Hello, I'm new to Arduino but plan to start a project very soon. Here is what I want to prototype (generally speaking): a passive sensor first triggers the Arduino board(s) when an event happens. Then a CMOS camera snaps a picture and sends it to an email or saves it to an sd card. system goes back to idle once it's completed. The system will be battery operated. It seems that WifiShield can provide me with the wifi connectivity and memory to save the picture to an SD card. But I have a few questions: 1. Is the WifiShield an additional component to the Arduino board? 2. If so, which board should I get along with it (I'll probably have 3-4 LED and 2 on/off switches)? Ideally, since dimensions and battery life are important here, I would hope for the Arduino Nano.... 3. Does anyone familiar with a very short focal length CMOS/CCD camera or sensor (low end, I just need black and white)?
Any suggestion will be highly appreciated. Thank you,