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radiohound

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About radiohound

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  1. Well, it looks like I am about 6 years late, but here is a project that does just that. MikeP originally wrote some of the base autopilot code, and I added the internal navigation code, etc. It does it on a PIC16F, and can keep up with GMRC on a 5 hertz GPS. Parsing is done with PicBasic, and the navigation math is done with assembly. Having trouble parsing an additional sentence at that speed though. http://www.rcgroups.com/forums/showthread.php?t=993046
  2. After some testing of the navigation code I had (a more accurate version of 18beta). I found a couple things. It was pretty accurate (within about two or three degrees 95% of the time). But there were some areas that confused my approximation routine. Some of these areas could be off by as much as 18 degrees. This bugged me enough to buy a C assembler program, which can do higher math, but it turns out I don't think I need to use it. I have found an application note that describes how to perform trig on a PIC16 device. It uses a cordic formula to determine the angle to a waypoint! This is f
  3. Probably not an issue for anyone, but it looks like some of the early EB-85A firmware had a default of 4800 baud. New firmware update give you a default of 38400 baud. It still says default baud is 4800 in the manual. Great little GPS though. I get a super quick lock inside my house (warm boot wise).
  4. The program that I posted compensates for the changes in the length of longitude as your Latitude changes, in an admittedly crude way.... See page 2 of the pdf for the paragraph starting with "But wait!" A quick look at the Haversine equations make it look a bit difficult to perform (at least for me) in PicBasic code. That was the reason I approximate the answer in the above code. Also the reason the little pic chip can compute it at 1,000 times per second.
  5. If anyone is interested, I have some code working for waypoint navigation inside a PIC chip (rather than relying on the gps for waypoint route calculation). It calculates distance and direction to the waypoint and steers a servo to direct your plane to that location. To make it work on a Pic chip with PicBasic, I had to simplify the math involved. I wrote an explanation of the math if anyone is interested, here is the pdf file. http://www.uavs.net/Waypoint-Math.pdf . Here is the waypoint navigation code. http://www.uavs.net/18beta.zip . It is written for the RCAP2 or RCAP hardware. A desc
  6. Ok, but it looks like 6 I/O are needed for signal and control of it. I guess with 33 I/o pins, I did not think they were lacking in I/O, but I guess you can never have enough. Thanks for the help. Walter
  7. I started looking into the hardware for the FMA Copilot FS8. Its core is a PIC16LF877A -I/PT and it is connected to a Phillips HEF4015BT dual 4 bit static shift register which goes to the servo signal side of the pins. http://www.semiconductors.philips.com/acro...4015B_CNV_3.pdf My question is, what do you think the purpose/bennefit of the shift register (serial to parallel converter) is? Thanks, Walter
  8. Pista, I just got a report from a customer that the pots are not working for them. I will look into this further. It worked for me in debug mode, now I will need to do a compare of the programs, and see what could be happening. I will look into it futher. If a reprogram is required to get the pots working, I will provide a new programmed chip for free to those that purchassed the RCAP2. Walter
  9. Pista, I am a little surprised that the max232cpe works with what I assume are .1uf capacitors. Its specifcations say it should be connected to 10uF caps. The Max232acpe is the one that can use .1uF caps. But that part is working for you.
  10. Hello Pista, Good to hear from you. It sounds like your biggest complaint was at final destination waypoint, and the random turns it would make holding there. Some of the random turns could be reduced by using more of a trainer style model. An acrobatic plane is not recommended by the original author. Although you have a large acrobatic plane, this could be part of the problem. It is meant for a trainer, high wing type aircraft. Another help would be to limit the throw of your servo by changing the gain setting and travel (if they were working). This would round out all your autopilot t
  11. Gain and Travel are working for me. I can see the servo travel furthest when the pot is set counter-clockwise, and minimally when the pot is turned clockwise. I can also see the values change coming out the debug port in debug mode (have to program chip in debug, as oposed to using main.hex). Here is what I get when I am in debug, with autopilot switched on: !$GPRMB,V,0.00,L,,001,3700.356,N,12134.960,W,0.643,180.5,-20.0,A,S*76 !===DoCS: !cs=118 gpscs=118 !$GPRMC,045034,V,3701.0202,N,12134.9525,W,20.0,0.4,230206,14.8,E,S*0F !===DoCS: !cs=15 gpscs=15 !===Correct: !Center : 1
  12. The company name has changed and it is now Scale Robotics Inc. Store front can be found here: www.scalerobotics.com/store/catalog
  13. Thanks for the interest Dan. Glad to have any extra business. Thanks! I never keep many pre-buit. I just build them as needed. I've got more circuit boards, and have another batch of parts on its way. The original RCAP (firmware on PIC) was written by Michael P, and this PCB board was based on his design. For more info on the original RCAP see http://rcpilot.sourceforge.net/modules/rcap/index.php . I have added some ports for extra servo's or a/d conversion, however, I have not written any extra code for these. Hopefully these boards and kits make it easier for people to experiment with the
  14. Yes, I have some pre-built units for sale. I am in the middle of switching web sites, but you should be able to order it at www.scalerobotics.com/store/catalog More information can be found at: www.uavs.net
  15. Here is one more airspeed indicator with pic basic pro code: http://www.steveonweb.com/index.php?id=29,0,0,1,0,0 If that link does not work, you can get to it from here with a bit of navigation: http://www.steveonweb.com
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