[App_rpt-users] USB GPIO recommended circuit

Stephen - K1LNX k1lnx at k1lnx.net
Mon Sep 25 09:16:36 EDT 2017


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 at 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
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