i2C: Projects & info

[last updated: 2017-10-16]
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• i2C is a protocol for serial communication:
  it only requires 2 signal lines plus ground:
  • SCL = serial Clock (usu pin A5)
  • SDA = serial Data (usu pin A4)
  • SDA & SCL lines need pullup resistors,
    however the Wire.h library enables the Arduino's internal pullups
    when initializing with Wire.begin().
• Two or more nodes communicate according to:
  • one master
    (however there are ways to use more than one master - see details later)
  • one or more slaves
• Range is probably 1 - 3 meters.
  • researching this subject on the net reveals lots of different opinions:
  • The answer apparently depends mostly on capacitance between the wires.
  • There are reports of achieving 25m or even more.
  • At some point I'll just get some longer wires and test it myself...
• Most common library is built-in Wire.h
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• Projects:
  • i2C_simple
  • i2C_keypad
  • i2C_two-way-single
  • i2C_two-way-multiple

• See also:
  i2C on DigiSpark
  i2c on rPi for GMC

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