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Thread: Teensy 4.0 Ethernet

  1. #1
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    Teensy 4.0 Ethernet

    I'm hoping to connect multiple teensy 4.0's together to form a sort of local area network. The plan was to do this using ethernet and the WIZ850io ethernet module. However I am now wondering if the teensy 4.0 actually supports ethernet at all. Does it?

  2. #2
    Senior Member vjmuzik's Avatar
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    The current Teensy 4.0 does not have all of the Ethernet pins broken out so the native Ethernet can not be used but the standard Wiznet SPI modules work perfectly fine with it.

  3. #3
    Senior Member PaulStoffregen's Avatar
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    Quote Originally Posted by CiaranMc View Post
    The plan was to do this using ethernet and the WIZ850io ethernet module. However I am now wondering if the teensy 4.0 actually supports ethernet at all. Does it?
    Yes, WIZ850io works fine.

  4. #4
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    Thanks vjmuzik and PaulStoffregen. According to the ethernet guide on the pjrc website (https://www.pjrc.com/store/wiz820_sd_adaptor.html) the WIZ850io needs to be connected to the teensy as follows: Click image for larger version. 

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ID:	17451 The guide also suggests using the WIZ820_SD_ADAPTOR. Is this adapter required to use ethernet with the WIZ850io and teensy 4.0, or could the WIZ850io be connected up directly to the teensy 4.0?

  5. #5
    Senior Member vjmuzik's Avatar
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    The adapter just makes it easy to stack it on top of the Teensy. You can breadboard it out or just run jumper wires between the two. For high speeds on the spi bus it’s not always stable to use jumper wires but it’s certainly possible.

  6. #6
    Senior Member PaulStoffregen's Avatar
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    The older WIZ820io needed a reset pulse. It would not work at all without the reset pulse and would even interfere with other SPI chips. That older W5200 chip could be used without the shield, but it needed either a reset circuit (as on the shield) or a pin to pulse the reset signal.

    Thankfully the new W5500 chip fixed those problems, so you don't need the reset circuit or a reset pulse, though it certainly doesn't hurt. You can just connect the WIZ850io with wires.

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