GPIO# Read and Write# PRJ - Digital Read Serial PRJ - Blink PRJ - Analog Read Serial PRJ - Fading a LED PRJ - Debounce on a Pushbutton PRJ - State Change Detection (Edge Detection) for pushbuttons Sound# PRJ - Simple keyboard using the tone() PRJ - Tone on Multiple Speakers PRJ - Pitch follower using the tone() function PRJ - Play a Melody using the tone()