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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/SKNUNOARTBMEQRE7XO5NMSHTLCSYRXR4/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "006e01ca4bfa$8a3f9390$9ebebab0$@be",
    "message_id_hash": "SKNUNOARTBMEQRE7XO5NMSHTLCSYRXR4",
    "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": "2009-10-13T11:44:36Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/MH5TBPK46SEOSBNTP2LYWFBPAMKQON6E/",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/PNVI3J243Y7MIZZR23AXBGLCJSH7NFLL/",
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/MGUD7N3J3ACEJBRCVCZ4WXDHRSJQYKFJ/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi Andrew,\n\nI have a PIC based solution currently in the prototype stage. It uses a\nPIC18F4455 and drives a Yeasu AZ/EL rotor without the Yeasy control box. \n\nThe PC sends information to the PIC (RequestedAZ,RequestedEL) and the PIC\nsends back status information to the PC\n(RequestedAZ,RequestedEL,CurrentAZ,CurrentEL,Status). \n\nEverything is done by the PIC:\n- Control of the rotor motors based on either move-every-n-seconds or\nmove-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 -or- an\nexplicit park command is received\n- Stall protection\n- Some horizon protection: EL cannot go below x when AZ is y to avoid\npointing into my neighbors' bedroom.\n- Over the top rotor control (under development)\n- ...\n\nI'm using a PIC18F4455 and it is very well capable of doing all that and\nmore. 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 related aspects\nlike 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\nBR,\n--\n/\\/\\arc\n\n> -----Original Message-----\n> From: [email protected] [mailto:[email protected]] On\n> 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 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",
    "attachments": []
}