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Auto Pilot for less than 100 bucks...

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Herbgh(at)nctc.com
Guest

Posted: Mon Mar 23, 2015 7:39 am Post subject: Auto Pilot for less than 100 bucks...

On another subject....



    spent my career in the computer business...Hardware and little 

software...too little software...for computer hardware is sold like 

candy bars...and the real emphasis is in programming..



    always interested in computers...built my first one in the 

1970's...Motorolla 6800 chip..running at a blazing 1 mhz...  1 k of 

memory...hot stuff!!!



    that said....I bought two credit card sized computers...one called 

Ardunio and the other is a Raspberry Pi... The Ardunio has had many 

additional plug "on" logic boards built for it...One of interest is 

called the 10DOF...It encompasses a three axis accelerometer.. three 

axis gyroscope.. a compass(magnetometer) and a barometer that can serve 

as an altimeter...  GPs boards are also available.



   I believe that many of the "so called" drones use a similar device 

that can be bought from hobby shops.. for a lot more money...the 10dof 

cost about 30 bucks...and Chinese clones(9DOF)  sell for 12 or so...The 

Ardunio knock off's sell for 8 bucks...I bought the Fundunio...  All 

to be found on Ebay.... Lots of canned software....and much info on You 

tube..and elsewhere..



   Pretty sure the C band satellite servo's , available from your 

neighbors yard for free would have enough power to operate trim tabs.. 

Or large hobby ones..for more money..



    wondering if anyone else has thought of trying one on a Kolb...with 

strong servo's on the trim tabs...it should be possible to fly long 

distances with minimal input...naturally, rough air would throw it 

off...and cause gyrations as happens on "real planes" with auto pilots 

..  Herb

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t41pilot

Joined: 05 Sep 2011
Posts: 38
Location: Howard City, Michigan

Posted: Mon Mar 23, 2015 12:02 pm Post subject: Re: Auto Pilot for less than 100 bucks...

Back when I was building my firefly, I thought of installing electric trim for an elevator tab. I did some research on RC servos and wind loads. I took worst case scenarios for a trim tab at 90 degrees to the airflow and found that sail winch servos for boats had more than enough torque to do the job. I came up with a circuit using a 555 timer and a bargraph to show position of the trim tab (assuming no mechanical failure of the linkage). I never installed the system though so have no actual flight data but in theory it could work.  Arduino already has sketches for servos and 10dof sensors since robots have become so prolific, so I'm sure if you put your mind to it, it could be done. I have used arduino circuits in my plane in other capacities such as strobe lights and capacitive fuel indicator with a bargraph. I'm just installing the arduino version fuel indicator now. My analog version worked just fine but I got bored over the winter and had to invent a new one with a larger, brighter display. My circuits for the plane as well as links to my Youtube videos can be found on my web page. 



  http://myplace.frontier.com/~t41pilot/index.html

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_________________
Gregg Kaat
2011 Firefly

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