{ "metadata": { "title": "Raspberry Pi Environmental Monitoring: Grades 6-12", "description": "A learning graph for an intelligent textbook in which students in grades 6-12 build a Raspberry Pi environmental monitoring station. The primary goal is to understand what is being measured in the natural environment - temperature, barometric pressure, humidity, solar radiation, wind speed, ground motion, and location - and how those measurements affect the natural and man-made environments. The graph covers the history, physics, units, and instruments of each measurement, together with the hardware, Linux, Python, data logging, analysis, and field deployment skills needed to take the readings.", "creator": "Hank R.", "date": "2026-08-25", "version": "1.0", "format": "Learning Graph JSON v1.0", "schema": "https://raw.githubusercontent.com/dmccreary/learning-graphs/refs/heads/main/src/schema/learning-graph-schema.json", "license": "CC BY-NC-SA 4.0 DEED" }, "groups": { "FOUND": { "classifierName": "Measurement Foundations", "color": "SteelBlue", "font": { "color": "white" } }, "SENSE": { "classifierName": "Sensors And Transduction", "color": "DarkSlateBlue", "font": { "color": "white" } }, "ATMOS": { "classifierName": "Atmospheric Science", "color": "DarkGreen", "font": { "color": "white" } }, "TEMP": { "classifierName": "Temperature", "color": "LimeGreen", "font": { "color": "black" } }, "PRESS": { "classifierName": "Barometric Pressure", "color": "Gold", "font": { "color": "black" } }, "HUMID": { "classifierName": "Humidity And Dew Point", "color": "DarkGoldenrod", "font": { "color": "white" } }, "SOLAR": { "classifierName": "Solar Radiation", "color": "Khaki", "font": { "color": "black" } }, "WIND": { "classifierName": "Wind", "color": "Teal", "font": { "color": "white" } }, "SEIS": { "classifierName": "Ground Motion And Seismology", "color": "DodgerBlue", "font": { "color": "white" } }, "GEO": { "classifierName": "Location Elevation And Time", "color": "LightSkyBlue", "font": { "color": "black" } }, "HW": { "classifierName": "Hardware And Interfacing", "color": "Crimson", "font": { "color": "white" } }, "SYS": { "classifierName": "Computing And Programming", "color": "MediumPurple", "font": { "color": "white" } }, "DATA": { "classifierName": "Data Logging And Analysis", "color": "Indigo", "font": { "color": "white" } }, "DEPLOY": { "classifierName": "Field Deployment And Power", "color": "DarkOrchid", "font": { "color": "white" } }, "IMPACT": { "classifierName": "Environmental And Societal Impact", "color": "Orange", "font": { "color": "black" } } }, "nodes": [ { "id": 1, "label": "Environmental Monitoring", "group": "FOUND", "shape": "box" }, { "id": 2, "label": "Physical Property", "group": "FOUND", "shape": "box" }, { "id": 3, "label": "Measurement", "group": "FOUND" }, { "id": 4, "label": "Quantitative Data", "group": "FOUND" }, { "id": 5, "label": "Qualitative Observation", "group": "FOUND" }, { "id": 6, "label": "Unit Of Measure", "group": "FOUND" }, { "id": 7, "label": "SI Units", "group": "FOUND" }, { "id": 8, "label": "SI Prefix", "group": "FOUND" }, { "id": 9, "label": "Unit Conversion", "group": "FOUND" }, { "id": 10, "label": "Scientific Notation", "group": "FOUND" }, { "id": 11, "label": "Order Of Magnitude", "group": "FOUND" }, { "id": 12, "label": "Logarithmic Scale", "group": "FOUND" }, { "id": 13, "label": "Measurement Scale", "group": "FOUND" }, { "id": 14, "label": "Resolution", "group": "FOUND" }, { "id": 15, "label": "Accuracy", "group": "FOUND" }, { "id": 16, "label": "Precision", "group": "FOUND" }, { "id": 17, "label": "Measurement Uncertainty", "group": "FOUND" }, { "id": 18, "label": "Calibration", "group": "FOUND" }, { "id": 19, "label": "Reference Standard", "group": "FOUND" }, { "id": 20, "label": "Measurement Range", "group": "FOUND" }, { "id": 