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I couldn't find any information on how to operate a Sony Alpha A7 over IR from a home made source (arduino for instance) so I reveres engineered the codes and thought I would share.

I have an Airpixel commander and it is perfect for my UAV application and I recommend it. For a couple of other photography applications it is over kill so I wanted to be able to trigger and control my A7 over IR from another source.

The following are the codes I successfully tested from an Arduino suing IRremote library:

Photo     740239    B4B8F   // Shutter | take photo

VID       76687     12B8F   // Start | stop video recording

DISP      166799    28B8F   // Display change cycles round

Menu      117647    1CB8F   // Enter menu | leave menu

MenuU     379791    5CB8F   // Menu up

menuD     904079    DCB8F   // Menu down

menuR     1035151   FCB8F   // Menu right

menuL     510863    7CB8F   // Menu left

OK        641937    9CB91   // Menu OK

Z+        338831    52B8F   // Zoom in

Z-        863119    D2B8F   // Zoom out

The IRremote library has plenty of examples but the sony library you need is the 20 nit version and 3 repeats of the code appear to be needed. This code works fine.
This is to trigger a photo capture using the decimal code.

  for (int i=0; i<3; i++){       irsend.sendSony(740239, 20); // shutter       delay(40);  }

This is the same function using hex ( the 0x is added to denote hex)


  for (int i=0; i<3; i++){       irsend.sendSony(0xB4B8F, 20); // shutter       delay(40);  }

I am sure I will now be inundated with links to complete documentation, but it's here if anyone needs it.