Uint16_t lux = lightMeter. The read actually starts with a write - to send the address of the desired register. Why Do This Consider a typical I2C transaction for reading a register value from a target device. It is just a special name given to the second one. LightMeter.begin(BH1750::ONE_TIME_HIGH_RES_MODE,0x23,I2Clightmeter) The repeated start signal is identical to the original start signal. So instead you have to use dynamic allocation to control it: TwoWire *I2Clightmeter But you can't do that with the way you normally define the object. The ESP32 system is set up so that if the TwoWire instance is destructed the I2C bus is released. However it means changing how you define your I2C object. If(Wire.There is a way of doing it that's ESP32 specific. Wire.requestFrom(SensorAddress, byte(2)) Returns the last range that the sensor determined in its last ranging cycle in centimeters. Wire.endTransmission() //Stop and do something else now Wire.write(RangeCommand) //send range command Wire.beginTransmission(SensorAddress) //Start addressing Commands the sensor to take a range reading Serial.print("Range: ") Serial.println(range) //Print to the user Word range = requestRange() //Get the range from the sensor TakeRangeReading() //Tell the sensor to perform a ranging cycle Serial.begin(115200) //Open serial connection at 9600 baud These are the two commands that need to be sent in sequence to change the sensor address The sensors ranging command has a value of 0x51
The Arduino Wire library uses the 7-bit version of the address, so the code example uses 0x70 instead of the 8-bit 0圎0 For and Arduino Board it is not a problem, but for the ESP32. This is the mayor problem because instead of not reacting, slaves can behave erratically. I2C has no way of figuring out if transmitted data is corrupted or not. a slave which is actually there does not acknowledge. However, I keep getting an error while compiling. bask185 133 4 You can only get little information about unsuccessful transmission as long as e.g. I'm trying to get a GY-US-42 ultrasonic sensor working on the ESP32.
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