On Tue, Jun 7, 2011 at 9:54 PM, Nils Eilers <email@example.com> wrote: > petSD has a project page now: > > http://home.germany.net/nils.eilers/petsd/ Very tantalizing. I happen to have a couple of each of these lying about... http://store.makerbot.com/sanguino-v1-0-pcb.html http://store.makerbot.com/motherboard-v1-2.html 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 firmware. 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! -ethan Message was sent through the cbm-hackers mailing listReceived on 2011-06-08 04:00:12
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