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Connect your Panels!
The K32A-B is a cape for the BeagleBone Black designed to drive ws2811 LED pixels. It has 32 local ports (fused with LED indicators) that can each drive 800 pixels (with power injection) at 40FPS. It also has 4 RJ45 differential ports that can output an additional 16 strings. Finally, it has 2 RS485 outputs for DMX, PixelNet, Renard, LOR.
For end-user usability, it provides a Real Time Clock, temperature sensors, voltage sensors, a header for an OLED display, four push buttons for navigating menus on the display.
The K32A-B also has an on-board, high quality DAC chip for providing sound.
It also has two extra headers for additional functionality. One header provides access to the I2C bus and 8 GPIO pins for additional push buttons or other triggers a user may need.
What makes it special?
The 32 local ports provides more outputs than most controllers providing the ability to run a lot of pixels for dense props.
The 4 RJ45 ports provide additional output capabilities to allow for future expansions. All 4 of the ports can be configured to drive a ws2811 pixel differential receiver board. Both the “Smart Receivers” and the normal receivers are supported.
The BeagleBone can be powered by the same power supply powering the pixels. The Beagle can be powered through the K32 with 5V-18V power. Alternatively, the BeagleBone can be powered by its own barrel connector if an on-board jumper is removed.
Technical details: Both the DMX and ws2811 protocols are extremely timing dependent and are generally not drivable via a general purpose Linux CPU. The FPP software uses the two semi real-time PRU’s available on the PocketBeagle to handle the protocol specific timings. One PRU is used for the ws2811 protocol strings and the other PRU is used for the DMX timings. Using the PRU’s also allows the main CPU to be free for other things such as network IO.
You WILL need:
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