Bonjour,
Comme vous le voyez dans le titre, je souhaite connecter 2 capteur de luminosité (BH1750) sur une même carte arduino via le bus I2C.
Avec 1 pas de soucis via la librairie BH1750 mais lorsque que je branche le 2ème, ils ont la même valeur.
J'ai pris les adresse 0x23 et 0x5C donc ADDR relié sur +3.3V sur l'un et 0V sur l'autre.
Voici mon code :
Merci de votre aide.Code:/* Advanced BH1750 library usage example This example has some comments about advanced usage features. Connection: 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 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> /* BH1750 can be physically configured to use two I2C addresses: - 0x23 (most common) (if ADD pin had < 0.7VCC voltage) - 0x5C (if ADD pin had > 0.7VCC voltage) Library uses 0x23 address as default, but you can define any other address. If you had troubles with default value - try to change it to 0x5C. */ BH1750 lightMeter1(0x23); BH1750 lightMeter2(0x5C); 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); /* 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. Each mode, has three different precisions: - Low Resolution Mode - (4 lx precision, 16ms measurement time) - High Resolution Mode - (1 lx precision, 120ms measurement time) - High Resolution Mode 2 - (0.5 lx precision, 120ms measurement time) By default, the library uses Continuous High Resolution Mode, but you can set any other mode, by passing it to BH1750.begin() or BH1750.configure() functions. [!] Remember, if you use One-Time mode, your sensor will go to Power Down mode each time, when it completes a measurement and you've read it. Full mode list: BH1750_CONTINUOUS_LOW_RES_MODE BH1750_CONTINUOUS_HIGH_RES_MODE (default) BH1750_CONTINUOUS_HIGH_RES_MODE_2 BH1750_ONE_TIME_LOW_RES_MODE BH1750_ONE_TIME_HIGH_RES_MODE BH1750_ONE_TIME_HIGH_RES_MODE_2 */ // begin returns a boolean that can be used to detect setup problems. lightMeter1.begin(BH1750::CONTINUOUS_HIGH_RES_MODE); lightMeter2.begin(BH1750::CONTINUOUS_HIGH_RES_MODE); } void loop() { Wire.beginTransmission(0x23); float lux1 = lightMeter1.readLightLevel(); Serial.print("Light1: "); Serial.print(lux1); Serial.println(" lx"); Wire.endTransmission(); Wire.beginTransmission(0x5C); float lux2 = lightMeter2.readLightLevel(); Serial.print("Light2: "); Serial.print(lux2); Serial.println(" lx"); Wire.endTransmission(); delay(500); }
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