PressureMeasurement Cluster

Cluster ID: 0x0403  |  Endpoint: Typically on Endpoint 1+ (application endpoint)

PressureMeasurement reports the pressure value measured by an atmospheric/barometric pressure sensor. This Cluster is read-only — it has no Commands. The device acts as a Server, passively reporting data, while the App (Client) simply reads or subscribes. Commonly found on weather stations, temperature/humidity/barometer combos, and HVAC systems.

Feature Map

PressureMeasurement defines one optional Feature for providing higher-precision pressure data.

Base Attributes

The following 4 Attributes are supported by all PressureMeasurement devices. Click an Attribute ID to jump to its detailed description.

MeasuredValue (Current Measured Pressure)

The most recently measured pressure from the sensor, in units of kPa. This is the most important Attribute of the entire Cluster.

• Type: int16 (signed), Nullable
• Range: -32767 to 32767 kPa
• Conversion: hPa = MeasuredValue × 10

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MinMeasuredValue (Minimum Measurable Pressure)

The lowest pressure the sensor can measure, in units of kPa. A value of null indicates the device has not defined a lower limit.

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MaxMeasuredValue (Maximum Measurable Pressure)

The highest pressure the sensor can measure, in units of kPa. A value of null indicates the device has not defined an upper limit.

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Tolerance (Measurement Tolerance)

The measurement tolerance of the sensor, in units of kPa. For example, a value of 1 means an accuracy of ±1 kPa (±10 hPa). This is an optional Attribute and not all devices report it.

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Extended Attributes (EXT Feature)

The following Attributes are only present when the device supports the EXT Feature, providing higher precision than the base kPa integer values.

ScaledValue (High-Precision Pressure Value)

The high-precision pressure measurement, which requires the Scale Attribute for conversion:

Actual pressure = ScaledValue × 10^Scale kPa

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MinScaledValue / MaxScaledValue

The valid range bounds for ScaledValue, corresponding to the Min/Max of the base Attributes. Both are Nullable; null indicates undefined. Conversion is the same as ScaledValue (multiply by 10^Scale).

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ScaledTolerance (Extended Tolerance)

The measurement tolerance for ScaledValue, converted the same way. For example, ScaledTolerance = 10 with Scale = -1 means an accuracy of ±1 hPa.

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Scale (Exponent Factor)

An int8 exponent value that determines the actual precision of the ScaledValue family of Attributes. Common values:

• 0 — same as the base Attributes, unit kPa, no additional precision
• -1 — precision 0.1 kPa (= 1 hPa), most commonly used
• -2 — precision 0.01 kPa (= 0.1 hPa), for high-precision weather stations

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Commands

PressureMeasurement is a read-only Server Cluster with no Commands. The device is responsible for collecting pressure data and updating Attributes; the App only needs to Read or Subscribe to obtain data.

Example Data

Reading the PressureMeasurement base Attributes from a weather station device:

{
  // --- PressureMeasurement Cluster (Endpoint 1) ---
  "0x0": 101,         // MeasuredValue = 101 → actual 101 kPa (≈ standard atmospheric pressure)
  "0x1": 30,          // MinMeasuredValue = 30 → 30 kPa
  "0x2": 110,         // MaxMeasuredValue = 110 → 110 kPa
  "0x3": 1            // Tolerance = 1 → ±1 kPa
}

Devices supporting the EXT Feature also return extended Attributes:

{
  // --- Extended precision Attributes (requires EXT Feature) ---
  "0x10": 10132,      // ScaledValue = 10132, Scale = -1 → 10132 × 10⁻¹ = 1013.2 kPa?
                       // No, Scale is for subdivision: 10132 × 10⁻¹ = 1013.2 hPa = 101.32 kPa
  "0x11": 3000,       // MinScaledValue = 3000
  "0x12": 11000,      // MaxScaledValue = 11000
  "0x13": 10,         // ScaledTolerance = 10
  "0x14": -1          // Scale = -1 (exponent)
  // Actual value = ScaledValue × 10^Scale kPa = 10132 × 0.1 = 1013.2 hPa
}

Subscribe to pressure changes — track pressure trends in real time:

{
  // Subscribe to pressure changes (report every 60 seconds to 10 minutes)
  "subscribeRequests": [{
    "attributePath": {
      "endpointId": 1,
      "clusterId": "0x0403",
      "attributeId": "0x00"        // MeasuredValue
    },
    "minIntervalFloor": 60,        // Report at least every 60 seconds
    "maxIntervalCeiling": 600      // Report at most every 10 minutes
  }]
}

{`// Base Attribute: MeasuredValue in kPa
val rawKpa: Int? = 101               // Nullable
val hPa = rawKpa?.let { it * 10.0 }  // → 1010.0 hPa
val display = hPa?.let { "%.0f hPa".format(it) } ?: "--"

// EXT extended Attributes: ScaledValue + Scale
val scaled: Int? = 10132
val scale: Int = -1
val actualKpa = scaled?.let { it * Math.pow(10.0, scale.toDouble()) }  // → 1013.2 hPa
val displayExt = actualKpa?.let { "%.1f hPa".format(it) } ?: "--"`}

Common Scenarios