the sensor address will
be 0x23 (by default).
ADD pin is used to set sensor I2C address. If it has voltage greater or equal
to 0.7VCC voltage (e.g. you've connected it to VCC) the sensor address will be
0x5C. In other case (if ADD voltage less than 0.7 * VCC) the sensor address
will be 0x23 (by default).
*/
#include <Wire.h>
#include <BH1750.h>
#include <Wire.h>
BH1750 lightMeter;
void setup(){
void setup() {
Serial.begin(9600);
// Initialize the I2C bus (BH1750 library doesn't do this automatically)
Wire.begin();
// On esp8266 you can select SCL and SDA pins using Wire.begin(D4, D3);
// For Wemos / Lolin D1 Mini Pro and the Ambient Light shield use Wire.begin(D2, D1);
// For Wemos / Lolin D1 Mini Pro and the Ambient Light shield use
// Wire.begin(D2, D1);
lightMeter.begin();
Serial.println(F("BH1750 Test begin"));
}
void loop() {
float lux = lightMeter.readLightLevel();
Serial.print("Light: ");
Serial.print(lux);
Serial.println(" lx");
delay(1000);
}
examples/BH1750two_i2c/BH1750two_i2c.ino
+28 -24
View File
@@ -1,31 +1,31 @@
/*
Example of BH1750 library usage.
Example of BH1750 library usage.
This example initialises two BH1750 objects using different TwoWire
instances (Wire and Wire1) and then makes a light level reading every second.
This is the case for boards such as the ESP8266 and ESP32
This example initialises two BH1750 objects using different TwoWire
instances (Wire and Wire1) and then makes a light level reading every second.
This is the case for boards such as the ESP8266 and ESP32
Connection:
Connections:
BH1750 A:
VCC -> 3V3 or 5V
GND -> GND
SCL -> SCL (19 in this example)
SDA -> SDA (18 in this example)
ADD -> (not connected) or GND
BH1750 A:
VCC -> 3V3 or 5V
GND -> GND
SCL -> SCL (19 in this example)
SDA -> SDA (18 in this example)
ADD -> (not connected) or GND
BH1750 B:
VCC -> 3V3 or 5V
GND -> GND
SCL -> SCL (22 in this example)
SDA -> SDA (21 in this example)
ADD -> (not connected) or GND
BH1750 B:
VCC -> 3V3 or 5V
GND -> GND
SCL -> SCL (22 in this example)
SDA -> SDA (21 in this example)
ADD -> (not connected) or GND
ADD pin is used to set sensor I2C address. If it has voltage greater or equal to
0.7VCC voltage (e.g. you've connected it to VCC) the sensor address will be
0x5C. In other case (if ADD voltage less than 0.7 * VCC) the sensor address will
be 0x23 (by default).
ADD pin is used to set sensor I2C address. If it has voltage greater or equal
to 0.7VCC voltage (e.g. you've connected it to VCC) the sensor address will be
0x5C. In other case (if ADD voltage less than 0.7 * VCC) the sensor address
will be 0x23 (by default).
