Connecting mcwhlr Magic Panel

Version 1.3 and later of the HP Controller firmware is compatible with Michael Wheeler's excellent Magic Panel.

The panel connects to the slave MarcDuino board (2nd board, HP Controller) in place of a simple LED or my HoloLight driver.

The magic panels have been shipped with two different versions of the software, and you need to connect them slightly differently.
The magic panel should respond to the on, off and flicker R2 Touch commands. The panel should also trigger automatically in the scream and faint (short circuit) sequences issued by R2 Touch. Other Magic Panel modes are not supported at present.

First Magic Panels run

Besides the power supply, connect the blue and black wires as shown between the Magic Panel and the header marked SRV10 on the HP MarcDuino. The black wires connect the ground together (and is optional if the two boards are powered by the same ground), while the blue wire connects to the signal pin of the SRV10 header.

Here is a detailed view of the wire locations on the Magic Panel. They are on the row closest to the edge of the board. If the boards share a common power ground, the only connection you need is the blue wire, you can omit the black one.

Detail of the wire locations on the MarcDuino (this is from an early prototype board, but location is the same on the newer boards)

Later Magic Panels

The pins have moved around. I haven't tested this, but users of new panels report this wiring works:
The S pin goes to the pin marked 3 on the magic panel, and the - pin goes to the magic panel pin marked 4.