Summary

Members	Descriptions
class Haar	Library for the rugged temperature, pressure, relative-humidity sensor.

class Haar

Library for the rugged temperature, pressure, relative-humidity sensor.

Project Haar, named for the cold fog off the north sea, is a pressure, temperature, and relative-humidity sensor that can withstand full submersion. Bobby Schulz designed it after the consistently-near-0C temperatures and 100% relative humidity of Chimborazo Volcano, Ecuador, claimed the lives of many brave but misguided BME-280 units, who then catistrophically bricked their I2C buses and those of their associated data loggers, thus taking down a large fraction of our hydromet network.

May their silicon and copper souls join the chorus of the stars.

Summary

Members	Descriptions
public Haar()	Instantiate the Haar sensor class.
public uint8_t begin(uint8_t ADR_)	Begin communications with the Haar sensor.
public float getPressure(bool update)	Return the currently stored pressure [in mBar].
public float getHumidity(bool update)	Return the currently stored relative humidity [%].
public float getTemperature(Sensor Device,bool update)	Return the currently stored Temperature [degrees C].
public uint8_t sleep(bool state)	Enable or disable device sleep mode THIS FUNCTION CURRENTLY DOES NOTHING!
public uint8_t updateMeasurements(bool block)	Return a new sample of all of the data.
public bool newData()	Checks for updated data. Returns true if new data are available; otherwise returns false
public String getString()	The most important function for the user! Returns all data as a comma-separated string: "P,RH,T(P),T[RH],".
public String getHeader()	Returns a header: "Pressure Atmos [mBar], Humidity [%], Temp Pres [C], Temp RH [C],".

Members

public Haar()

Instantiate the Haar sensor class.

public uint8_t begin(uint8_t ADR_)

Begin communications with the Haar sensor.

Parameters

• ADR_ I2C address. Defaults to 0x42.

public float getPressure(bool update)

Return the currently stored pressure [in mBar].

Parameters

• update Read and store a new pressure value before sending? By default is false; simply returns the already-available pressure value.

public float getHumidity(bool update)

Return the currently stored relative humidity [%].

Parameters

• update Read and store a new pressure value before sending? By default is false; simply returns the already-available RH value.

public float getTemperature(Sensor Device,bool update)

Return the currently stored Temperature [degrees C].

Parameters

• Device Selects which sensor is used to measure the temperature. Input can be RH_Sense, which corresponds to a 0, or Pres_Sense, which corresponds to a 1. By default, this is RH_Sense, as this sensor has a better internal temperature sensor.

• update Read and store a new pressure value before sending? By default is false; simply returns the already-available temperature value.

public uint8_t sleep(bool state)

Enable or disable device sleep mode THIS FUNCTION CURRENTLY DOES NOTHING!

Parameters

• State Can be ON (1) or OFF (0). By default, this command sets "Sleep" to ON, sending the device into a low-power sleep mode.

public uint8_t updateMeasurements(bool block)

Return a new sample of all of the data.

Parameters

• Block if true, wait for data to be returned. Defaults to false.

public bool newData()

Checks for updated data. Returns true if new data are available; otherwise returns false

Parameters

• Block if true, wait for data to be returned. Defaults to false.

public String getString()

The most important function for the user! Returns all data as a comma-separated string: "P,RH,T(P),T[RH],".

This string is: PRESSURE,RELATIVE_HUMIDITY, TEMPERATURE_FROM_PRESSURE_SENSOR,TEMPERATURE_FROM_RH_SENSOR,

public String getHeader()

Returns a header: "Pressure Atmos [mBar], Humidity [%], Temp Pres [C], Temp RH [C],".

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