*/
@@ -50,9 +50,13 @@ int error_counter_2_b = 0;
void loop() {
float light_level_a;
if (bh1750_a.measurementReady()) { light_level_a = bh1750_a.readLightLevel(); }
float light_level_b;
if (bh1750_b.measurementReady()) { light_level_b = bh1750_b.readLightLevel(); }
if (bh1750_a.measurementReady()) {
light_level_a = bh1750_a.readLightLevel();
}
float light_level_b;
if (bh1750_b.measurementReady()) {
light_level_b = bh1750_b.readLightLevel();
}
if (lround(light_level_a) == -1) {
error_counter_1_a++;
src/BH1750.cpp
+101 -106
View File
@@ -15,35 +15,32 @@
// Define milliseconds delay for ESP8266 platform
#if defined(ESP8266)
#include <pgmspace.h>
#define _delay_ms(ms) delayMicroseconds((ms) * 1000)
# include <pgmspace.h>
# define _delay_ms(ms) delayMicroseconds((ms)*1000)
// Use _delay_ms from utils for AVR-based platforms
#elif defined(__avr__)
#include <util/delay.h>
# include <util/delay.h>
// Use Wiring's delay for compability with another platforms
#else
#define _delay_ms(ms) delay(ms)
# define _delay_ms(ms) delay(ms)
#endif
// Legacy Wire.write() function fix
#if (ARDUINO >= 100)
#define __wire_write(d) I2C->write(d)
# define __wire_write(d) I2C->write(d)
#else
#define __wire_write(d) I2C->send(d)
# define __wire_write(d) I2C->send(d)
#endif
// Legacy Wire.read() function fix
#if (ARDUINO >= 100)
#define __wire_read() I2C->read()
# define __wire_read() I2C->read()
#else
#define __wire_read() I2C->receive()
# define __wire_read() I2C->receive()
#endif
/**
* Constructor
* @params addr Sensor address (0x76 or 0x72, see datasheet)
@@ -57,21 +54,20 @@ BH1750::BH1750(byte addr) {
I2C = &Wire;
}
/**
* Configure sensor
* @param mode Measurement mode
* @param addr Address of the sensor
* @param i2c TwoWire instance connected to I2C bus
*/
bool BH1750::begin(Mode mode, byte addr, TwoWire *i2c) {
bool BH1750::begin(Mode mode, byte addr, TwoWire* i2c) {
// I2C is expected to be initialized outside this library
// But, allows a different address and TwoWire instance to be used
if(i2c) {
if (i2c) {
I2C = i2c;
}
if(addr) {
if (addr) {
BH1750_I2CADDR = addr;
}
@@ -79,7 +75,6 @@ bool BH1750::begin(Mode mode, byte addr, TwoWire *i2c) {
return (configure(mode) && setMTreg(BH1750_DEFAULT_MTREG));
}
/**
* Configure BH1750 with specified mode
* @param mode Measurement mode
@@ -92,54 +87,52 @@ bool BH1750::configure(Mode mode) {
// Check measurement mode is valid
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:
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:
// Send mode to sensor
I2C->beginTransmission(BH1750_I2CADDR);
__wire_write((uint8_t)mode);
ack = I2C->endTransmission();
// Send mode to sensor
I2C->beginTransmission(BH1750_I2CADDR);
__wire_write((uint8_t)mode);
ack = I2C->endTransmission();
// Wait a few moments to wake up
_delay_ms(10);
break;
default:
// Invalid measurement mode
Serial.println(F("[BH1750] ERROR: Invalid mode"));
break;
// Wait a few moments to wake up
_delay_ms(10);
break;
default:
// Invalid measurement mode
Serial.println(F("[BH1750] ERROR: Invalid mode"));
break;
}
// Check result code
switch (ack) {
case 0:
BH1750_MODE = mode;
lastReadTimestamp = millis();
return true;
case 1: // too long for transmit buffer
Serial.println(F("[BH1750] ERROR: too long for transmit buffer"));
break;
case 2: // received NACK on transmit of address
Serial.println(F("[BH1750] ERROR: received NACK on transmit of address"));
break;
case 3: // received NACK on transmit of data
Serial.println(F("[BH1750] ERROR: received NACK on transmit of data"));
break;
case 4: // other error
Serial.println(F("[BH1750] ERROR: other error"));
break;
default:
Serial.println(F("[BH1750] ERROR: undefined error"));
break;
case 0:
BH1750_MODE = mode;
lastReadTimestamp = millis();
return true;
case 1: // too long for transmit buffer
Serial.println(F("[BH1750] ERROR: too long for transmit buffer"));
break;
case 2: // received NACK on transmit of address
Serial.println(F("[BH1750] ERROR: received NACK on transmit of address"));
break;
case 3: // received NACK on transmit of data
Serial.println(F("[BH1750] ERROR: received NACK on transmit of data"));
break;
case 4: // other error
Serial.println(F("[BH1750] ERROR: other error"));
break;
default:
Serial.println(F("[BH1750] ERROR: undefined error"));
break;
}
return false;
}
/**
@@ -150,7 +143,7 @@ bool BH1750::configure(Mode mode) {
* false if MTreg not changed or parameter out of range
*/
bool BH1750::setMTreg(byte MTreg) {
//Bug: lowest value seems to be 32!
