Re: [gpsd-dev] [gpsd-users] 1PPS on the Pi - let's pool our knowledge.

[Fred Hillhouse]

I finally had to acquaint myself with the Adafruit GPS hat. I had a feeling
that pin 4 was not what I thought it was.

Maybe it seems like semantics but when I talk about pins it means the actual
pin on the device whether a connector or IC. For instance, on the IO
connector, pin 7 is GPIO4, and pin 4 is 5V.

For those that are using the various devices and seeing references to pin 4
they may be confused which means they may connect to 5V rather than GPIO4.

Regarding the Adafruit hat, #4 is the same as GPIO4 on pin 7. In the hopes
of making things simpler, I feel Adafruit's decision to label it this way
only serves to muddy the waters.

If the effort is to create documentation that is meaningful to as many as
possible, then I recommend calling items of interest what they are. If
referring to the hat then #4 is appropriate.

I do agree the GPIO on the hat is the same as the RPi GPIO. They connections
are transferred from one to the other.

Best regards,
Fred

PS. The Adafruit hat I looked at:
    https://learn.adafruit.com/assets/21930




-----Original Message-----
From: gpsd-users
[mailto:address@hidden On Behalf Of
Gary E. Miller
Sent: Wednesday, April 20, 2016 3:44 PM
To: Jon Brase
Cc: address@hidden; Phil Salkie; Mark Atwood; address@hidden
Subject: Re: [gpsd-users] 1PPS on the Pi - let's pool our knowledge.

Yo Jon!

On Wed, 20 Apr 2016 02:37:18 -0500
Jon Brase <address@hidden> wrote:

> I'm confused: I'm pretty sure Eric was talking about GPIO pins on the
> Pi, not the pins on the hat,

They are one and the same.  The HAT plugs into the GPIO pins, power etc.

> The hat may be wired to use its pin 4 to output PPS, but
> as far as I can tell, you can jumper that to any GPIO pin you want on
> the Pi

And as I previously saiid, sure I can cut traces and solder in new wires,
but out of the box, plug it in and it is on pin 4.

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        address@hidden  Tel:+1 541 382 8588