mirror of
https://github.com/RobTillaart/Arduino.git
synced 2024-10-03 18:09:02 -04:00
215 lines
6.5 KiB
Markdown
215 lines
6.5 KiB
Markdown
|
|
[](https://github.com/marketplace/actions/arduino_ci)
|
|
[](https://github.com/RobTillaart/Max44007/actions/workflows/arduino-lint.yml)
|
|
[](https://github.com/RobTillaart/Max44007/actions/workflows/jsoncheck.yml)
|
|
[](https://github.com/RobTillaart/Max44007/issues)
|
|
|
|
[](https://github.com/RobTillaart/Max44007/blob/master/LICENSE)
|
|
[](https://github.com/RobTillaart/Max44007/releases)
|
|
[](https://registry.platformio.org/libraries/robtillaart/Max44007)
|
|
|
|
|
|
# Max44007 I2C LUX sensor
|
|
|
|
Library for Max44007 I2C lux sensor.
|
|
|
|
|
|
## Description
|
|
|
|
The Max44007 ambient light sensor is an I2C sensor, that has a 22 bit
|
|
dynamic range from 0.025 lux to 104,448 lux.
|
|
|
|
This library is experimental and created by changing some key values in the
|
|
very similar MAX44009 library. As there was no hardware available the library
|
|
is not tested yet. If you do, please share the results (open an issue on GitHub).
|
|
|
|
Note: version 0.2.0 simplified the constructor interface and removed **configure()**.
|
|
|
|
|
|
#### Related
|
|
|
|
- https://github.com/RobTillaart/Max44007 (range 0.025 lux to 104,448 lux)
|
|
- https://github.com/RobTillaart/Max44009 (range 0.045 lux to 188,000 lux)
|
|
|
|
|
|
## Schema breakout Max44007
|
|
|
|
|
|
```cpp
|
|
// breakout Max44007
|
|
//
|
|
// +--------+
|
|
// VCC |o |
|
|
// GND |o |
|
|
// SCL |o o| ADDRESS
|
|
// SDA |o o| -INT
|
|
// +--------+
|
|
//
|
|
// ADDRESS:
|
|
// 0 = 0x5A
|
|
// 1 = 0x5B
|
|
//
|
|
// INT:
|
|
// Connect the INT pin to an pull up resistor
|
|
// 0 = interrupt
|
|
// 1 = no interrupt
|
|
// connect to an LED or an interrupt pin of an Arduino
|
|
//
|
|
```
|
|
|
|
|
|
## Interface
|
|
|
|
```cpp
|
|
#include "Max44007.h"
|
|
```
|
|
|
|
### Constructor
|
|
|
|
- **Max44007(const uint8_t address = MAX44007_DEFAULT_ADDRESS, TwoWire \*wire = &Wire)** Constructor.
|
|
Optional address and optional I2C interface.\
|
|
- **bool isConnected()** returns true if the device address configured is available on I2C bus.
|
|
|
|
NOTE: The user must call **Wire.begin()** or **Wire.begin(SDA, SCL)** in **setup()**.
|
|
|
|
|
|
### Basic
|
|
|
|
- **float getLux()** read the sensor and return the value in LUX. If the value is negative, an error has occurred.
|
|
- **int getError()** returns last error.
|
|
|
|
```cpp
|
|
// ERROR CODES
|
|
#define Max44007_OK 0
|
|
#define Max44007_ERROR_WIRE_REQUEST -10
|
|
#define Max44007_ERROR_OVERFLOW -20
|
|
#define Max44007_ERROR_HIGH_BYTE -30
|
|
#define Max44007_ERROR_LOW_BYTE -31
|
|
```
|
|
|
|
|
|
### Configure thresholds
|
|
|
|
check datasheet for details
|
|
|
|
- **bool setHighThreshold(float value)** sets the upper threshold for the interrupt
|
|
generation (INT pulls LOW). Works only if INTE bit is set by **enableInterrupt()**.
|
|
Function returns false if the value is out of range.
|
|
- **float getHighThreshold()** returns the value set.
|
|
- **bool setLowThreshold(float value)** sets the lower threshold for the interrupt
|
|
generation (INT pulls LOW). Works only if INTE bit is set by **enableInterrupt()**.