// Bug: lowest value seems to be 32!
if (MTreg <= 31 || MTreg > 254) {
Serial.println(F("[BH1750] ERROR: MTreg out of range"));
return false;
@@ -163,7 +156,7 @@ bool BH1750::setMTreg(byte MTreg) {
__wire_write((0b01000 << 3) | (MTreg >> 5));
ack = I2C->endTransmission();
I2C->beginTransmission(BH1750_I2CADDR);
__wire_write((0b011 << 5 ) | (MTreg & 0b11111));
__wire_write((0b011 << 5) | (MTreg & 0b11111));
ack = ack | I2C->endTransmission();
I2C->beginTransmission(BH1750_I2CADDR);
__wire_write(BH1750_MODE);
@@ -174,24 +167,24 @@ bool BH1750::setMTreg(byte MTreg) {
// Check result code
switch (ack) {
case 0:
BH1750_MTreg = MTreg;
return true;
case 1: // too long for transmit buffer
Serial.println(F("[BH1750] ERROR: too long for transmit buffer"));
break;
case 2: // received NACK on transmit of address
Serial.println(F("[BH1750] ERROR: received NACK on transmit of address"));
break;
case 3: // received NACK on transmit of data
Serial.println(F("[BH1750] ERROR: received NACK on transmit of data"));
break;
case 4: // other error
Serial.println(F("[BH1750] ERROR: other error"));
break;
default:
Serial.println(F("[BH1750] ERROR: undefined error"));
break;
case 0:
BH1750_MTreg = MTreg;
return true;
case 1: // too long for transmit buffer
Serial.println(F("[BH1750] ERROR: too long for transmit buffer"));
break;
case 2: // received NACK on transmit of address
Serial.println(F("[BH1750] ERROR: received NACK on transmit of address"));
break;
case 3: // received NACK on transmit of data
Serial.println(F("[BH1750] ERROR: received NACK on transmit of data"));
break;
case 4: // other error
Serial.println(F("[BH1750] ERROR: other error"));
break;
default:
Serial.println(F("[BH1750] ERROR: undefined error"));
break;
}
return false;
@@ -201,24 +194,26 @@ bool BH1750::setMTreg(byte MTreg) {
* Checks whether enough time has gone to read a new value
* @param maxWait a boolean if to wait for typical or maximum delay
* @return a boolean if a new measurement is possible
*
*
*/
bool BH1750::measurementReady(bool maxWait) {
unsigned long delaytime = 0;
switch (BH1750_MODE) {
case BH1750::CONTINUOUS_HIGH_RES_MODE:
case BH1750::CONTINUOUS_HIGH_RES_MODE_2:
case BH1750::ONE_TIME_HIGH_RES_MODE:
case BH1750::ONE_TIME_HIGH_RES_MODE_2:
maxWait ? delaytime = (180 * BH1750_MTreg/(byte)BH1750_DEFAULT_MTREG) : delaytime = (120 * BH1750_MTreg/(byte)BH1750_DEFAULT_MTREG);
break;
case BH1750::CONTINUOUS_LOW_RES_MODE:
case BH1750::ONE_TIME_LOW_RES_MODE:
// Send mode to sensor
maxWait ? delaytime = (24 * BH1750_MTreg/(byte)BH1750_DEFAULT_MTREG) : delaytime = (16 * BH1750_MTreg/(byte)BH1750_DEFAULT_MTREG);
break;
default:
break;
case BH1750::CONTINUOUS_HIGH_RES_MODE:
case BH1750::CONTINUOUS_HIGH_RES_MODE_2:
case BH1750::ONE_TIME_HIGH_RES_MODE:
case BH1750::ONE_TIME_HIGH_RES_MODE_2:
maxWait ? delaytime = (180 * BH1750_MTreg / (byte)BH1750_DEFAULT_MTREG)
: delaytime = (120 * BH1750_MTreg / (byte)BH1750_DEFAULT_MTREG);
break;
case BH1750::CONTINUOUS_LOW_RES_MODE:
case BH1750::ONE_TIME_LOW_RES_MODE:
// Send mode to sensor
maxWait ? delaytime = (24 * BH1750_MTreg / (byte)BH1750_DEFAULT_MTREG)
: delaytime = (16 * BH1750_MTreg / (byte)BH1750_DEFAULT_MTREG);
break;
default:
break;
}
// Wait for new measurement to be possible.
