Java - Outdoor Weather Bricklet

This is the description of the Java API bindings for the Outdoor Weather Bricklet. General information and technical specifications for the Outdoor Weather Bricklet are summarized in its hardware description.

An installation guide for the Java API bindings is part of their general description.

Examples

The example code below is Public Domain (CC0 1.0).

Callback

Download (ExampleCallback.java)

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import com.tinkerforge.IPConnection;
import com.tinkerforge.BrickletOutdoorWeather;

public class ExampleCallback {
    private static final String HOST = "localhost";
    private static final int PORT = 4223;

    // Change XYZ to the UID of your Outdoor Weather Bricklet
    private static final String UID = "XYZ";

    // Note: To make the example code cleaner we do not handle exceptions. Exceptions
    //       you might normally want to catch are described in the documentation
    public static void main(String args[]) throws Exception {
        IPConnection ipcon = new IPConnection(); // Create IP connection
        BrickletOutdoorWeather ow = new BrickletOutdoorWeather(UID, ipcon); // Create device object

        ipcon.connect(HOST, PORT); // Connect to brickd
        // Don't use device before ipcon is connected

        // Enable station data callbacks
        ow.setStationCallbackConfiguration(true);

        // Enable sensor data callbacks
        ow.setSensorCallbackConfiguration(true);

        // Add station data listener
        ow.addStationDataListener(new BrickletOutdoorWeather.StationDataListener() {
            public void stationData(int identifier, int temperature, int humidity,
                                    long windSpeed, long gustSpeed, long rain,
                                    int windDirection, boolean batteryLow) {
                System.out.println("Identifier (Station): " + identifier);
                System.out.println("Temperature (Station): " + temperature/10.0 + " °C");
                System.out.println("Humidity (Station): " + humidity + " %RH");
                System.out.println("Wind Speed (Station): " + windSpeed/10.0 + " m/s");
                System.out.println("Gust Speed (Station): " + gustSpeed/10.0 + " m/s");
                System.out.println("Rain (Station): " + rain/10.0 + " mm");
                System.out.println("Wind Direction (Station): " + windDirection);
                System.out.println("Battery Low (Station): " + batteryLow);
                System.out.println("");
            }
        });

        // Add sensor data listener
        ow.addSensorDataListener(new BrickletOutdoorWeather.SensorDataListener() {
            public void sensorData(int identifier, int temperature, int humidity) {
                System.out.println("Identifier (Sensor): " + identifier);
                System.out.println("Temperature (Sensor): " + temperature/10.0 + " °C");
                System.out.println("Humidity (Sensor): " + humidity + " %RH");
                System.out.println("");
            }
        });

        System.out.println("Press key to exit"); System.in.read();
        ipcon.disconnect();
    }
}

API

Generally, every method of the Java bindings that returns a value can throw a TimeoutException. This exception gets thrown if the device did not respond. If a cable based connection is used, it is unlikely that this exception gets thrown (assuming nobody unplugs the device). However, if a wireless connection is used, timeouts will occur if the distance to the device gets too big.

Beside the TimeoutException there is also a NotConnectedException that is thrown if a method needs to communicate with the device while the IP Connection is not connected.

Since Java does not support multiple return values and return by reference is not possible for primitive types, we use small classes that only consist of member variables. The member variables of the returned objects are described in the corresponding method descriptions.

The package for all Brick/Bricklet bindings and the IP Connection is com.tinkerforge.*

All methods listed below are thread-safe.

Basic Functions

public class BrickletOutdoorWeather(String uid, IPConnection ipcon)

Creates an object with the unique device ID uid:

BrickletOutdoorWeather outdoorWeather = new BrickletOutdoorWeather("YOUR_DEVICE_UID", ipcon);

This object can then be used after the IP Connection is connected (see examples above).

public int[] getStationIdentifiers()

Returns the identifiers (number between 0 and 255) of all stations that have been seen since the startup of the Bricklet.

Each station gives itself a random identifier on first startup.

public int[] getSensorIdentifiers()

Returns the identifiers (number between 0 and 255) of all sensors that have been seen since the startup of the Bricklet.

Each sensor gives itself a random identifier on first startup.

public BrickletOutdoorWeather.StationData getStationData(int identifier)

Returns the last received data for a station with the given identifier. Call getStationIdentifiers() for a list of all available identifiers.

The return values are:

  • Temperature in °C/10,
  • Humidity in %RH,
  • Wind Speed in m/10s,
  • Gust Speed in m/10s,
  • Rain Fall in mm/10,
  • Wind Direction (N, NNE, NE, ENE, E, ESE, SE, SSE, S, SSW, SW, WSW, W, WNW, NW, NNW),
  • Battery Low (true or false) and
  • Last Change (time in seconds since the reception of this data).

