Comment by Andy Geppert on December 17, 2009 at 12:22pm

No problem. What is your day job, if I may ask?

Comment by Andy Geppert on December 17, 2009 at 1:38pm

Bryan, back to the hot-wire, what voltage/current are you running for a 30 inch wing panel?

Comment by Bryan Cuervo on December 17, 2009 at 3:20pm

I work for a small, high tech, R&D company that develops mainly USV's. You got me on the power I use. I've never measured it, but go by how easily the wire cuts through a scrap piece of foam. That way, it's independent of wire length, wire gauge and material. If you hear a sizzle and the wire cuts like a hot knife through butter without even having to apply force, it's too hot. If it cuts (with force applied) slower than about 0.5 in/sec, it’s too cold. Sorry about the qualitative answer.

Comment by UFO-MAN on December 18, 2009 at 9:42am

Hi, I have posted my PWM "code" and the "schematic" for a wire cutter PWM controller i banged together under my blog in case anyone is interested in duplicating it. Basically its an Arduino with a FET. The FET is controlled by a PWM output. It will give you precise control of power with an analog input (e.g. a potmeter to control the power). It can also be modded to accept RS232 commands.

UFO_MAN

Comment by Andy Geppert on December 18, 2009 at 10:23am

Cool! Thanks UFO_MAN.

Comment by sid on February 10, 2010 at 11:13am

Hi Bryan ,
I am having trouble with setting up UDB in my wing.. Can you please shed some light ,,THe details are below..
I have setup UDB on my new platform (Wing)..It’s a 36” tail less foam wing. I am facing below issue. Anyone who has already ventured into this setup. I know Bryan has done a lot in this and I hope this email reaches him too. I have attached my option.h file to review. I am using old R141..Below are other details.



Tx-Rx :- Futaba 9Cap + R129 DP Rx.



Ch1 Rx as aileron goes to ch 1 input to UDB

Ch2 Rx as Elevator.. goes to ch 2 input to UDB

Ch3 is direct to ESC…

Ch6 Rx goes to CH4 input to UDB



Tx programmed as Elevons.. All controls works perfect..



Manual flight is ok with the UDB setup, everything trimmed and ok..



If I put the UDB in stab mode (after a GPS lock and a WAG) on the ground.. and if I do the test by tilting the aircraft , the controls behaves as it should.. Nose down , both the control surfaces go up , nose up they goes down.. If I tilt the aircraft on left (viewing from the cockpit) right aileron goes up-left goes down and if I tilt the aircraft on right the left aileron goes up-right goes down..



SO I think the config and connections are proper.



Now the issue is , after I takeoff in manual mode , I put the aircraft in stab mode (after doing some circles to achieve a yaw lock) the aircraft suddenly banks either on the left or right.. It’s uncertain. and eventually enters in to a roll and then dive..I tried initializing the same keeping the aircraft on a perfect level-motion less couple of times.. Reduced gains a lot but it still happens..



I also tried putting the aircraft in stab mode with motor off just to eliminate the possibility of vibrations causing this but it’s the same.



Just a note , I am using EM406 on this one since I have only one Ublox.



Anyone who can flash something am I missing ? or doing wrong..
My option.h file is attached..

Regards
SID options.h

Comment

• ‹ Previous
• 1
• …
• 10
• 11
• 12
• Next ›
• Page