I'm in the process of mapping out my power needs for a project. Here are all the components:
13 * Arduino Pro Minis (5V/16Mhz/ATmega328)
1 * bluetooth modem
1 * digital compass
77 * photocells (6/arduino) (http://www.sparkfun.com/commerce/product_info.php?products_id=9088
Everything will run off 5V (what that is is still TBD, but certainly battery power). Modem draws ~30mA, compass ~5mA, and each arduino I'm estimating at 10mA (primarily to power the ATmega328). That's a total of ~165mA, which I could easily power with 4AA's (or step-up a couple AA's)...which is of course making me question my math here.
My question is what do each of the photocells add to the current draw, or do they it? I'm afraid I'm learning electrical engineering on the fly, and not sure how to plan for this.
Thanks in advance!
EDIT: the Arduino's will all be talking to each other via I2C, e.g. http://www.uchobby.com/index.php/2008/09/16/introduction-to-i2c
...I imagine that would also impact the current draw/arduino?