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Thread: I2C Serial Communication between two Teensy 3.2

  1. #1
    Junior Member
    Join Date
    Dec 2018

    I2C Serial Communication between two Teensy 3.2

    Hi Everyone.
    So I have a two teensy 3.2 boards and I would like to create a serial communication between the two.

    I found a tutorial on However, the author uses two Arduino Uno.
    I tried doing the same thing on my two teensy boards.

    However nothing happens whenever I tried pushing the button on master board. Supposed to be, the led on the slave board should lit.

    Could anyone help me on what connections and wiring should be done on my teensy boards?

    Thank you!

  2. #2
    Senior Member+ Theremingenieur's Avatar
    Join Date
    Feb 2014
    Colmar, France
    Studying the respective data sheets and using an oscilloscope to diagnose the SDA and SCL lines would have told you a fundamental difference between Arduino and Teensy: While the Arduinos have the required pull-up resistors for the I2C lines integrated, the Teensys do not so to allow the use of optimized resistor values depending on line length, parasitic inductances and capacitances. For short connections, a good starting point is using a 3k3 or 4k7 resistor from each line, SDA and SCL, towards 3.3V.

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