All-In-One (AIO) OpenHD RC-Control system

The idea was to build a dedicated OpenHD transmitter that would rule all aspects of a modern & sophisticated GCS.

Basically it should be an AIO solution that would display the HD-Video right away on an integrated display, show telemetry data in a way the user is used to it and allow for RC-Control over MAVlink.

Additionally, it should offer a variety of expansion ports such as HDMI and USB. Also the Micro-SD card should easily be accessible.

Furthermore, the new experiences in relation to suitable high power WiFi adapters should be taken into account to allow for mind boggling long range flights. Last but not least ergonomics and clean and stylish design were added to the requirements list.

Hardware used:

More pictures:

I ran into some problems during the build that i want to share with you:

  1. The GeeekPi USB Joystick controller turned out to be very sensitive to RF-interference. While the 6 analogue inputs (AXIS) are protected with pull-down resistors the digital inputs (BUTTONS) are not. #cheap chinese manufacturing. This caused all sorts of issues because an aweful lot of jitter was introduced into the system. Having a high-power WiFi-adapter nearby did certainly not help either. This issue was solved by adding 2,2kOhm pull-down resistors to each and every digital input as well.

  1. While [1] helped a lot to get rid of the jitter this mitigation somehow did not work for the 4 digital input channels SE ST K11 K12. Since I don’t use them anyway i deceided to short them out with a jumper on each input. This way I completely got rid of the jitter problem.

  1. Additional to the jitter issue I discovered that there was some sort of an interrupt problem that showed up when using the GeeekPi board. The problem would manifest in such a way that the GeeekPi would show a joystick AXIS event even though non of the axis was moved. It would then read a number of empty registers (empty because there was no actual value from its ADCs - because there was no motion). This resulted in extrema values for the affected axis (e.g the Throttle setpoint was 0 but it would suddenly jump to -32676 for a split second). This interupt problem gets worse the more USB devices are added to the GroundPi. You can read more about the issue and how it was mitigated/solved here and here.
    With these changes [1-3] the Transmitter is now working perfectly.

Even after seeing this for the nth time. It still amazes me. The craftsmanship in this is really an example. I have said it before and I will say it again: beautiful work!

1 Like

I am totally amazed by the beauty.
Is there a video showing how you built it?
That is one of the most beautiful DIY projects I have seen.
By the way, from where did you get the housing for the RC?

Thank you very much for your warm words. Sadly there is no video showing the build process since it was build over the course of about 3 month or so. The housing is all DIY made from carbon fiber plate and tube material .

I would like to buy all the parts that you listed.
Will you be able to instruct me on the main steps I need to take?
I really want to build something similar to yours. I really loved it!