21, "label": "Standardization", "group": "FOUND" }, { "id": 22, "label": "Sensor", "group": "SENSE" }, { "id": 23, "label": "Transduction", "group": "SENSE" }, { "id": 24, "label": "Analog Signal", "group": "SENSE" }, { "id": 25, "label": "Digital Signal", "group": "SENSE" }, { "id": 26, "label": "Analog To Digital Conversion", "group": "SENSE" }, { "id": 27, "label": "Sensor Response Time", "group": "SENSE" }, { "id": 28, "label": "Piezoresistive Effect", "group": "SENSE" }, { "id": 29, "label": "Capacitive Sensing", "group": "SENSE" }, { "id": 30, "label": "Thermoelectric Effect", "group": "SENSE" }, { "id": 31, "label": "Photoelectric Effect", "group": "SENSE" }, { "id": 32, "label": "Semiconductor", "group": "SENSE" }, { "id": 33, "label": "Silicon Diode Sensor", "group": "SENSE" }, { "id": 34, "label": "MEMS Sensor", "group": "SENSE" }, { "id": 35, "label": "Sensor Filtering", "group": "SENSE" }, { "id": 36, "label": "Sensor Averaging", "group": "SENSE" }, { "id": 37, "label": "BME280 Sensor", "group": "SENSE" }, { "id": 38, "label": "Sensor Datasheet", "group": "SENSE" }, { "id": 39, "label": "Atmosphere", "group": "ATMOS", "shape": "box" }, { "id": 40, "label": "Air Mass", "group": "ATMOS" }, { "id": 41, "label": "Atmospheric Layer", "group": "ATMOS" }, { "id": 42, "label": "Weather", "group": "ATMOS" }, { "id": 43, "label": "Climate", "group": "ATMOS" }, { "id": 44, "label": "Meteorologist", "group": "ATMOS" }, { "id": 45, "label": "Climatologist", "group": "ATMOS" }, { "id": 46, "label": "High Pressure System", "group": "ATMOS" }, { "id": 47, "label": "Low Pressure System", "group": "ATMOS" }, { "id": 48, "label": "Weather Front", "group": "ATMOS" }, { "id": 49, "label": "Convection", "group": "ATMOS" }, { "id": 50, "label": "Evaporation", "group": "ATMOS" }, { "id": 51, "label": "Condensation", "group": "ATMOS" }, { "id": 52, "label": "Precipitation", "group": "ATMOS" }, { "id": 53, "label": "Cloud Formation", "group": "ATMOS" }, { "id": 54, "label": "Water Vapor", "group": "ATMOS" }, { "id": 55, "label": "Diurnal Cycle", "group": "ATMOS" }, { "id": 56, "label": "Seasonal Variation", "group": "ATMOS" }, { "id": 57, "label": "Temperature", "group": "TEMP" }, { "id": 58, "label": "Kinetic Energy Of Atoms", "group": "TEMP" }, { "id": 59, "label": "Heat Transfer", "group": "TEMP" }, { "id": 60, "label": "Infrared Radiation", "group": "TEMP" }, { "id": 61, "label": "Thermoscope", "group": "TEMP" }, { "id": 62, "label": "Liquid In Glass Thermometer", "group": "TEMP" }, { "id": 63, "label": "Fahrenheit Scale", "group": "TEMP" }, { "id": 64, "label": "Celsius Scale", "group": "TEMP" }, { "id": 65, "label": "Kelvin Scale", "group": "TEMP" }, { "id": 66, "label": "Absolute Zero", "group": "TEMP" }, { "id": 67, "label": "Freezing Point Of Water", "group": "TEMP" }, { "id": 68, "label": "Boiling Point Of Water", "group": "TEMP" }, { "id": 69, "label": "Thermocouple", "group": "TEMP" }, { "id": 70, "label": "Resistance Thermometer", "group": "TEMP" }, { "id": 71, "label": "Thermistor", "group": "TEMP" }, { "id": 72, "label": "Stevenson Screen", "group": "TEMP" }, { "id": 73, "label": "Air Temperature", "group": "TEMP" }, { "id": 74, "label": "Surface Temperature", "group": "TEMP" }, { "id": 75, "label": "Temperature Conversion", "group": "TEMP" }, { "id": 76, "label": "Pressure", "group": "PRESS" }, { "id": 77, "label": "Barometric Pressure", "group": "PRESS" }, { "id": 78, "label": "Vacuum", "group": "PRESS" }, { "id": 79, "label": "Mercury Barometer", "group": "PRESS" }, { "id": 80, "label": "Torricelli Experiment", "group": "PRESS" }, { "id": 81, "label": "Puy De Dome Experiment", "group": "PRESS" }, { "id": 82, "label": "Aneroid Barometer", "group": "PRESS" }, { "id": 83, "label": "Inches Of Mercury", "group": "PRESS" }, { "id": 84, "label": "Millibar", "group": "PRESS" }, { "id": 