I think I have all of this hooked up correctly, but using i2cdetect doesn't show anything, and looking in /dev doesn't reveal any i2c* devices.
I'm assuming the project is powering the i2c backpack/8x8 matrix with the Cobbler's 3V3 connection. Am I wrong? Am I supposed to use a separate PS to power the backpack/display?
BTW I'm powering the Pi with a Kindle power supply, which is theoretically 800mA. I am wondering if it can't keep up with the combination of Pi/USB wireless adaptor/backpack-LED display.
This is my first test of the Cobbler -- maybe I should just try lighting up a single LED 8^) .
San Jose, CA