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Cookwala / SDK und Szenarien / 021

Water boils lower at altitude: the same trace at sea level and at 1,500 m

Water and steam bands shift by minus 1 degC per 300 m. A reading of 97 degC is not a boil at sea level and is one in a mountain kitchen; a reading of 100 degC at 1,500 m is something a sensor should not see.

Zielgruppe: researcher · Ziel: Roboter für Menschen, Menschen gesünder machen · Level: beginner

Zuerst lesen: /docs/CORE/ /docs/QUICKSTART/

Schritte

  1. A pot that holds at 97 degC at sea level never reaches the 98 to 102 band. checkEnvelope

  2. The same readings at 1,500 m: the band is 93 to 97, and the pot is boiling. checkEnvelope

  3. A reading of 100 degC at 1,500 m is above the shifted band: water cannot be that hot there, so the sensor or the medium is in question. checkEnvelope

  4. At 2,400 m with a recipe target of 94 plus or minus 1: the target is checked inside the shifted band. checkEnvelope

Ergebnis

You can validate boiling and simmering traces from kitchens at any altitude, and you have a test for sensors that read what physics forbids. Next: scenario 022 checks hot oil.

Kommandozeile

printf '[{"t": 0, "tempC": 80}, {"t": 30, "tempC": 97}, {"t": 60, "tempC": 97}]' > trace.json && cookwala envelope cw.op.boil trace.json
printf '[{"t": 0, "tempC": 80}, {"t": 30, "tempC": 97}, {"t": 60, "tempC": 97}]' > trace.json && cookwala envelope cw.op.boil trace.json --altitude 1500
printf '[{"t": 0, "tempC": 80}, {"t": 30, "tempC": 100}, {"t": 60, "tempC": 100}]' > trace.json && cookwala envelope cw.op.boil trace.json --altitude 1500

Aufgezeichnete Ausgabe

Status: ok

[1] checkEnvelope: {"envelopeOk": false, "targetOk": null, "reason": "never_reached_envelope"}
[2] checkEnvelope: {"envelopeOk": true, "targetOk": null, "reason": "ok"}
[3] checkEnvelope: {"envelopeOk": false, "targetOk": null, "reason": "never_reached_envelope"}
[4] checkEnvelope: {"envelopeOk": true, "targetOk": true, "reason": "ok"}

Code

Ausführen: python scenarios/out/021-boiling-at-altitude/python.py

# Scenario 021: Water boils lower at altitude: the same trace at sea level and at 1,500 m
# Water and steam bands shift by minus 1 degC per 300 m. A reading of 97 degC is not a boil at sea level and is one in a mountain kitchen; a reading of 100 degC at 1,500 m is something a sensor should not see.
# Run a hub first: python hub/cookwala_hub.py --recipes examples
import json, os
from cookwala.client import CookwalaClient, CookwalaProblem

def load(path):
    with open(path, encoding="utf-8") as f:
        return json.load(f)

def pick(obj, path):
    for part in path.replace("]", "").replace("[", ".").split("."):
        obj = obj[int(part)] if part.isdigit() else (len(obj) if part == "length" else obj.get(part))
    return obj

c = CookwalaClient(os.environ.get("COOKWALA_HUB", "http://localhost:7878"))


# Step 1: A pot that holds at 97 degC at sea level never reaches the 98 to 102 band.
seaLevel = c.check_envelope("cw.op.boil", [{"t": 0, "tempC": 80}, {"t": 60, "tempC": 97}, {"t": 120, "tempC": 97}])
assert pick(seaLevel, "envelopeOk") == False, pick(seaLevel, "envelopeOk")
print("ok", "envelopeOk", "=", False)
assert pick(seaLevel, "reason") == "never_reached_envelope", pick(seaLevel, "reason")
print("ok", "reason", "=", "never_reached_envelope")

# Step 2: The same readings at 1,500 m: the band is 93 to 97, and the pot is boiling.
mountain = c.check_envelope("cw.op.boil", [{"t": 0, "tempC": 80}, {"t": 60, "tempC": 97}, {"t": 120, "tempC": 97}], None, 1500)
assert pick(mountain, "envelopeOk") == True, pick(mountain, "envelopeOk")
print("ok", "envelopeOk", "=", True)
assert pick(mountain, "reason") == "ok", pick(mountain, "reason")
print("ok", "reason", "=", "ok")

# Step 3: A reading of 100 degC at 1,500 m is above the shifted band: water cannot be that hot there, so the sensor or the medium is in question.
tooHot = c.check_envelope("cw.op.boil", [{"t": 0, "tempC": 80}, {"t": 60, "tempC": 100}, {"t": 120, "tempC": 100}], None, 1500)
assert pick(tooHot, "envelopeOk") == False, pick(tooHot, "envelopeOk")
print("ok", "envelopeOk", "=", False)
assert pick(tooHot, "reason") == "never_reached_envelope", pick(tooHot, "reason")
print("ok", "reason", "=", "never_reached_envelope")

# Step 4: At 2,400 m with a recipe target of 94 plus or minus 1: the target is checked inside the shifted band.
highTarget = c.check_envelope("cw.op.boil", [{"t": 0, "tempC": 95}, {"t": 60, "tempC": 94}], {"value": 94, "tolerance": 1}, 2400)
assert pick(highTarget, "envelopeOk") == True, pick(highTarget, "envelopeOk")
print("ok", "envelopeOk", "=", True)
assert pick(highTarget, "targetOk") == True, pick(highTarget, "targetOk")
print("ok", "targetOk", "=", True)
assert pick(highTarget, "reason") == "ok", pick(highTarget, "reason")
print("ok", "reason", "=", "ok")

print("scenario complete")

scenarios/021-boiling-at-altitude.json

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