# I2C Component

* I2C Modules

| Item                                    | Board      | Chipset     | Address                                       |
| --------------------------------------- | ---------- | ----------- | --------------------------------------------- |
| 3-Axis Magnetic Electronic Compass      | GY271      | HMC5883L    | 0x1E                                          |
| 3-Axis Magnetometer Acceleration Sensor | GY-LSM303C | LSM 303C    | accelerometer : 0x1D, magnetometer : 0x1E |
| Infrared Temperature Sensor             | GY-906     | MLX90614ESF | 0x5A                                          |

* Datasheet
  + [HMC5883L](https://cdn-shop.adafruit.com/datasheets/HMC5883L_3-Axis_Digital_Compass_IC.pdf)
  + [LSM303C](https://www.mouser.com/datasheet/2/389/lsm303agr-954987.pdf)
  + [MLX90614ESF](https://www.melexis.com/-/media/files/documents/datasheets/mlx90614-datasheet-melexis.pdf)

  * Schematic
    + [LSM303C](https://www.tme.eu/Document/3efb39d16e2f2e2f9f16bb5c89784b47/POLOLU-2127.pdf)
    + [Adafruit LSM303C](https://learn.adafruit.com/lsm303-accelerometer-slash-compass-breakout?view=all)

* Arduino Library
  + [GY271](.\arduino-lib\Mecha_QMC5883L)
  + [GY-906](https://github.com/adafruit/Adafruit-MLX90614-Library)

* Tutorial
  + [GY271](https://www.instructables.com/id/Tutorial-to-Interface-HMC-5833L-With-Arduino-Uno/)
  + [GY-LSM303C](https://learn.adafruit.com/lsm303-accelerometer-slash-compass-breakout/coding)
  + [GY-906](https://create.arduino.cc/projecthub/SurtrTech/contactless-temperature-sensor-mlx90614-1e7bc7)

* ESP8266
  + Software controlled
  + pin assignment defined
  
  ```
  C:\Users\<user>\Documents\ArduinoData\packages\esp8266\hardware\esp8266\2.7.4\variants
  ```
  
  + SCL / SDA pinout

Description | SCL | SDA | Remark
---|---|---|---
Official | MTMS (GPIO14) | GPIO2 |
Try | GPIO0 | GPIO2 |
Try | GPIO5 | GPIO4 | Wire() Default for generic esp8266

  + The change Wire default, update begin(SDA, SCL)
  ```
  Wire.begin(2, 0)
  ```

* ESP32
  + Hardware Controlled
  + Pinout

Description | SCL | SDA | Remark
---|---|---|---
Official | GPIO22 | GPIO21 | Default