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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/J3RM7IUQ2K2PIXQQYUGYBHQ7ADDD6NAA/?format=api", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api", "message_id": "3AE6F874E5314BA49FD9E3A85B9BB8AF@Athlon", "message_id_hash": "J3RM7IUQ2K2PIXQQYUGYBHQ7ADDD6NAA", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/MH5TBPK46SEOSBNTP2LYWFBPAMKQON6E/?format=api", "sender": { "address": "ve4yz (a) mts.net", "mailman_id": null, "emails": null }, "sender_name": "Alan VE4YZ", "subject": "[amsat-bb] Re: PIC rotator control", "date": "2009-10-13T17:08:29Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/WZEC3THMBFC3BO2W3NCE26XYJYXV7IVR/?format=api", "children": [ "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/P7JBZH7IHZKP5ZZCLAVFQWPS3IUDDQVK/?format=api" ], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "Nice idea Gregg. We do a few near space balloons each year and I have been\nbugging some other folks ( because I don't write code ) to consider 2\nprojects:\n\n1 - rotator control in a moving vehicle to keep a small yagi such as an\nArrow pointed at the APRS signal.\n\n2 - antenna parking based on data from a home WX station such as those\ncommonly beaconing on APRS systems. \n\nI will copy the 3 of you, Marc, Andrew and Gregg off list with more details.\n\n\n\n> -----Original Message-----\n> From: Gregg Wonderly [mailto:[email protected]] \n> Sent: October 13, 2009 11:33 AM\n> To: Alan VE4YZ\n> Cc: 'Marc Vermeersch'; 'Andrew Rich'; [email protected]\n> Subject: Re: [amsat-bb] Re: PIC rotator control\n> \n> I'd like to suggest that such systems should have a compass \n> input from a GPS too so that as I'm driving mobile, I can \n> have such a rotator strapped in the back of my truck, and be \n> able to have it track the pass so I can hear it, and grab the \n> mic and talk if I need to. I'd also use this for mobile ATV \n> work to keep a beam pointed at our ATV repeater.\n> \n> Gregg Wonderly\n> W5GGW\n> \n> Alan VE4YZ wrote:\n> > Marc, Andrew and the group... \n> > \n> > It has always struck me as being odd that we use a PC to \n> run a PC(PIC \n> > based tracker box), to run a rotator control box, to run a \n> rotator. \n> > Sure it works but the absurdity of this really hits home when you \n> > disassemble your shack to take it all out for Field Day or \n> an EmComm \n> > exercise. I don't! I leave the PC and LVBtracker at home \n> and take my \n> > good old 1990's preprogrammed PIC based TrakBox that does \n> the radio and rotators.\n> > \n> > http://www.tapr.org/kits_trakbox.html\n> > \n> > http://picasaweb.google.com/ve4yz.alan/TrakboxRebuild2004#\n> > \n> > As I read you comments you are both querying the rotator \n> controller, \n> > not the rotators, to find out where the AL and EL are.\n> > \n> > With the power of today's inexpensive netbooks or the OLPC is there \n> > not a solution where the \"embedded system is the netbook\"? \n> Then, all \n> > that would be required between the PC and the rotator is a \n> black box \n> > with relays to power the rotators and a small A/D interface to take \n> > the data from the pots and pass it onto the PC? A black box easily \n> > assembled by most hams. If open source, then others can do \n> whatever \n> > is necessary create mods for various rotator systems such as pulse \n> > counting for stepper motors instead of A/D etc\n> > \n> > My 2 cents.... Alan\n> > \n> > \n> > \n> >> -----Original Message-----\n> >> From: [email protected]\n> >> [mailto:[email protected]] On Behalf Of Marc Vermeersch\n> >> Sent: October 13, 2009 6:45 AM\n> >> To: 'Andrew Rich'; [email protected]\n> >> Subject: [amsat-bb] Re: PIC rotator control\n> >>\n> >> Hi Andrew,\n> >>\n> >> I have a PIC based solution currently in the prototype stage. \n> >> It uses a\n> >> PIC18F4455 and drives a Yeasu AZ/EL rotor without the \n> Yeasy control \n> >> box.\n> >>\n> >> The PC sends information to the PIC \n> (RequestedAZ,RequestedEL) and the \n> >> PIC sends back status information to the PC \n> >> (RequestedAZ,RequestedEL,CurrentAZ,CurrentEL,Status).\n> >>\n> >> Everything is done by the PIC:\n> >> - Control of the rotor motors based on either \n> move-every-n-seconds or \n> >> move-when-error-angle-is-greater-than-n\n> >> - Measurement of the actual AZ/EL with 10-bit resolution\n> >> - Parking when no signal has been coming from the PC in x seconds \n> >> -or- an explicit park command is received\n> >> - Stall protection\n> >> - Some horizon protection: EL cannot go below x when AZ is \n> y to avoid \n> >> pointing into my neighbors' bedroom.\n> >> - Over the top rotor control (under development)\n> >> - ...\n> >>\n> >> I'm using a PIC18F4455 and it is very well capable of \n> doing all that \n> >> and more. I have chosen this path for several reasons:\n> >> - Eventually I want to run a tracking algorithm in the PIC too\n> >> - To make the control loop shorter\n> >> - To avoid dependence on the PC part specifically on \n> safety related \n> >> aspects like stall control and horizon protection.\n> >> - To explore the capabilities of the PIC18\n> >> - (Because it's my job to do embedded HW/SW)\n> >>\n> >> BR,\n> >> --\n> >> /\\/\\arc\n> >>\n> >>> -----Original Message-----\n> >>> From: [email protected]\n> >> [mailto:[email protected]]\n> >>> On Behalf Of Andrew Rich\n> >>> Sent: dinsdag 13 oktober 2009 12:22\n> >>> To: [email protected]\n> >>> Subject: [amsat-bb] PIC rotator control\n> >>>\n> >>> Hello\n> >>>\n> >>> I am re-visting a rotator controller.\n> >>>\n> >>> I am curious, should I push the processing of the \"compare\n> >> and make a\n> >>> decision\" onto the PIC, or pull that function back into the PC ?\n> >>>\n> >>> PC is LINUX\n> >>>\n> >>> I/O is serial\n> >>>\n> >>> PIC is 16F877\n> >>>\n> >>> Andrew VK4TEC\n> >>>\n> >>> _______________________________________________\n> >>> Sent via [email protected]. Opinions expressed are those of the \n> >>> author.\n> >>> Not an AMSAT-NA member? Join now to support the amateur satellite \n> >>> program!\n> >>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n> >> _______________________________________________\n> >> Sent via [email protected]. Opinions expressed are those of the \n> >> author.\n> >> Not an AMSAT-NA member? Join now to support the amateur satellite \n> >> program!\n> >> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n> >>\n> > \n> > _______________________________________________\n> > Sent via [email protected]. Opinions expressed are those \n> of the author.\n> > Not an AMSAT-NA member? Join now to support the amateur \n> satellite program!\n> > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n> > \n> \n\n", "attachments": [] }