M5StickC NCIR Hat has SDA 0, SCL 26. But the defualt SDA(32) and SCL(33) cannot be changed.

[iotmaker-cc]

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If you're sure this issue is a defect in the code and checked the steps above please fill in the following fields to provide enough troubleshooting information. You may delete the guideline and text above to just leave the following details:

• Arduino board: M5StickC

• Arduino IDE version (found in Arduino -> About Arduino menu): 1.8.12

• List the steps to reproduce the problem below (if possible attach a sketch or copy the sketch code in too):

  1) begin() method only call Wire.begin() There is no argument and only use defualt SDA and SCL for Wire.begin(). M5StickC has deafult SDA 32 and SCL 32. But M5StickC NICR Hat uses SDA 0 and SCL 26. So there is a need to set new SDA and SCL. 2) My recommendation

  At Adafruit_MLX90614.h

  if defined(ESP8266)

  bool begin(int sda, int scl); bool begin(int sda, int scl, uint8_t address); bool begin();

  elif defined(ESP32)

  bool begin(int sda=-1, int scl=-1, uint32_t frequency=0);

  else

  bool begin();

  endif

  At Adafruit_MLX90614.cpp

  if defined(ESP8266)

  bool Adafruit_MLX90614::begin(int sdaPin, int sclPin) { Wire.begin(sdaPin,sclPin); return true; }

  bool Adafruit_MLX90614::begin(int sdaPin, int sclPin, uint8_t address) { Wire.begin(sdaPin,sclPin,address); return true; }

  bool Adafruit_MLX90614::begin() { Wire.begin(); return true; }

  elif defined(ESP32)

  bool Adafruit_MLX90614::begin(int sdaPin, int sclPin, uint32_t frequency) { Wire.begin(sdaPin,sclPin,frequency); return true; }

  else

  bool Adafruit_MLX90614::begin() { Wire.begin(); return true; }

  endif

[ladyada]

please chat with m5stack so they can update their documentation

[iotmaker-cc]

please chat with m5stack so they can update their documentation

I think it is not the problem on M5stack documentation.

My recommendation is that your begin() method needs additional arguments to set new SDA and SCL pin number for general purpose.

[ladyada]

that is not standard usage for Arduino, m5stack needs to update their core to have a default I2C port

[iotmaker-cc]

that is not standard usage for Arduino, m5stack needs to update their core to have a default I2C port

I understand what you say. In case of ESP32, I2C pins can be allocated dynamically, and can have two I2C pins at the same time. So it is better your begin() method can choose I2C pins. M5StickC has one grove connector (pin no 32,33) and it can be used as default I2C, but it has other pins(pin no 0,26) on the head side that can be used as another I2C. Their NICR hat is attached on the head side, and it uses second I2C. So it is better for your begin() method to have arguments to select I2C pins.

At this time, to solve the problem I can use Wire.begin(0,26) instesd of using your mlx.begin().

Regards.

[ladyada]

you can use setPins https://github.com/espressif/arduino-esp32/issues/3779

[iotmaker-cc]

you can use setPins espressif/arduino-esp32#3779

Thanks a lot !!!