// Measurements have a maximum measurement time and a typical measurement
@@ -228,11 +223,10 @@ bool BH1750::measurementReady(bool maxWait) {
// the maximum measurement time will be used. See data sheet pages 2, 5
// and 7 for more details.
unsigned long currentTimestamp = millis();
if (currentTimestamp - lastReadTimestamp >= delaytime) {
return true;
}
else
return false;
if (currentTimestamp - lastReadTimestamp >= delaytime) {
return true;
} else
return false;
}
/**
@@ -265,33 +259,34 @@ float BH1750::readLightLevel() {
lastReadTimestamp = millis();
if (level != -1.0) {
// Print raw value if debug enabled
#ifdef BH1750_DEBUG
// Print raw value if debug enabled
#ifdef BH1750_DEBUG
Serial.print(F("[BH1750] Raw value: "));
Serial.println(level);
#endif
#endif
if (BH1750_MTreg != BH1750_DEFAULT_MTREG) {
level *= (float)((byte)BH1750_DEFAULT_MTREG/(float)BH1750_MTreg);
// Print MTreg factor if debug enabled
#ifdef BH1750_DEBUG
level *= (float)((byte)BH1750_DEFAULT_MTREG / (float)BH1750_MTreg);
// Print MTreg factor if debug enabled
#ifdef BH1750_DEBUG
Serial.print(F("[BH1750] MTreg factor: "));
Serial.println( String((float)((byte)BH1750_DEFAULT_MTREG/(float)BH1750_MTreg)) );
#endif
Serial.println(
String((float)((byte)BH1750_DEFAULT_MTREG / (float)BH1750_MTreg)));
#endif
}
if (BH1750_MODE == BH1750::ONE_TIME_HIGH_RES_MODE_2 || BH1750_MODE == BH1750::CONTINUOUS_HIGH_RES_MODE_2) {
if (BH1750_MODE == BH1750::ONE_TIME_HIGH_RES_MODE_2 ||
BH1750_MODE == BH1750::CONTINUOUS_HIGH_RES_MODE_2) {
level /= 2;
}
// Convert raw value to lux
level /= BH1750_CONV_FACTOR;
// Print converted value if debug enabled
#ifdef BH1750_DEBUG
// Print converted value if debug enabled
#ifdef BH1750_DEBUG
Serial.print(F("[BH1750] Converted float value: "));
Serial.println(level);
#endif
#endif
}
return level;
}
src/BH1750.h
+38 -39
View File
@@ -6,7 +6,8 @@
interface to the device. Configuring the I2C bus is expected to be done
in user code. The BH1750 library doesn't do this automatically.
Datasheet: http://www.elechouse.com/elechouse/images/product/Digital%20light%20Sensor/bh1750fvi-e.pdf
Datasheet:
http://www.elechouse.com/elechouse/images/product/Digital%20light%20Sensor/bh1750fvi-e.pdf
Written by Christopher Laws, March, 2013.
