1. New idea: Build a 9V battery supply for the Arduino.
Recently I’e been working with my Arduino Uno board a lot. It’s been a hassle to have the board with my project connected to my computer via usb for power/data. I decided it’s time for me to build a battery pack or buy one! I’ve done a bit of research and it seems pretty easy. Here is the link: http://playground.arduino.cc/Learning/9VBatteryAdapter. I’m currently looking for parts and the total seems to be around $3~5. I also want this powerpack to have an on/off switch so I don’t have to always disconnect the power to power off the Arduino.