96 lines
2.8 KiB
Arduino
96 lines
2.8 KiB
Arduino
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/*
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Advanced BH1750 library usage example
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This example has some comments about advanced usage features.
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Connection:
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VCC -> 3V3 or 5V
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GND -> GND
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SCL -> SCL (A5 on Arduino Uno, Leonardo, etc or 21 on Mega and Due, on esp8266 free selectable)
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SDA -> SDA (A4 on Arduino Uno, Leonardo, etc or 20 on Mega and Due, on esp8266 free selectable)
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ADD -> (not connected) or GND
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ADD pin is used to set sensor I2C address. If it has voltage greater or equal to
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0.7VCC voltage (e.g. you've connected it to VCC) the sensor address will be
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0x5C. In other case (if ADD voltage less than 0.7 * VCC) the sensor address will
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be 0x23 (by default).
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*/
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#include <Wire.h>
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#include <BH1750.h>
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/*
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BH1750 can be physically configured to use two I2C addresses:
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- 0x23 (most common) (if ADD pin had < 0.7VCC voltage)
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- 0x5C (if ADD pin had > 0.7VCC voltage)
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Library uses 0x23 address as default, but you can define any other address.
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If you had troubles with default value - try to change it to 0x5C.
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*/
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BH1750 lightMeter(0x23);
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void setup(){
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Serial.begin(9600);
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// Initialize the I2C bus (BH1750 library doesn't do this automatically)
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Wire.begin();
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// On esp8266 you can select SCL and SDA pins using Wire.begin(D4, D3);
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/*
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BH1750 has six different measurement modes. They are divided in two groups;
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continuous and one-time measurements. In continuous mode, sensor continuously
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measures lightness value. In one-time mode the sensor makes only one
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measurement and then goes into Power Down mode.
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Each mode, has three different precisions:
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- Low Resolution Mode - (4 lx precision, 16ms measurement time)
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- High Resolution Mode - (1 lx precision, 120ms measurement time)
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- High Resolution Mode 2 - (0.5 lx precision, 120ms measurement time)
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By default, the library uses Continuous High Resolution Mode, but you can
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set any other mode, by passing it to BH1750.begin() or BH1750.configure()
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functions.
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[!] Remember, if you use One-Time mode, your sensor will go to Power Down
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mode each time, when it completes a measurement and you've read it.
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Full mode list:
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BH1750_CONTINUOUS_LOW_RES_MODE
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BH1750_CONTINUOUS_HIGH_RES_MODE (default)
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BH1750_CONTINUOUS_HIGH_RES_MODE_2
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BH1750_ONE_TIME_LOW_RES_MODE
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BH1750_ONE_TIME_HIGH_RES_MODE
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BH1750_ONE_TIME_HIGH_RES_MODE_2
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*/
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// begin returns a boolean that can be used to detect setup problems.
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if (lightMeter.begin(BH1750::CONTINUOUS_HIGH_RES_MODE)) {
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Serial.println(F("BH1750 Advanced begin"));
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}
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else {
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Serial.println(F("Error initialising BH1750"));
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}
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}
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void loop() {
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if (lightMeter.measurementReady()) {
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float lux = lightMeter.readLightLevel();
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Serial.print("Light: ");
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Serial.print(lux);
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Serial.println(" lx");
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}
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}
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