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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/F7UC2SV5SESD4476WXUMSHZHTT5W74P4/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "F7UC2SV5SESD4476WXUMSHZHTT5W74P4",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/UV2Y5NQUNTLIJ2VYCVIPMOTE5FI4BVD5/?format=api",
    "sender": {
        "address": "8p6sm (a) anjo.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Gus",
    "subject": "[amsat-bb] Re: inquiry about homebrew az-el systems",
    "date": "2013-03-01T05:29:51Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/EY3UVSXMLYANNFLATQMHHP6SPFRUY4EJ/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7R32GK4IBTHCWYCTQMWTG74AVCXEH3C3/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "On 02/28/2013 11:24 PM, Lizeth Norman wrote:\n> A stepper still needs some sort of position feedback..\n>\n>\nNot really.\n\nSteppers rotate a predictable amount with each step.  To calibrate, the \nsoftware only needs to count steps from one limit switch to the other.  \nThen, by keeping track of step count (+/-), it will always know exactly \nhow far round the turn it is.  It can store last position in NV RAM or \nEEPROM, so as to avoid the need to recalibrate on every startup.\n\nUnfortunately, I can't think of a common source for surplus steppers of \nuseful size.  And driving them is slightly more complicated than firing \na relay to a DC motor.\n\n\nOK, why do we have to use A multi-turn pot?  Why not just an ordinary \nlinear pot?\n\n-- 73, de Gus 8P6SM\nBarbados, the easternmost isle.\n",
    "attachments": []
}