Monday, November 26, 2012

To Fly A Quadrotor Into The Treetops.



    This is 4th time fly test, I did some code and parameter tuning. Bad results, I fly a quadrotor into the treetops. Jammed height is a bit too high. When I'm in trouble that how to get it back. Little boy gave me a long bamboo. I use bamboo to got it down carefully. Fortunately because treetops buffer, just only a little damage for propeller.
    I just want to deal with this, didn't take a picture. Picture is after back home.

Er9x, FrSKY and MultiWii Telemetry Sensor Integrate.

Used resources on the network, I integrate the sensor output show on my R/C transmitter. Thanks for the resources provided by the parties.

Target's battery voltage and RSSI show on my R/C transmitter, and it had function to set alerm for low voltage and low RSSI. I didn't need any more low voltage detector.

Target's latitude and longitude and altitude show on my R/C transmitter. It's useful for check that GPS is lock or not. Don't need check laptop or LED from control board.

Thursday, November 15, 2012

Landing Gear Repair.

    Used the landing gear for 450 size helicopter to swap original.

Monday, November 12, 2012

FrSKY D8R-II Plus Firmware Upgrade To D8R-XP With CPPM 27ms.


My receiver is FrSKY D8R-II plus.
Today, I uploaded the firmware to D8R-XP.
(I search from internet. D8R-II plus & D8R-XP hardware they look like the same.)
Why would I want to do this?
That has several advantages.
First, I want to use CPPM between receiver and control board, only one cable transfer CH1~CH8 signal.
Second, I can got RSSI for signal level.

Because the FrSKY had some issue on CPPM mode, in this reason, I suggest don’t use more then 6 channel on CPPM mode.
You can see D8R-XP user manual on FrSKY website, the user manual say “CPPM channel can not handle all eight channels at the same time with all throws are maxed out, as it does not have enough frame gap. It is recommended to use at most six channels from CPPM channel while leaving off the rest two channels, otherwise improper performance might occur.”.

And you can look into the following URL.

FrSKY release firmware (beta version) that CPPM 27ms for D8R-XP to fix this issue.
Beta version firmware on FrSKY website, include upload procedure.
I use this way (see following URL) to uploaded firmware.

I use USB to TTL element, FTDI chip, work very well.

Sunday, November 4, 2012

My Quadrotor Helicopter.



    This is my 400mm size quadrotor helicopter. Due to the still testing, the wire had no arrange and no cut out.

    I had manual control R/C helicopter only once experience many years ago. I think is difficult for me. I use firmware MulitWii 2.1 in my quadrotor, all parameters default setting. MulitWii default setting well done, In addition to the slight oscillates in the wind for my quadrotor.

    I flew three times this holiday season, is a thrilling flown! I could control in a simple environment gradually, but landing.

    Because of my lack and this frame too fragile. the landing gear broken down.

    During three times flying, only landing gear broken, is good news for me and good news for my money. I will use landing gear of 450 size helicopter replace it.

Thursday, November 1, 2012

Flashing Turnigy 9x Firmware With Er9x and FrSKY Two Way Telemetry System Mods.



    The open source project "er9x" is very powerful and flexible firmware for Eurgle/FlySky/Imax/Turnigy 9x R/C transmitter. We can do some modify to flashing er9x in R/C Transmitter. I bay the Turnigy 9x from internet.


    And open this transmitter.



    Choose somewhere to place connector in order link to AVR ISP programmer.
AVR ISP connector is 10 pin or 6 pin. I hope this connector is strong enough in structure, may pass through several plug in and plug out. So I have in mind this method of fixed. The com port cable use in PC with motherboard, and is 10 pin connector exactly in line with AVR ISP port.(One line connected to case, but it's OK)


    Start dibble.

    Make connector.

    Install connector.


    EL back light module.

    Add EL back light board for LCD.

    Tow way telemetry module.

    Install module on Transmitter. Start dibble and pass through cable from two way telemetry.

    Tie a knot in the back of the prevention of shedding.

     “Receiver Upgrade Lite” for rs232 level transfer.

    Being long time soldering.
  
    Try flashing er9x to transmitter.

    Boot and check EL back light.
     Enjoy and learn how to use the powerful transmitter.