Let's Make Robots!

RTC and RFID

Hello LMR! This is sort-of a Two in one question. I need some assistance figuring how to hook up and program the following: 1. RFID - I've been eying this for a while now: http://www.sparkfun.com/products/8419. I understand that pin 5 will tell you when a card is present, and 8 & 9 look like i2c, but what is pin 7 (format selector)? What sort of object (propeller) would I use to drive it, i2c? What about the cp pin? 2. RTC - I've also wanted to do some experiments with this cool little chip: http://www.sparkfun.com/products/10160.

AC wall power

I need to power 2 picaxes and 25 LEDs, each with it's own 1k resistor. Also a small DC motor. I would like to use an AC adapter, but only what is necessary (need the others for later). I have three 5V adapters: 250ma, 400ma, and 1A. Which should I use?