In this quick tutorial, we’ll put together a snazzy London Underground tube line status checker using a Raspberry Pi and Adafruit’s awesome Neopixel LED rings, to recreate the classic Underground roundel! We’ll light up the Neopixel LEDs using the official colours of the Tube lines, allowing you to cycle through your favourite tube lines and get an update on their status with a quick glance! Read on after the break to find out how to put it together!
Featured Adafruit Products!
NeoPixel Ring – 12 x WS2812 5050 RGB LED with Integrated Drivers: Round and round and round they go! 12 ultra bright smart LED NeoPixels are arranged in a circle with 1.5″ (37mm) outer diameter. The rings are ‘chainable’ – connect the output pin of one to the input pin of another. Use only one microcontroller pin to control as many as you can chain together! Each LED is addressable as the driver chip is inside the LED. Each one has ~18mA constant current drive so the color will be very consistent even if the voltage varies, and no external choke resistors are required making the design slim. Power the whole thing with 5VDC and you’re ready to rock. (read more)
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