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Trinket-Powered Conference Room Occupancy Display
A LED matrix project that displays when a room is occupied
by Mike Barela
Is that meeting room occupied or not? Using just a few Adafruit parts centered around Trinket and a bi-color LED array, you can build a project which senses when a room is occupied and display the status outside the room. A red X tells you its occupied, a green square means its good to enter!
UPDATED
CircuitPython Hardware: LED Backpacks & FeatherWings
How to use LED Backpacks & FeatherWings with CircuitPython!
by Tony DiCola
Learn how to connect and use LED matrix and segment display backpacks & FeatherWings with a CircuitPython board. Focuses on CircuitPython and MicroPython for the ESP8266 and M0 / SAMD21.
Adafruit LED Backpacks
Control small LED matrices with ease
by lady ada
What's better than a single LED? Lots of LEDs! The matrices use a driver chip that does all the heavy lifting for you: They have a built in clock so they multiplex the display. They use constant-current drivers for ultra-bright, consistent color, 1/16 step display dimming, all via a simple I2C interface. Here is a detailed guide showing you how to solder, wire and control the display.
Collin's Lab: Breadboards & Perfboards
Build it for testing, build it for keeping.
by C. Cunningham
Follow along with Collin & learn how to bring a circuit from schematic to reality using a solderless breadboard - then make it permanent by reincarnating your circuit on sturdy perfboard.