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OPP EM Combo boards

This section is maintained by the hardware maker

This section of the MPF website is about a specific company's pinball controller hardware, and they are responsible for maintaining the content here.

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The aim of this project is to provide cheap hardware to control EM pinball machines:

  • O16I16: 16 soldenoid / incandescent outputs and 16 inputs combo card
  • O32: 32 outputs soldenoid / incandescent combo card

Firmware is currently a fork of open-pinball-project at version 2.4.0.0, hosted at gitlab.

A single BluePill MCU may control up to 32 GPIO lines, logically divided in 4 wings of 8 lines each.

A wing is usually specialized (switch inputs, solenoids, lamps, ...) according to the hardware attached.

This version focuses on the blue pill plus which has the advantage of having a blue LED on PB2 which is not used by card headers. It also features an USBC-C connector.

The size of the board is about 150 x 125 mm.

Several boards are required to drive an EM machine. According to the complexity and your personal taste, 3-4 to drive the play field, 2-3 to drive the light box.

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Configuration

A typical configuration will use the card serial number to identify the boeard, not the port name which may change after host reboot. In this example, coil c_player1_reel10 has number 0-0-0 meaning:

0-?-?: driven by card id #0

?-0-?: always 0 (1 usb port only drives one MCU)

?-?-0: first output (that is wing 0, pin 0)

Coil c_player1_reel100 is driven by the same card, second output (that is wing 0, pin 1)

#config_version=6

hardware:
  platform: opp
  driverboards: gen2

opp:
    ports: /dev/ttyACM0, /dev/ttyACM1,/dev/ttyACM2, /dev/ttyACM3, /dev/ttyACM4, /dev/ttyACM5, /dev/ttyACM6

coils:
  # Board LB_1_16O16, id #0
  c_player1_reel10:
    number: 0-0-0
    default_pulse_ms: 7
  c_player1_reel100:
    number: 0-0-1
    default_pulse_ms: 7

To set the card serial number and configure the wings, one will have to read the interface manual and use a PC with gen2test.py utility.

In the above example one would do:

./gen2test.py --serial 0
./gen2test.py --config opp16o16icfg.py
./gen2test.py --save

My project

With those boards, I digitized a 1975 Gottlieb Fast Draw, which was presented to the Pontacq Pinball Show on June 1rst-2nd, 2024, South of France, where it ran 375 plays without any software problem.

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