The following constants are available for this function:

  • BrickletOutdoorWeather.WIND_DIRECTION_N = 0
  • BrickletOutdoorWeather.WIND_DIRECTION_NNE = 1
  • BrickletOutdoorWeather.WIND_DIRECTION_NE = 2
  • BrickletOutdoorWeather.WIND_DIRECTION_ENE = 3
  • BrickletOutdoorWeather.WIND_DIRECTION_E = 4
  • BrickletOutdoorWeather.WIND_DIRECTION_ESE = 5
  • BrickletOutdoorWeather.WIND_DIRECTION_SE = 6
  • BrickletOutdoorWeather.WIND_DIRECTION_SSE = 7
  • BrickletOutdoorWeather.WIND_DIRECTION_S = 8
  • BrickletOutdoorWeather.WIND_DIRECTION_SSW = 9
  • BrickletOutdoorWeather.WIND_DIRECTION_SW = 10
  • BrickletOutdoorWeather.WIND_DIRECTION_WSW = 11
  • BrickletOutdoorWeather.WIND_DIRECTION_W = 12
  • BrickletOutdoorWeather.WIND_DIRECTION_WNW = 13
  • BrickletOutdoorWeather.WIND_DIRECTION_NW = 14
  • BrickletOutdoorWeather.WIND_DIRECTION_NNW = 15
  • BrickletOutdoorWeather.WIND_DIRECTION_ERROR = 255

The returned object has the public member variables int temperature, int humidity, long windSpeed, long gustSpeed, long rain, int windDirection, boolean batteryLow and int lastChange.

public BrickletOutdoorWeather.SensorData getSensorData(int identifier)

Returns the last measured data for a sensor with the given identifier. Call getSensorIdentifiers() for a list of all available identifiers.

The return values are:

  • Temperature in °C/10,
  • Humidity in %RH and
  • Last Change (time in seconds since the last reception of data).

The returned object has the public member variables int temperature, int humidity and int lastChange.

Advanced Functions

public int[] getAPIVersion()

Returns the version of the API definition (major, minor, revision) implemented by this API bindings. This is neither the release version of this API bindings nor does it tell you anything about the represented Brick or Bricklet.

public boolean getResponseExpected(int functionId)

Returns the response expected flag for the function specified by the function ID parameter. It is true if the function is expected to send a response, false otherwise.

For getter functions this is enabled by default and cannot be disabled, because those functions will always send a response. For listener configuration functions it is enabled by default too, but can be disabled by setResponseExpected(). For setter functions it is disabled by default and can be enabled.

Enabling the response expected flag for a setter function allows to detect timeouts and other error conditions calls of this setter as well. The device will then send a response for this purpose. If this flag is disabled for a setter function then no response is send and errors are silently ignored, because they cannot be detected.

See setResponseExpected() for the list of function ID constants available for this function.

public void setResponseExpected(int functionId, boolean responseExpected)

Changes the response expected flag of the function specified by the function ID parameter. This flag can only be changed for setter (default value: false) and listener configuration functions (default value: true). For getter functions it is always enabled.

Enabling the response expected flag for a setter function allows to detect timeouts and other error conditions calls of this setter as well. The device will then send a response for this purpose. If this flag is disabled for a setter function then no response is send and errors are silently ignored, because they cannot be detected.

The following function ID constants are available for this function:

  • BrickletOutdoorWeather.FUNCTION_SET_STATION_CALLBACK_CONFIGURATION = 5
  • BrickletOutdoorWeather.FUNCTION_SET_SENSOR_CALLBACK_CONFIGURATION = 7
  • BrickletOutdoorWeather.FUNCTION_SET_WRITE_FIRMWARE_POINTER = 237
  • BrickletOutdoorWeather.FUNCTION_SET_STATUS_LED_CONFIG = 239
  • BrickletOutdoorWeather.FUNCTION_RESET = 243
  • BrickletOutdoorWeather.FUNCTION_WRITE_UID = 248
public void setResponseExpectedAll(boolean responseExpected)

Changes the response expected flag for all setter and listener configuration functions of this device at once.

public BrickletOutdoorWeather.SPITFPErrorCount getSPITFPErrorCount()

Returns the error count for the communication between Brick and Bricklet.

The errors are divided into

  • ACK checksum errors,
  • message checksum errors,
  • framing errors and
  • overflow errors.

The errors counts are for errors that occur on the Bricklet side. All Bricks have a similar function that returns the errors on the Brick side.

The returned object has the public member variables long errorCountAckChecksum, long errorCountMessageChecksum, long errorCountFrame and long errorCountOverflow.

public int setBootloaderMode(int mode)

Sets the bootloader mode and returns the status after the requested mode change was instigated.

You can change from bootloader mode to firmware mode and vice versa. A change from bootloader mode to firmware mode will only take place if the entry function, device identifier and CRC are present and correct.

