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GET /hyperkitty/api/list/[email protected]/email/YHRA7PJUARESFZSMNWOYEAKSGSOUFJK2/
{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/YHRA7PJUARESFZSMNWOYEAKSGSOUFJK2/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "008901ca4ca8$64bd6170$2e382450$@be", "message_id_hash": "YHRA7PJUARESFZSMNWOYEAKSGSOUFJK2", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/MH5TBPK46SEOSBNTP2LYWFBPAMKQON6E/", "sender": { "address": "amvm (a) skynet.be", "mailman_id": "340c1832ff0445bf8868c926b32e84a5", "emails": "https://mailman.amsat.org/hyperkitty/api/sender/340c1832ff0445bf8868c926b32e84a5/emails/" }, "sender_name": "Marc Vermeersch", "subject": "[amsat-bb] Re: PIC rotator control", "date": "2009-10-14T08:29:05Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/MGUD7N3J3ACEJBRCVCZ4WXDHRSJQYKFJ/", "children": [], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "Hi Alan,\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 Yeasy\n> > control box.\n\nMy setup is NOT using the rotator control box; it drives the rotator\ndirectly.\n\n> > - Eventually I want to run a tracking algorithm in the PIC too\n\nIn the future I plan to run a tracking algorithm on the embedded processor\nto become independent from the PC.\n\nThat would result in a autonomous box for on-the-road activity. Add a GPS\nand a compass and you can install it on a truck.\n\nI'm currently also experimenting with solid state AZ/EL measurement. Final\ngoal is to stick a small box on the handle of an arrow antenna and get\nUp/Down and Left/Right indication by LED's.\n\nBR,\n--\n/\\/\\arc\n\n\n\n> -----Original Message-----\n> From: Alan VE4YZ [mailto:[email protected]]\n> Sent: dinsdag 13 oktober 2009 17:35\n> To: 'Marc Vermeersch'; 'Andrew Rich'; [email protected]\n> Subject: RE: [amsat-bb] Re: PIC rotator control\n> \n> Marc, Andrew and the group...\n> \n> It has always struck me as being odd that we use a PC to run a PC(PIC\n> based\n> tracker box), to run a rotator control box, to run a rotator. Sure it\n> works\n> but the absurdity of this really hits home when you disassemble your\n> shack\n> to take it all out for Field Day or an EmComm exercise. I don't! I\n> leave\n> the PC and LVBtracker at home and take my good old 1990's preprogrammed\n> PIC\n> based TrakBox that does 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 controller,\n> not the\n> 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 not\n> a\n> solution where the \"embedded system is the netbook\"? Then, all that\n> would\n> be required between the PC and the rotator is a black box with relays\n> to\n> power the rotators and a small A/D interface to take the data from the\n> pots\n> and pass it onto the PC? A black box easily assembled by most hams.\n> If\n> open source, then others can do whatever is necessary create mods for\n> various rotator systems such as pulse counting for stepper motors\n> instead of\n> 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 Yeasy\n> > control box.\n> >\n> > The PC sends information to the PIC (RequestedAZ,RequestedEL)\n> > and the 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 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\n> > seconds -or- an explicit park command is received\n> > - Stall protection\n> > - Some horizon protection: EL cannot go below x when AZ is y\n> > to avoid 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 doing\n> > all that 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 safety\n> > related 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> > _______________________________________________\n> > Sent via [email protected]. Opinions expressed are those of\n> > 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", "attachments": [] }