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Thread: Teensy 3.2 I2C feature

  1. #1

    Teensy 3.2 I2C feature

    Hello.

    I am trying to connect a flow meter to a teensy 3.2 via I2C communication. I once connected two Arduino using I2C, but I've never connected two different devices before. The flow meter I am using is the SFM3300-250-D and its datasheet can be found here.

    The flow meter runs on 5V, so I'm a little worried about connecting the flow meter directly to the teensy. Should I be worried that a 5V signal from the i2C bus damage the teensy? I know that teensy 3.2 I/O pins are 5V tolerant, but I'm worried any small voltage fluctuation could still cause damage.

    Thanks as always.

  2. #2
    Junior Member
    Join Date
    Oct 2016
    Posts
    13
    The Teensy 5v tolerance is pretty good. You should not have a problem. Check the flowmeter to see if has pull up resistors. If not, you may need one on each of the SDA and SCL lines unless the wires are very short. 4.7k works.

    Ken

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