Hi,
I run into strange problem with DS1307 as mentioned by many others.
My setup  uses SD-shield, DS18B20 sensors, LCD from Nokia3310, DS1307. All blocks worked fine separately and might going very badly in combinations. Then I foung that http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1222946089 thread, where it was suggested possible out of memory error. Then very helpful article http://itp.nyu.edu/~gpv206/2008/04/making_the_most_of_arduino_mem.html.
Suggestions from this article helped me to get all modules to work together.. except DS1307 It was last in the chain though..
Then I found function FreeRam() from fat16lib which I use for SD operations and started to play with it.
Some results are that:
- bare sketch (it just outputs FreeRam value in setup and loop) gives 836 bytes of free RAM (with ATmega168);
- + #include <Wire.h> leaves  814 bytes;
- + #include <DS1307.h> leaves 622 bytes.
So if with my current sketch which shows 170 bytes of free RAM I add include for DS1307.h it dies for sure.
Is not it too high price for one i2c device to take 200 bytes of RAM?
Especially in situation where I just want to get timestamp from it and store it on SD with other datas..

Thanks westfw,
I've tried 10PI chip on Freeduino board and everything works fine.

hi RonaldB,
I have couple of Atmega168V-10PI - the only ones in DIP package I could buy locally.
I put one in self made simple board with 10Mhz crystal.
The only thing which is not working for now is uploading sketches via serial cable. Hope this is solvable but currently I'm using USBtinyISP programmer.

Is it possible to use two of this shields at the same time, if I need even more analog inputs?

4-wire pc fan is easily controlled from pwm pin. None of the shields required. Such fan has an internal transistor to accept PWM signal.
Would that work as an option?

OK. Found it..

Could you also provide kicad design or help with that arduinoshield.zip you mensioned in another thread?
Thanks in advance.

May be this link would be usefull as well:
http://gizmologi.st/2009/04/taking-pictures-with-arduino/
Discussed somewhere on this forum...

Interesting thread. I'm keeping this link for further investigation - http://www.circuitcellar.com/library/print/0798/May96/index.htm

Updates: mirror reflectance was my mistake - left test changes. Characters turned half round - suppose some bugs in initialization.
Now display is working, will try to figure what changes were so critical.

Hi all, I've got this lcd working using schematics and demo code from nuelectronics' Nokia 3310 LCD shield v1.0. Now I have one question and one problem.
The question is that in this thread is duscussed how to properly set i/o signals to 3.3v level. The nuelectronics' schematic does not use any level shifts and there is note on schematic saying "VCC -3.3V - 5V  All logic I/O compatible with 5V & 3.3V logic level". I've powered my lcd direct from 5v line from Arduino board and no level shifts on i/o lines. And everything worked. How could you explain this differencies?
Everything worked until I started to move SPI SS signal from default PB2 pin to PD6 pin (as I want to add SD-shield later where SS pin to PB2 is hardwired). The problem that characters are output turned up side down or mirror reflected against vertical axis. I have not figured it out yet which code modification gives either view but it always screwed somehow. I have read many threads like "two SPI devices on a bus" on the forum and tried few suggestions from there without further progress on the output. What may cause such a behaviour of the lcd?
Thanks in advance.

Thanks Nicko,

I'm testing different tools and use contacts you've suggested. Will come back later to discuss..

Nicko thanks!
I have not used Eagle much yet and I see the feature you referenced as very helpful. Will play with it more.

But also I do not see that BOM info (produced with bom.ulp or other tools) is shared within the many projects.

If anybody knows about BOM's like these available for any open hardware projects - please let me know.

Thanks again.

graymalkin thanks!
What boards would you like to be there?

Hi all,

I have started filling BOM (Bill Of Materials) database for Arduino related and other open hardware boards here - http://www.beeduino.org/bomdb/ .
My first aim is to get BOM for a few boards fully complete. Check at the same time how thing are going internally.

When working with new BOM, on the first step I do export partlist into a file (usually from Eagle design files). Second - the file is loaded into db and restructured (similar parts are grouped into one row) . Third step - additional info about earch part is assigned with searches for part in http://octopart.com and http://search.digikey.com
If you see some rows empty - then it is yet hard to me to find that particular part with full info in the sources that I said.

I am trying to gather info that seems could be helphul when you learning about new board even if you have assembled board or a full kit.

Are you agree? Any comments or suggestions would be greatly appreciated.

Dmitry