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InputExtension
Mainboard
OutputExtension
InputExtension_3d.jpg
InputExtension_Schem.pdf
Mainboard_3d.jpg
Mainboard_Schem.pdf
README.md

README.md

Fan-Tas-Tic-PCB

Kicad files for the Fan-Tas-Tic pinball controller. No tiny SMD components, can be easily assembled by hand. Designed for the milling machine (2 sided but no real vias, using through hole components instead).

Mainboard

3D view of the Mainboard

  • Based on TM4C123GXL evaluation board
  • 8x8 Switch matrix inputs (Operating on 12 V)
  • 12 x onboard open drain drivers for solenoids. 4 of them can do hardware PWM (> 100 kHz). Fused in groups of 4.
  • 4 x I2C channels for hardware extension boards. In- / Outputs can be easily and cheaply added with PCF8574 I2C GPIO extenders (check eBay for cheap I/O modules)
  • 3 x SPI channels for running WS2811 / WS2812 LED strings. Up to 1024 LEDs / channel.
  • USB virtual serial connection to host PC (or Raspberry PI)
  • 5 V can come from USB or from external 24 V input (Set JP1)

Input Board

3D view of the input extension board

  • 8 ch. Input extension
  • ... in progress ..

Solenoid Board

  • 8 ch. Solenoid extension
  • ... in progress ...

About the components

  • SMD resistors / capacitors = 0805
  • Switch matrix driver: TPIC6B595 (eBay)
  • GPIO extender: PCF8574 (eBay)
  • Dual power mosfet driver: UCC27524
  • Power mosfets: IRL640
  • Signal mosfet for level conversion: BSS138
  • 8 pin solenoid and 4 pin power connectors: HT396
  • 8 pin switch-matrix and 4 pin I2C connectors: KF2510

Status

The current version of the Mainboard PCB (06/2016) has been tested and worked as expected without any major problems. See also the development blog. For the next revision, these (minor) issues will be fixed:

  • Debug USB connector on the Tiva board interferes with the I2C connectors on the mainboard. These will be moved.
  • An Interlock Relay will be introduced on the 24 V supply line for the solenoid drivers. This is needed as the I2C port extenders have by default all outputs active before beeing initialized (which only happens a few 10 ms after power up). Furthermore, if the firmware crashes, has I2C connection issues or locks up, it can cut the power from an fault-handler.
  • Freewheeling diodes MUST be Schottky diodes and will be included on the PCB next to the mosfets (not on the solenoids!) for accetable EMI performance. This has been found experimentally (http://yetifrisstlama.blogspot.fr/).
  • More footprints for decoupling caps will be included