Headtracker setup on Turnigy 9XR
The following configuration was made with OpenTX firmware, version 2.1.9. Note that this is an example configuration and may be different on other setups.
To use Futaba trainer port in Turnigy 9XR a small modification may be necessary to enable the PPM-IN. In some 9XR versions it may be not connected to PCB as default. Check if it applies to your controller before you make any changes.
In 9XR the PPM-IN (trainer input) can be used by the JR port. The HT would also work if connected by this port but the problem is that the JR doesn’t support power. The solution is to connect the pointed below Signal Input pin of Futaba port to the PPM-IN of JR port with a short cable. After that 3 wires can be used: VCC, GND to power the HT, and PPM-Input to transmit the PPM signal from HT to the controller.
The trainer port has default configuration.
The pitch (up-down) is on trainter channel 7 (TR7) and yaw (left-right) is on trainer channel 8 (TR8). It was set on mixers CH6 and CH7. The switch ELE was uses to turn the Headtracker on and off. When the HT is off the MAX is active both for CH6 and CH7. When the ELE is on the mixer gets the PPM signal from trainer port.
The MAX setup positions the camera at fixed angle. The CH6 was moved to constant 50 that moves the camera up and CH7 was set to 6 that moves the camera slightly to the side to center initial position. This matches the initial (center) headtracker position equal with ELE switch off (fixed position) and on (HT active).
The CH6 and CH7 Weight is set to full scale 100. The minus sign is selected according to direction of rotation.
The Offset above (the initial servos position) was set to 0 because the true offset was set in HT Calibration Tool. 950us for pitch and 1170us for yaw angles takes the camera up and little to the side. Compare the values to the standard servo center which is 1200us (it is 1500us with 300us PPM pause).
To slow down the work of servos the „Slow Up” and „Slow Dn” can be set. This can be useful to reduce the wear of servos.
Optionally the Extended Limits can be enabled to increase the servo’s angle of inclination. When set for CH7 it allowes to see a little further to the left and right.