Re: petSD project page

From: Ethan Dicks <>
Date: Tue, 7 Jun 2011 22:30:10 -0500
Message-ID: <>
On Tue, Jun 7, 2011 at 9:54 PM, Nils Eilers <> wrote:
> petSD has a project page now:

Very tantalizing.

I happen to have a couple of each of these lying about...

They were designed with the ATmega644P in mind, so I'm curious how
large the petSD code really is and if there are features which could
be trimmed to keep it in 64K of code space.  The Makerbot
"Motherboard" already has an SD socket on it, and has the I/O pins
broken out into 4 groups (in Arduino terms, D0-D7+reset, GND+D8-D14,
D15-D23, and A0-A7+Aref+GND) plus four pads of I2C (Vcc, GND, SDA,
SCL).  I'm not suggesting "don't make a dedicated petSD board", but I
am curious if it would be worth attempting to make a small riser board
with the SN75160/75161 on it, and possibly adding support to the code
to use a DS1307 (very common in the Arduino world and available as a
self-contained kit with on-board battery backup for under $10 USD) to
use the Makerbot Motherboard as a development platform for the petSD

In case you are wondering how it's powered, the Motherboard expects to
get +5V and +3.3 from an ATX PSU.  There is an alternate assembly
technique that replaces the ATX  connector with a TO-92 3.3V regulator
and some filter caps, so it can be run from external +5V-only and
still have +3.3V available to power the SD socket.

Keep up the good work!


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Received on 2011-06-08 04:00:12

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