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Oyvind Amundsen's Blog (14)

MiniQuad where i Plan to combine carbon tubes and 3d printed parts

I have been working on a new miniquad project where I did plan to use VRBrain controller, but now I must redesign it for the new VR Micro Brain :-)

I plan to use:

- 16mm carbon tubes (so I can mount ESC inside the tubes)

- 20A Slim Afro ESC

- SunnySky 2204s 2300Kv motors

- HQ Prop 6x3 Carbon Composit Props (some info on the motor/prop combo)

- VR Micro Brain :-)  + GPS +…


Added by Oyvind Amundsen on April 25, 2014 at 3:30pm — 2 Comments

CTX4 V2 - first test

Today I did the first test with my new CTX4 V2 (VRBrain 4.5 + external IMU)

Did some simple test in my garden + alt hold, loter and auto land - no probles, and wery stable.

My great VRBrain controller is running code from today (10.10.2013)  (used Eclipse to pull and build the latest code from Emilie, that does an impressive…


Added by Oyvind Amundsen on October 10, 2013 at 9:29pm — No Comments

CTX4 V2 build - step 2

Almost done :-)

I do not use bullet connectors on the ESC to motor cables, so I connect the cables like this while testing.

First, I test if the rotation directions are correct, by connecting the “servo” cable to the throttle channel on my rx. If the rotation direction is wrong, I swap two of the three cables between ESC and motor.

My ESC`s are flashed with SimonK, so before I disconnect the RX, I calibrate the ESC. Disconnect LiPo,…


Added by Oyvind Amundsen on October 7, 2013 at 7:00pm — 1 Comment

CX4M (VRBRAIN mini quad) - cad drawings finished

To better test if the design is ok, I made a simple VRBRAIN cad model to mount in my frame.

I found that I had to do some changes to fit the controller.

In this image I have used 10mm spacers between the center plates - I may test other lengths -…


Added by Oyvind Amundsen on September 29, 2013 at 9:00pm — 1 Comment

CTX4 V2 build - step 1


Have mounted a power board + 6 30mm alu standoffs + 4 tube clamps (from

On the top center plate (at right) I have mounted 6 spacers with vibration damping.


ESC mounted to the side plates with the motor…


Added by Oyvind Amundsen on September 27, 2013 at 8:53pm — 1 Comment

CTX4 V2 (parts arrived) + new project CX4M (mini)

While waiting on the CTX4 V2 CNC work to be done, I have started a new project CX4M  (a mini quad). I have finished the CX4M design. Next step is to get someone to do the CNC part (1,5mm carbone). The CTX4 V2 parts have arrived, so I can start working on that frame while…


Added by Oyvind Amundsen on September 27, 2013 at 9:00am — No Comments

New smart product from HobbyKing - Telemetry Radio Cases

Great Product if you use 3DR type telemetry radio modules

Buddy price code:…


Added by Oyvind Amundsen on August 31, 2013 at 8:24am — No Comments

My new CTX4 V2 frame

Inspired by Robertos "open top" frame I have modified my CTX4 frame design to get open top and top mounted LiPo CTX4 V2


Some Pictures created using SketchUp

The frame uses 16mm carbon tubes and tube clamps from…


Added by Oyvind Amundsen on August 20, 2013 at 12:00am — 3 Comments

Testing 3.0.4 code (built using Eclipse 06.aug 13) on my CTX4 quad

In the video I tested Loiter mode

Tested normal manual flight, alt hold, loiter and land - all Works fine

Alt hold and Loiter was impressive

In this test I used PPMSUM from my RX module



Added by Oyvind Amundsen on August 7, 2013 at 11:34pm — 1 Comment

How I turned my Futaba T10 radio into a pro level telemetry radio

Earlier my plan was to mount my Galaxy Nexus 7» tablet on my radio, but I decided that the Nexus7 is too large and heavy for this.

Therefore, I decided to use my Samsun Galaxy S III phone in this project. I have used the same type of back cover so it is simple to add/remove the phone on the radio.

On the back of the Galaxy S III back cover, I have…


Added by Oyvind Amundsen on May 11, 2013 at 7:30pm — 1 Comment

Testing my quad using VRBRAIN + LEA-6 GPS

After a long time with wind, rain and snow, the weather turned in my favor, so I was able to test my frame using my great VRBRAIN + LEA-6 GPS.

The quad feels very responsive and stable (using the latest firmware). Tested standard mode, simple mode, alt hold, loiter and auto land – all without any problems.

Did not have…


Added by Oyvind Amundsen on May 8, 2013 at 12:00pm — 5 Comments

VrDroidRC Building Log (portable radio tx control with integrated ground station)

I´m going to start testing Roberto´s New VrDroidRC Android app.

To have a platform where I can use my Nexus 7 tablet as a combined Ground Station and radio (using AndroPilot or VrDroidRC), I have made a combined Nexus 7 dock and enclosure to mount the electronics.

 Maybe later VrDroidRC have telemetry and FPV support, so I don´t have to use AndroPilot ?

Here I have mounted a G10 plate and some 30mm standoffs on the back of a Nexus 7 protective back-cover…


Added by Oyvind Amundsen on March 17, 2013 at 9:28pm — No Comments

Nexus 7 (Andropilot) radio "docking"

My new telemetry project.

My plan is to use these items to make an Nexus 7 telemetry radio docking:…


Added by Oyvind Amundsen on February 22, 2013 at 8:39pm — No Comments

Andropilot - Android ground controller

Some more information on my setup to test the Andropilot app using VRBRAIN



In my test, I use:

- My great VRBRAIN Controller running the latest 2.9 firmware

- 3DR Radio Telemetry Kit - 433Mhz



Added by Oyvind Amundsen on February 8, 2013 at 11:09pm — 10 Comments


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