Hexascroller has been a central fixture at NYCR for the past few years, with a few ups and downs. It’s replacement, Octoscroller, improves on our classic message alert polygon by having two more sides and two more colors of LEDs.
The brains are a BeagleBone Black running the LEDscape custom PRU firmware. The AM355 CPU in the BBB has two separate realtime microcontrollers built into its die, both with full access to the GPIO lines and cache coherent access to main memory. This bit of hardware/software allows the user application to simply render into a frame buffer, which is then driven to the panels by the PRU.
The key component of Octoscroller are these 16×32 RGB panels from Adafruit. Unlike the popular WS281x LED strips that have their own PWM hardware builtin to each pixel, these panels are very inexpensive since they require continuous refresh by an external driver. The Arduino firmware can only drive a single panel and consumes a significant amount of CPU interrupt time to maintain the image. With LEDscape, the BBB can drive up to four chains of four panels each at 0% CPU load. Powering the panels and the BeagleBone is a 5V 10A DC supply
We are angry, frustrated, and in pain because of the violence and murder of Black people by the police because of racism. We are in the fight AGAINST RACISM. George Floyd was murdered, his life stolen. The Adafruit teams have specific actions we’ve done, are doing, and will do together as a company and culture. We are asking the Adafruit community to get involved and share what you are doing. The Adafruit teams will not settle for a hash tag, a Tweet, or an icon change. We will work on real change, and that requires real action and real work together. That is what we will do each day, each month, each year – we will hold ourselves accountable and publish our collective efforts, partnerships, activism, donations, openly and publicly. Our blog and social media platforms will be utilized in actionable ways. Join us and the anti-racist efforts working to end police brutality, reform the criminal justice system, and dismantle the many other forms of systemic racism at work in this country, read more @ adafruit.com/blacklivesmatter
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.