Matrix Input in SimVimCockpit
FMS: Predefined CDU

Key Matrix

How to Connect

This "slave" board is connected with the Master controller board. The "SimVim Matrix" firmware code of the slave board reads matrix grid state and sends it to the master board.

  • You can make key matrix with up to 176 nodes, actually you can use any grid from 2x2 to 16 x11
  • Only buttons can be used as input for matrix, not toggle switches or encoders.
  • To assign a button as key-matrix input in the configurator click the "Matrix" button above the assignment table to select the key matrix table.

The "slave" controller board (Uno, Nano) is linked with the Master controller board using serial interface, when Tx output signal of one board is connected to the Rx iput of another board.

For the slave output control the Tx1,Rx1 port are used in SimVim. So, you should always connect the Tx pin (#1) of the slave board with Rx1 pin (#19) of the master board, and "slave" Rx (pin 0) - with the "master" Tx1 (pin #18).

Note: The same Tx1/Rx1 are used for SimVim Stepper board. If you need to connectc both Stepper and matrix boards you need to connect them "in-chain" (Master Tx - to the slave #1 Rx, slave #1 Tx - the slave #2 Rx, the slave #2 Tx - to the master Rx)

Note 1. Never forget to connect the GNDs of each board ( and other devices as well) to the common GND wire.

Note 2: When you need to upload Matrix board firmware to the slave board you need to disconnect the Rx,Tx wires before uploading. To simplify this you simply can add a "shut-off" switch breaking this two wires.

Another option - you can leave the Rx/Tx connected, but press the Reset button on the master board and hold it while uploading stepper firmware to the slave board.

Don't keep it connected to USB port after the SimVim Matrix firmware upload. You can use any +5V source connected to the slave board using USB connector, or +5V pin.

Matrix Configuration

1. Click the [Matrix] selector in the top of the boards table to select the slave matrix table.

2.In the Configurator: select any momentary button parameter that you want to assign and select the matrix node you need.

SimVimCockpit FMS/CDU/ MCDU predefined matrix Configuration

The next SimVimCockpit version will have “embedded FMS/CDU” configuration for SimVimMatrix. Now, you won’t need to assign all those 140 buttons one-by-one, you’ll just need to select one device (Boeing CDU or Airbus MCDU) in the configurator.

See description on the SimVimCockpit Blog

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