A simple Arduino sketch that converts the SUMD signal of a Graupner 12 channel receiver like the GR-12L into a joystick. The code was tested on an Arduino Leonard, a Arduino Pro Mini should also work.
It is assumed that the Remote is setup as a Plane, with a single aileron channel and standard Elevator, rudder and a single motor. The channel mapping follows the Graupner default assignment:
| Channel | Joystick |
|---|---|
| 1 | Y-Axis |
| 2 | Rx-Axis |
| 3 | Ry-Axis |
| 4 | X-Axis |
Channel 5 & 6 are used as Z-Axis and RZ-Axis.
The remaining 6 channels are mapped to tri-state switches such that each switch sends 1100, 1500 or 1900. Those values are then mapped to 3 joystick buttons each that are pressed if the channel is in their value range:
B1 B2 B3
1100 1500 1900
\ | /
\ | /
\ | /
Channel 6
The Joystick.* and DynamicHID.* have been copied from the Arduino Joystick Library