Email Detail
Show an email
GET /hyperkitty/api/list/[email protected]/email/WZEC3THMBFC3BO2W3NCE26XYJYXV7IVR/
{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/WZEC3THMBFC3BO2W3NCE26XYJYXV7IVR/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "[email protected]", "message_id_hash": "WZEC3THMBFC3BO2W3NCE26XYJYXV7IVR", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/MH5TBPK46SEOSBNTP2LYWFBPAMKQON6E/", "sender": { "address": "w5ggw (a) cox.net", "mailman_id": null, "emails": null }, "sender_name": "Gregg Wonderly", "subject": "[amsat-bb] Re: PIC rotator control", "date": "2009-10-13T16:32:34Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/MGUD7N3J3ACEJBRCVCZ4WXDHRSJQYKFJ/", "children": [ "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/J3RM7IUQ2K2PIXQQYUGYBHQ7ADDD6NAA/" ], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "I'd like to suggest that such systems should have a compass input from a GPS too \nso that as I'm driving mobile, I can have such a rotator strapped in the back of \nmy truck, and be able to have it track the pass so I can hear it, and grab the \nmic and talk if I need to. I'd also use this for mobile ATV work to keep a beam \npointed at our ATV repeater.\n\nGregg Wonderly\nW5GGW\n\nAlan VE4YZ wrote:\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 based\n> tracker box), to run a rotator control box, to run a rotator. Sure it works\n> but the absurdity of this really hits home when you disassemble your shack\n> to take it all out for Field Day or an EmComm exercise. I don't! I leave\n> the PC and LVBtracker at home and take my good old 1990's preprogrammed 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, 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 a\n> solution where the \"embedded system is the netbook\"? Then, all that would\n> be required between the PC and the rotator is a black box with relays to\n> power the rotators and a small A/D interface to take the data from the pots\n> and pass it onto the PC? A black box easily assembled by most hams. 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 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>> 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> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n> \n", "attachments": [] }