Using my own created I2C-instance with the Adafruit_MLX90614 infrared-thermopile-sensor

Projects Programming
1

The Adafruit_MLX90614-library has this begin-function in the

Adafruit_MLX90614.cpp

bool Adafruit_MLX90614::begin(uint8_t addr, TwoWire *wire) {
  _addr = addr; // needed for CRC
  if (i2c_dev)
    delete i2c_dev;
  i2c_dev = new Adafruit_I2CDevice(addr, wire);
  return i2c_dev->begin();
}

Do I understand right that If I want to use f.e. an ESP32 with non-standard-I²C-io-pins I would have to code it this way

#define I2C_SDA 16
#define I2C_SCL 17

#define MLX90614_I2C_ADRR 0x5a

void setup() {
  Serial.begin(115200);
  while (!Serial);
  Serial.println("Setup-Start");
  PrintFileNameDateTime();

  Wire.begin(I2C_SDA, I2C_SCL);
  
  if (  !mlx.begin(MLX90614_I2C_ADRR,Wire) ) {
    Serial.println("Error connecting to MLX sensor. Check wiring.");
    Serial.println("microcontroller freezed with while(true)");
    while (true);
  };
}

or do I have two code

mlx.begin(MLX90614_I2C_ADRR,*Wire)

mlx.begin(MLX90614_I2C_ADRR, *Wire)

best regards Stefan

2

Neither. The begin() function takes a pointer to an object of the TwoWire class. So it would be:

mlx.begin(MLX90614_I2C_ADRR, &Wire)
3

Hi @gfvalvo

thank you very much for answering quick.
Code does compile. Now I have to do a real test....

4

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