Frequent calls to readLightLevel prevents measurement update about bh1750

[coelner]

No, that looks like a bug.

BH1750/BH1750.cpp

Lines 220 to 224 in 0643631

	// Send mode to sensor
	Wire.beginTransmission(BH1750_I2CADDR);
	__wire_write((uint8_t)BH1750_MODE);
	Wire.endTransmission();

We should check for continuous mode and do not reconfigure the sensor.

[coelner]

Can you replace it accordingly with the following and test it?

float BH1750::readLightLevel(bool maxWait) {

  if (BH1750_MODE == UNCONFIGURED) {
    Serial.println(F("[BH1750] Device is not configured!"));
    return -2.0;
  }

  // Measurement result will be stored here
  float level = -1.0;

  // Wait for measurement to be taken.
  // Measurements have a maximum measurement time and a typical measurement
  // time. The maxWait argument determines which measurement wait time is
  // used when a one-time mode is being used. The typical (shorter)
  // measurement time is used by default and if maxWait is set to True then
  // the maximum measurement time will be used. See data sheet pages 2, 5
  // and 7 for more details.
  // A continuous mode measurement can be read immediately after re-sending
  // the mode command.

  switch (BH1750_MODE) {

    case BH1750::ONE_TIME_LOW_RES_MODE:
        // Send mode to sensor
  Wire.beginTransmission(BH1750_I2CADDR);
  __wire_write((uint8_t)BH1750_MODE);
  Wire.endTransmission();
      maxWait ? _delay_ms(24 * BH1750_MTreg/(byte)BH1750_DEFAULT_MTREG) : _delay_ms(16 * BH1750_MTreg/(byte)BH1750_DEFAULT_MTREG);
      break;
    case BH1750::ONE_TIME_HIGH_RES_MODE:
    case BH1750::ONE_TIME_HIGH_RES_MODE_2:
      // Send mode to sensor
  Wire.beginTransmission(BH1750_I2CADDR);
  __wire_write((uint8_t)BH1750_MODE);
  Wire.endTransmission();
      maxWait ? _delay_ms(180 * BH1750_MTreg/(byte)BH1750_DEFAULT_MTREG) :_delay_ms(120 * BH1750_MTreg/(byte)BH1750_DEFAULT_MTREG);
      break;
    default:
      break;
  }

  // Read two bytes from the sensor, which are low and high parts of the sensor