StrichLux

The Modular Lighting Controller will control various kinds of lighting via various protocols/interfaces, or convert between two of the supported protocols/interfaces without directly controlling any devices.

Project Log

• 2012-04: Status updates for individual I/O module are being tracked on each module's page.
• 2012-03-17: Completed BOM, schematic, and layout for DMX I/O module and I/O Breakout module. Both submitted to Laen for PCB manufacturing.
• 2012-03-13: Defined I/O Link connector pinout, started putting together BOM/schematic for DMX I/O module.
• 2012-03-12: Chose connectors, laid out basic core board interface components/defined sizes.
• 2012-03-06 - 2012-03-11: Defining specs, searching for appropriate parts.

Project Ideas

• Core Board, lets you plug in up to 4 input modules and 4 output modules plus an optional Power Module
  • Each of the 4 would be up to one DMX universe worth of channels (512)
  • SPI slave to each I/O module, 8 SPI slave transceivers total
  • RS232 for troubleshooting and configuring the core board itself
  • Local framebuffer memory
    • Dual-port memory would be best so the output and input sections can both deal with it independently
    • 8 bits per frame * 512 channels per universe * 4 universes = 16kbit (2kbyte) of framebuffer memory required
      • Twice that for double-buffering would be awesome, so 32kbit/4kbyte of dual-port memory wanted
    • Split into 4 channels, so each block would be 8kbit/1kbyte
    • Reading/writing needs to happen in parallel for each block
  • CPLD/FPGA seems a great fit for this
    • Lattice LFXP2-5E-5TN144C or Xilinx XC3S50-4VQG100C both seem like good fits
  • Since this will likely be the most powerful chip in the whole system, we could do transforms here to to take the load off the I/O modules
    • HSV->RGB
    • Input splitting (one input channel goes to two or more output channels)
    • Input combining (two or more input channels get combined via some function and go to a single output channel)
    • Scaling/offsetting (0-255 in = 32-64 out or such)
• Power Modules
  • Stack underneath the Core Board, provide high-power busses for directly powering lighting from the system.
  • Location makes sense because it doesn't block hot-swapping the I/O modules, but may be a thermal problem as it will get hot and heat up the Core Board
• Input-Only Modules
  • Analog input channels (not 512 though, likely)
• Output-Only Modules
  • LPD8806 LED strips
  • Other LED strips
  • Discrete power switches (relays/FETs/whatever)
• I/O Modules
  • DMX
  • Art-Net over Ethernet
  • Art-Net over WiFi
• Dimensions
  • Core board will be 3.95" x 6.25" (max limits of EAGLE Standard, will need to purchase)
  • Modules will be 1.525" x 1.925" (2x4 layout on the board for input/output x 4 channels)

Protocol

• Modules are SPI masters, Core Board is SPI slave (x8)
• Simple read/write commands compatible with SPI SRAMs for easier testing/bring-up
• Commands
  • 0000 0000 - NOOP - Do nothing
  • 0000 0001 - Reserved - Write STATUS on SPI SRAMs
  • 0000 0010 - WRITE - Write data to active "control" framebuffer
    • Argument 0 - Starting address
    • Further clock cycles auto-increments the address pointer and continue shifting in new data
  • 0000 0011 - READ - Read data from active "control" framebuffer
    • Argument 0 - Starting address
    • Further clock cycles auto-increments the address pointer and continue shifting out data
  • 0000 0101 - Reserved - Read STATUS on SPI SRAMs