[time-nuts] PICTIC II ready-made?

[David]

On Wed, 25 Apr 2012 11:13:42 -0700, Chris Albertson
<albertson.chris at gmail.com> wrote:

>On Wed, Apr 25, 2012 at 9:37 AM, Don Latham <djl at montana.com> wrote:
>
>> I forgot to add that a simple redrafting of the II as an Arduino shield
>> with appropriate chips and chip passives would accomplish the desired
>> end without losing the very careful engineering and testing that has
>> already been done?
>> Would be nice to have a way to change caps without soldering as well,
>> maybe just some .1" jumpers?
>
>Yes, MOST of the design could be re-used.  As an Arduino shield there is no
>need for a PIC or RS-232 interface becusethe Arduino does that function.
> You'd need to replace the 74ACT175 part but that is not hard.
>
>About changing the cap values without soldering.  I guess you could push
>the leads into a 0.1 inch header strip or install several and use a DIP
>switch to select which are "in".   But I don't know if the extra inductance
>al that wiring adds is enough to worry about.

One problem with the design in this case is that it requires 8 or 9
I/O pins making the use of additional Arduino shields difficult. Would
you add tri-state buffering and a chip select?