I found some very tiny and light adjustable step-down power modules which work very well for this application here:
They also come in fixed flavors and drive enough current to operate both SkyViper boards. I set one for 4 volts to power the boards. I used another for a 5 volt reference since my ESCs don’t include a BEC.
The 5 volt reference is used for this handy level shifter because my ESCs also don’t reliably work with the 2.8 volt PWM signal put out by the controller board.
As long as I’m here, a few other things I’ve learned and some pictures:
The 10 inch props on this old frame make a lot of vibration in the Z direction. Suspending the controller from the 3 mounting holes with elastic bands neatly solves the vibration problem for little additional weight.
Mount the GPS well away from the RF noise of the controller, camera and the fields of the motor and power wires. Don’t forget to do a full calibration of the sensors, including motor mag field calibration.
The foam over the pressure sensor is important.
Heat shrink tubing works well to stiffen the antennas (upper right of photo) if you want to point them up.
I extended the LED wires to place them (pointing down) under the motors.
I’m still working on a better way to mount the camera to avoid the nasty vibration on this large frame.
