Remarks
| Ms5611 | |
|---|---|
| Status |  |
| Source code | GitHub |
| Datasheet(s) | GitHub |
| NuGet package |  |
The MS5611 is a barometer and temperature sensor that communicates over I2C or SPI up to 20Mhz. Operating range: 10 to 1200 mbar, -40 to +85 °C.
Code Example
Ms5611 sensor;
public override Task Initialize()
{
Resolver.Log.Info("Initializing...");
sensor = new Ms5611(Device.CreateI2cBus());
var consumer = Ms5611.CreateObserver(
handler: result =>
{
Resolver.Log.Info($"Observer: Temp changed by threshold; new temp: {result.New.Temperature?.Celsius:N2}C, old: {result.Old?.Temperature?.Celsius:N2}C");
},
filter: result =>
{
//c# 8 pattern match syntax. checks for !null and assigns var.
if (result.Old is { } old)
{
return (
(result.New.Temperature.Value - old.Temperature.Value).Abs().Celsius > 0.5
&&
(result.New.Pressure.Value - old.Pressure.Value).Millibar > 0.5
);
}
return false;
}
);
sensor.Subscribe(consumer);
sensor.Updated += (sender, result) => {
Resolver.Log.Info($" Temperature: {result.New.Temperature?.Celsius:N2}C");
Resolver.Log.Info($" Pressure: {result.New.Pressure?.Millibar:N2}mbar ({result.New.Pressure?.Pascal:N2}Pa)");
};
return Task.CompletedTask;
}
public async override Task Run()
{
var conditions = await sensor.Read();
Resolver.Log.Info("Initial Readings:");
Resolver.Log.Info($" Temperature: {conditions.Temperature?.Celsius:N2}C");
Resolver.Log.Info($" Pressure: {conditions.Pressure?.Bar:N2}hPa");
sensor.StartUpdating(TimeSpan.FromSeconds(1));
}
Sample project(s) available on GitHub
Wiring Example
To wire a Ms5611 to your Meadow board, connect the following:
| Ms5611 | Meadow Pin |
|---|---|
| GND | GND |
| SCL | D08 (SCL) |
| SDA | D07 (SDA) |
| VCC | 3V3 |
It should look like the following diagram:
Syntax
public class Ms5611 : ByteCommsSensorBase<(Units.Temperature? Temperature, Pressure? Pressure)>, ISamplingSensor<(Units.Temperature? Temperature, Pressure? Pressure)>, ISamplingSensor<(Units.Temperature? Temperature, Pressure? Pressure)>, IDisposable, ITemperatureSensor, IBarometricPressureSensorConstructors
Ms5611(II2cBus, Byte, Ms5611.Resolution)
Connect to the Ms5611 using I2C
Declaration
public Ms5611(II2cBus i2cBus, byte address = null, Ms5611.Resolution resolution = default(Ms5611.Resolution))Parameters
| Type | Name | Description |
|---|---|---|
| II2cBus | i2cBus | The I2C bus connected to the device |
| System.Byte | address | I2c address - default is 0x5c |
| Ms5611.Resolution | resolution |
Properties
Pressure
The pressure, in hectopascals (hPa), from the last reading. 1 hPa is equal to one millibar, or 1/10th of a kilopascal (kPa)/centibar
Declaration
public Pressure? Pressure { get; }Property Value
| Type | Description |
|---|---|
| System.Nullable<Pressure> |
Temperature
The temperature, in degrees celsius (°C), from the last reading
Declaration
public Units.Temperature? Temperature { get; }Property Value
| Type | Description |
|---|---|
| System.Nullable<Units.Temperature> |
Methods
RaiseEventsAndNotify(IChangeResult<(Nullable<Units.Temperature> Temperature, Nullable<Pressure> Pressure)>)
Raise events for subcribers and notify of value changes
Declaration
protected override void RaiseEventsAndNotify(IChangeResult<(Units.Temperature? Temperature, Pressure? Pressure)> changeResult)Parameters
| Type | Name | Description |
|---|---|---|
| IChangeResult<System.ValueTuple<System.Nullable<Units.Temperature>, System.Nullable<Pressure>>> | changeResult | The updated sensor data |
ReadSensor()
Reads data from the sensor
Declaration
protected override Task<(Units.Temperature? Temperature, Pressure? Pressure)> ReadSensor()Returns
| Type | Description |
|---|---|
| Task<System.ValueTuple<System.Nullable<Units.Temperature>, System.Nullable<Pressure>>> | The latest sensor reading |
Overrides
Meadow.Foundation.SamplingSensorBase<System.ValueTuple<System.Nullable<Units.Temperature>, System.Nullable<Pressure>>>.ReadSensor()
Reset()
Reset the MS5611
Declaration
public void Reset()Events
PressureUpdated
Pressure changed event
Declaration
public event EventHandler<IChangeResult<Pressure>> PressureUpdatedEvent Type
| Type | Description |
|---|---|
| EventHandler<IChangeResult<Pressure>> |
TemperatureUpdated
Temperature changed event
Declaration
public event EventHandler<IChangeResult<Units.Temperature>> TemperatureUpdatedEvent Type
| Type | Description |
|---|---|
| EventHandler<IChangeResult<Units.Temperature>> |