I haven't used it yet, but I purchased one of these for that exact purpose: https://www.adafruit.com/product/1875 It's a bi-directional shifter, which you've already thought of, so may or may not help :) 73 Stephen K1LNX On Thu, Sep 21, 2017 at 3:20 PM, Bryan Fields <Bryan@bryanfields.net> wrote:

Is there a best practices for interfacing 5v TTL logic with the 3.3v logic on the GPIO pins? I was thinking a bi-directional shifter would be good, but there are so many different ways to do this.

Is there a best current practice for this? -- Bryan Fields

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