====== Arduino UNO I2C ======
~~DIR:.:~~

===== PINS =====
==== On all Arduinos UNO ====
  * A4 = SDA
  * A5 = SCL
{{:documentation:microcontroleurs:arduino:boards:uno:i2c:arduinouno_i2c_sda_scl_01.jpg?400|}}

==== On Arduino UNO R3 ====
  * A4 = SDA AREF - 1 pin (up right corner)
  * A5 = SCL AREF - 2 pins (up right corner)
{{:documentation:microcontroleurs:arduino:boards:uno:i2c:arduinouno_i2c_sda_scl_02.jpg?400|}}

===== CODE =====

===== BUS =====
{{:documentation:microcontroleurs:arduino:boards:uno:i2c:arduino_uno_i2c_bus.jpg|}}
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Pull-up resistors between SDA & VCC and between SCL & VCC ≈ 4.7kΩ (depends on bus capacitance - length - and desired speed).