|
|
Function returns false if the value is out of range.
|
|
- **float getLowThreshold()** returns the value set.
|
|
- **void setThresholdTimer(uint8_t value)** Time the threshold needs to be exceeded,
|
|
defined in steps of 100ms. 2 seems to be a practical minimum.
|
|
- **uint8_t getThresholdTimer()** returns the value set.
|
|
|
|
|
|
### Configure interrupts
|
|
|
|
check datasheet for details
|
|
|
|
- **void enableInterrupt()** enables the upper and lower threshold interrupts.
|
|
- **void disableInterrupt()** disables the threshold interrupts.
|
|
- **bool interruptEnabled()** returns 1 if the interrupt mode is enabled.
|
|
- **uint8_t getInterruptStatus()** returns 1 if an interrupt has occurred.
|
|
|
|
|
|
### Configure flags
|
|
|
|
check datasheet for details
|
|
|
|
- **void setConfiguration(uint8_t)** writes directly to configuration register.
|
|
**warning** Use with care.
|
|
- **uint8_t getConfiguration()** reads the current configuration register.
|
|
|
|
|
|
### Configure sample mode
|
|
|
|
Check datasheet for details
|
|
|
|
CCR = Current Divisor Ratio.
|
|
|
|
TIM = Integration time.
|
|
|
|
- **void setAutomaticMode()** in automatic mode the Max44007 determines the CDR and TIM
|
|
parameters.
|
|
- **void setContinuousMode()** continuous mode uses more power than a "single" conversion.
|
|
Advantage is that the latest data is always available fast.
|
|
- **void clrContinuousMode()** uses less power so better for LOW power configurations.
|
|
- **void setManualMode(uint8_t CDR, uint8_t TIM)** Set the Current Divisor Ratio and the
|
|
integration time manually. Effectively disable automatic mode.
|
|
- **int getIntegrationTime()** returns the set integration time in milliseconds
|
|
|
|
```
|
|
CDR = Current Divisor Ratio
|
|
CDR = 1 ==> only 1/8th is measured
|
|
|
|
TIM = Time Integration Measurement (table)
|
|
000 800ms
|
|
001 400ms
|
|
010 200ms
|
|
011 100ms
|
|
100 50ms manual only
|
|
101 25ms manual only
|
|
110 12.5ms manual only
|
|
111 6.25ms manual only
|
|
```
|
|
|
|
|
|
### Test functions
|
|
|
|
Function for the conversion math, not meant to be used directly,
|
|
but by making them public they become testable.
|
|
|
|
- **float convertToLux(uint8_t dataHigh, uint8_t dataLow)** convert intern register
|
|
format to a LUX value.
|
|
|
|
|
|
## Examples
|
|
|
|
**Max44007\examples\Max44007_test01**
|
|
- use for e.g. UNO (use voltage convertor!)
|
|
|
|
**Max44007\examples\Max44007_test02**
|
|
- will **not** compile for UNO
|
|
- use for e.g. ESP32
|
|
|
|
|
|
## Notes
|
|
|
|
Please be aware this is a **3.3 Volt device** so it should not be connected
|
|
to an Arduino UNO or other 5 Volt device directly.
|
|
Use a level convertor to solve this.
|
|
|
|
Do not forget to connect the address pin as you cannot read the sensor
|
|
in a reliable way. As the line will float it will sometimes have the
|
|
right address and sometimes not. (been there ;)
|
|
|
|
Pull ups on I2C bus are recommended.
|
|
|
|
|
|
## Future
|
|
|
|
#### Must
|
|
|
|
- follow MAX44009
|
|
|
|
#### Should
|
|
|
|
#### Could
|
|
|
|
- merge MAX44007 / MAX44009 library in the future. (shared base class?)
|
|
|
|
#### Wont
|
|
|
|
|
|
## Support
|
|
|
|
If you appreciate my libraries, you can support the development and maintenance.
|
|
Improve the quality of the libraries by providing issues and Pull Requests, or
|
|
donate through PayPal or GitHub sponsors.
|
|
|
|
Thank you,
|
|
|