Remarks
| MPL115A2 | |
|---|---|
| Status | Untested |
| Source code | GitHub |
| NuGet package | Not published |
The MPL115A2 is a low cost device for reading barometric pressure.
- I2C digital interface (address:
0x60) - Resolution: 1.5 hPa
- Range: 100-1150 hPa up to 10Km
Sample projects available on GitHub
Purchasing
The MPL115A2 sensor is available on a breakout board from Adafruit
The application below connects the MPL115A2 to two interrupt handlers. These interrupt handlers (events) will display the Temperature and Pressure properties when the handlers are triggered. The sensor is checked every 500 milliseconds.
Wiring Example
Connecting the MPL115A2 to Meadow requires four connections:
In this diagram, the shutdown (SDWN) and reset (RST) pins have been left floating. Both of these pins are active low and can be tied to Vcc in normal operation.
Note that the Adafruit breakout board has 10K pull-up resistors on the SDA and SCK lines.
| Characteristic | Locus |
|---|---|
| Inheritance | System.Object > Mpl115a2 |
| Implements | IAtmosphericSensor ITemperatureSensor IBarometricPressureSensor |
| Namespace | Meadow.Foundation.Sensors.Atmospheric |
| Assembly | MPL115A2.dll |
Syntax
public class Mpl115a2 : FilterableObservableBase<AtmosphericConditionChangeResult, AtmosphericConditions>, IAtmosphericSensor, ITemperatureSensor, IBarometricPressureSensorConstructors
Mpl115a2(II2cBus, Byte)
Create a new MPL115A2 temperature and humidity sensor object.
Declaration
public Mpl115a2(II2cBus i2cBus, byte address = 96)Parameters
| Type | Name | Description |
|---|---|---|
| II2cBus | i2cBus | I2CBus (default to 100 KHz). |
| System.Byte | address | Sensor address (default to 0x60). |
Properties
Conditions
The AtmosphericConditions from the last reading.
Declaration
public AtmosphericConditions Conditions { get; protected set; }Property Value
| Type | Description |
|---|---|
| AtmosphericConditions |
IsSampling
Gets a value indicating whether the analog input port is currently sampling the ADC. Call StartSampling() to spin up the sampling process.
Declaration
public bool IsSampling { get; protected set; }Property Value
| Type | Description |
|---|---|
| System.Boolean |
|
Pressure
The humidity, in percent relative humidity, from the last reading..
Declaration
public float Pressure { get; }Property Value
| Type | Description |
|---|---|
| System.Single |
Temperature
The temperature, in degrees celsius (°C), from the last reading.
Declaration
public float Temperature { get; }Property Value
| Type | Description |
|---|---|
| System.Single |
Methods
RaiseChangedAndNotify(AtmosphericConditionChangeResult)
Declaration
protected void RaiseChangedAndNotify(AtmosphericConditionChangeResult changeResult)Parameters
| Type | Name | Description |
|---|---|---|
| AtmosphericConditionChangeResult | changeResult |
Read()
Convenience method to get the current sensor readings. For frequent reads, use StartSampling() and StopSampling() in conjunction with the SampleBuffer.
Declaration
public Task<AtmosphericConditions> Read()Returns
| Type | Description |
|---|---|
| System.Threading.Tasks.Task<AtmosphericConditions> |
StartUpdating(Int32)
Declaration
public void StartUpdating(int standbyDuration = 1000)Parameters
| Type | Name | Description |
|---|---|---|
| System.Int32 | standbyDuration |
StopUpdating()
Stops sampling the temperature.
Declaration
public void StopUpdating()Update()
Update the temperature and pressure from the sensor and set the Pressure property.
Declaration
public Task Update()Returns
| Type | Description |
|---|---|
| System.Threading.Tasks.Task |
Events
Updated
Declaration
public event EventHandler<AtmosphericConditionChangeResult> UpdatedEvent Type
| Type | Description |
|---|---|
| System.EventHandler<AtmosphericConditionChangeResult> |