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

727-409-1194 - Voice
http://bryanfields.net
_______________________________________________
App_rpt-users mailing list
App_rpt-users@lists.allstarlink.org
http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users

To unsubscribe from this list please visit http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users and scroll down to the bottom of the page. Enter your email address and press the "Unsubscribe or edit options button"
You do not need a password to unsubscribe, you can do it via email confirmation. If you have trouble unsubscribing, please send a message to the list detailing the problem.