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SCL & SDA Pins on Arduino family

  • GND goes to ground
  • Vin goes to 5V
  • SDA to I2C Data (on the Uno, this is A4 on the Mega it is 20 and on the Leonardo digital 2)
  • SCL  to I2C Clock(on the Uno, this is A5 on the Mega it is 21 and on the Leonardo digital 3)