85, "label": "Hectopascal", "group": "PRESS" }, { "id": 86, "label": "Pascal Unit", "group": "PRESS" }, { "id": 87, "label": "One Atmosphere", "group": "PRESS" }, { "id": 88, "label": "Sea Level Pressure", "group": "PRESS" }, { "id": 89, "label": "Pressure Altitude", "group": "PRESS" }, { "id": 90, "label": "Altimeter", "group": "PRESS" }, { "id": 91, "label": "Pressure Tendency", "group": "PRESS" }, { "id": 92, "label": "Barometric Forecasting", "group": "PRESS" }, { "id": 93, "label": "Hydrostatic Pressure", "group": "PRESS" }, { "id": 94, "label": "Humidity", "group": "HUMID" }, { "id": 95, "label": "Absolute Humidity", "group": "HUMID" }, { "id": 96, "label": "Relative Humidity", "group": "HUMID" }, { "id": 97, "label": "Dew Point", "group": "HUMID" }, { "id": 98, "label": "Partial Pressure Of Vapor", "group": "HUMID" }, { "id": 99, "label": "Saturation Vapor Pressure", "group": "HUMID" }, { "id": 100, "label": "Hair Hygrometer", "group": "HUMID" }, { "id": 101, "label": "Psychrometer", "group": "HUMID" }, { "id": 102, "label": "Wet Bulb Temperature", "group": "HUMID" }, { "id": 103, "label": "Chilled Mirror Hygrometer", "group": "HUMID" }, { "id": 104, "label": "Capacitive Humidity Sensor", "group": "HUMID" }, { "id": 105, "label": "Dew And Frost Formation", "group": "HUMID" }, { "id": 106, "label": "Fog Formation", "group": "HUMID" }, { "id": 107, "label": "Apparent Temperature", "group": "HUMID" }, { "id": 108, "label": "Heat Index", "group": "HUMID" }, { "id": 109, "label": "Solar Radiation", "group": "SOLAR" }, { "id": 110, "label": "Electromagnetic Spectrum", "group": "SOLAR", "shape": "box" }, { "id": 111, "label": "Ultraviolet Radiation", "group": "SOLAR" }, { "id": 112, "label": "Visible Light", "group": "SOLAR" }, { "id": 113, "label": "Irradiance", "group": "SOLAR" }, { "id": 114, "label": "Solar Constant", "group": "SOLAR" }, { "id": 115, "label": "Insolation", "group": "SOLAR" }, { "id": 116, "label": "Watts Per Square Meter", "group": "SOLAR" }, { "id": 117, "label": "Pyrheliometer", "group": "SOLAR" }, { "id": 118, "label": "Pyranometer", "group": "SOLAR" }, { "id": 119, "label": "Bolometer", "group": "SOLAR" }, { "id": 120, "label": "Thermopile", "group": "SOLAR" }, { "id": 121, "label": "Photodiode", "group": "SOLAR" }, { "id": 122, "label": "Photovoltaic Effect", "group": "SOLAR" }, { "id": 123, "label": "Solar Cell", "group": "SOLAR" }, { "id": 124, "label": "UV Index", "group": "SOLAR" }, { "id": 125, "label": "Solar Zenith Angle", "group": "SOLAR" }, { "id": 126, "label": "Albedo", "group": "SOLAR" }, { "id": 127, "label": "Wind", "group": "WIND" }, { "id": 128, "label": "Wind Speed", "group": "WIND" }, { "id": 129, "label": "Wind Direction", "group": "WIND" }, { "id": 130, "label": "Weather Vane", "group": "WIND" }, { "id": 131, "label": "Pressure Gradient", "group": "WIND" }, { "id": 132, "label": "Anemometer", "group": "WIND" }, { "id": 133, "label": "Cup Anemometer", "group": "WIND" }, { "id": 134, "label": "Sonic Anemometer", "group": "WIND" }, { "id": 135, "label": "Beaufort Scale", "group": "WIND" }, { "id": 136, "label": "Knot Unit", "group": "WIND" }, { "id": 137, "label": "Meters Per Second", "group": "WIND" }, { "id": 138, "label": "Wind Gust", "group": "WIND" }, { "id": 139, "label": "Sustained Wind Speed", "group": "WIND" }, { "id": 140, "label": "Wind Chill", "group": "WIND" }, { "id": 141, "label": "Saffir Simpson Scale", "group": "WIND" }, { "id": 142, "label": "Enhanced Fujita Scale", "group": "WIND" }, { "id": 143, "label": "Wind Load", "group": "WIND" }, { "id": 144, "label": "Earthquake", "group": "SEIS" }, { "id": 145, "label": "Seismic Wave", "group": "SEIS" }, { "id": 146, "label": "P Wave", "group": "SEIS" }, { "id": 147, "label": "S Wave", "group": 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