@@ -16,9 +17,9 @@
#define BH1750_h
#if (ARDUINO >= 100)
#include <Arduino.h>
# include <Arduino.h>
#else
#include <WProgram.h>
# include <WProgram.h>
#endif
#include "Wire.h"
@@ -40,44 +41,42 @@
class BH1750 {
public:
public:
enum Mode {
// same as Power Down
UNCONFIGURED = 0,
// Measurement at 1 lux resolution. Measurement time is approx 120ms.
CONTINUOUS_HIGH_RES_MODE = 0x10,
// Measurement at 0.5 lux resolution. Measurement time is approx 120ms.
CONTINUOUS_HIGH_RES_MODE_2 = 0x11,
// Measurement at 4 lux resolution. Measurement time is approx 16ms.
CONTINUOUS_LOW_RES_MODE = 0x13,
// Measurement at 1 lux resolution. Measurement time is approx 120ms.
ONE_TIME_HIGH_RES_MODE = 0x20,
// Measurement at 0.5 lux resolution. Measurement time is approx 120ms.
ONE_TIME_HIGH_RES_MODE_2 = 0x21,
// Measurement at 4 lux resolution. Measurement time is approx 16ms.
ONE_TIME_LOW_RES_MODE = 0x23
};
enum Mode
{
// same as Power Down
UNCONFIGURED = 0,
// Measurement at 1 lux resolution. Measurement time is approx 120ms.
CONTINUOUS_HIGH_RES_MODE = 0x10,
// Measurement at 0.5 lux resolution. Measurement time is approx 120ms.
CONTINUOUS_HIGH_RES_MODE_2 = 0x11,
// Measurement at 4 lux resolution. Measurement time is approx 16ms.
CONTINUOUS_LOW_RES_MODE = 0x13,
// Measurement at 1 lux resolution. Measurement time is approx 120ms.
ONE_TIME_HIGH_RES_MODE = 0x20,
// Measurement at 0.5 lux resolution. Measurement time is approx 120ms.
ONE_TIME_HIGH_RES_MODE_2 = 0x21,
// Measurement at 4 lux resolution. Measurement time is approx 16ms.
ONE_TIME_LOW_RES_MODE = 0x23
};
BH1750(byte addr = 0x23);
bool begin(Mode mode = CONTINUOUS_HIGH_RES_MODE, byte addr = 0x23,
TwoWire* i2c = nullptr);
bool configure(Mode mode);
bool setMTreg(byte MTreg);
bool measurementReady(bool maxWait = false);
float readLightLevel();
BH1750(byte addr = 0x23);
bool begin(Mode mode = CONTINUOUS_HIGH_RES_MODE, byte addr = 0x23,
TwoWire* i2c = nullptr);
bool configure(Mode mode);
bool setMTreg(byte MTreg);
bool measurementReady(bool maxWait = false);
float readLightLevel();
private:
byte BH1750_I2CADDR;
byte BH1750_MTreg = (byte)BH1750_DEFAULT_MTREG;
// Correction factor used to calculate lux. Typical value is 1.2 but can
// range from 0.96 to 1.44. See the data sheet (p.2, Measurement Accuracy)
// for more information.
const float BH1750_CONV_FACTOR = 1.2;
Mode BH1750_MODE = UNCONFIGURED;
TwoWire* I2C;
unsigned long lastReadTimestamp;
private:
byte BH1750_I2CADDR;
byte BH1750_MTreg = (byte)BH1750_DEFAULT_MTREG;
// Correction factor used to calculate lux. Typical value is 1.2 but can
// range from 0.96 to 1.44. See the data sheet (p.2, Measurement Accuracy)
// for more information.
const float BH1750_CONV_FACTOR = 1.2;
Mode BH1750_MODE = UNCONFIGURED;
TwoWire* I2C;
unsigned long lastReadTimestamp;
};
#endif