Format your SD card - FAT
Copy OS to the card - I used NOOBS/Raspbian
Board Numbering vs. Broadcom SOC channel Numbering (aka BCM Numbering)
Common LEDs have a 2V drop & light up with 4mA of current.
Connecting the LED to 5V, means 3V are being passed through to ground.
Commonly with RGB LEDs
# Get info info = `identify colorbar.png`.split #=> ["colorbar.png", "PNG", "168x64", "168x64+0+0", "8-bit", ... info # normalized and identified file format, like PNG etc. info.split("x") # Image height in pixels # Convert to PPM and set height to 16px `convert awesome.jpg -resize x16 awesome.ppm`
Ruby Running Commands
OR, use the mini_magic gem
Dog Ball Thrower / Boss Detector / Music Timed Fireworks