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

The following constants are available for this function:

  • BrickletOutdoorWeather.BOOTLOADER_MODE_BOOTLOADER = 0
  • BrickletOutdoorWeather.BOOTLOADER_MODE_FIRMWARE = 1
  • BrickletOutdoorWeather.BOOTLOADER_MODE_BOOTLOADER_WAIT_FOR_REBOOT = 2
  • BrickletOutdoorWeather.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_REBOOT = 3
  • BrickletOutdoorWeather.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_ERASE_AND_REBOOT = 4
  • BrickletOutdoorWeather.BOOTLOADER_STATUS_OK = 0
  • BrickletOutdoorWeather.BOOTLOADER_STATUS_INVALID_MODE = 1
  • BrickletOutdoorWeather.BOOTLOADER_STATUS_NO_CHANGE = 2
  • BrickletOutdoorWeather.BOOTLOADER_STATUS_ENTRY_FUNCTION_NOT_PRESENT = 3
  • BrickletOutdoorWeather.BOOTLOADER_STATUS_DEVICE_IDENTIFIER_INCORRECT = 4
  • BrickletOutdoorWeather.BOOTLOADER_STATUS_CRC_MISMATCH = 5
public int getBootloaderMode()

Returns the current bootloader mode, see setBootloaderMode().

The following constants are available for this function:

  • BrickletOutdoorWeather.BOOTLOADER_MODE_BOOTLOADER = 0
  • BrickletOutdoorWeather.BOOTLOADER_MODE_FIRMWARE = 1
  • BrickletOutdoorWeather.BOOTLOADER_MODE_BOOTLOADER_WAIT_FOR_REBOOT = 2
  • BrickletOutdoorWeather.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_REBOOT = 3
  • BrickletOutdoorWeather.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_ERASE_AND_REBOOT = 4
public void setWriteFirmwarePointer(long pointer)

Sets the firmware pointer for writeFirmware(). The pointer has to be increased by chunks of size 64. The data is written to flash every 4 chunks (which equals to one page of size 256).

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

public int writeFirmware(int[] data)

Writes 64 Bytes of firmware at the position as written by setWriteFirmwarePointer() before. The firmware is written to flash every 4 chunks.

You can only write firmware in bootloader mode.

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

public void setStatusLEDConfig(int config)

Sets the status LED configuration. By default the LED shows communication traffic between Brick and Bricklet, it flickers once for every 10 received data packets.

You can also turn the LED permanently on/off or show a heartbeat.

If the Bricklet is in bootloader mode, the LED is will show heartbeat by default.

The following constants are available for this function:

  • BrickletOutdoorWeather.STATUS_LED_CONFIG_OFF = 0
  • BrickletOutdoorWeather.STATUS_LED_CONFIG_ON = 1
  • BrickletOutdoorWeather.STATUS_LED_CONFIG_SHOW_HEARTBEAT = 2
  • BrickletOutdoorWeather.STATUS_LED_CONFIG_SHOW_STATUS = 3
public int getStatusLEDConfig()

Returns the configuration as set by setStatusLEDConfig()

The following constants are available for this function:

  • BrickletOutdoorWeather.STATUS_LED_CONFIG_OFF = 0
  • BrickletOutdoorWeather.STATUS_LED_CONFIG_ON = 1
  • BrickletOutdoorWeather.STATUS_LED_CONFIG_SHOW_HEARTBEAT = 2
  • BrickletOutdoorWeather.STATUS_LED_CONFIG_SHOW_STATUS = 3
public int getChipTemperature()

Returns the temperature in °C as measured inside the microcontroller. The value returned is not the ambient temperature!

The temperature is only proportional to the real temperature and it has bad accuracy. Practically it is only useful as an indicator for temperature changes.

public void reset()

Calling this function will reset the Bricklet. All configurations will be lost.

After a reset you have to create new device objects, calling functions on the existing ones will result in undefined behavior!

public void writeUID(long uid)

Writes a new UID into flash. If you want to set a new UID you have to decode the Base58 encoded UID string into an integer first.

We recommend that you use Brick Viewer to change the UID.

public long readUID()

Returns the current UID as an integer. Encode as Base58 to get the usual string version.

public BrickletOutdoorWeather.Identity getIdentity()

Returns the UID, the UID where the Bricklet is connected to, the position, the hardware and firmware version as well as the device identifier.

The position can be 'a', 'b', 'c' or 'd'.

The device identifier numbers can be found here. There is also a constant for the device identifier of this Bricklet.

The returned object has the public member variables String uid, String connectedUid, char position, int[] hardwareVersion, int[] firmwareVersion and int deviceIdentifier.

Listener Configuration Functions

public void setStationCallbackConfiguration(boolean enableCallback)

Turns listener for station data on or off. Default is off.

public boolean getStationCallbackConfiguration()

Returns the configuration as set by setStationCallbackConfiguration().

public void setSensorCallbackConfiguration(boolean enableCallback)

Turns listener for sensor data on or off. Default is off.

public boolean getSensorCallbackConfiguration()

Returns the configuration as set by setSensorCallbackConfiguration().

Listeners

Listeners can be registered to receive time critical or recurring data from the device. The registration is done with "add*Listener" functions of the device object.

The parameter is a listener class object, for example:

device.addExampleListener(new BrickletOutdoorWeather.ExampleListener() {
    public void property(int value) {
        System.out.println("Value: " + value);
    }
});

The available listener classes with inherent methods to be overwritten are described below. It is possible to add several listeners and to remove them with the corresponding "remove*Listener" function.

Note

Using listeners for recurring events is always preferred compared to using getters. It will use less USB bandwidth and the latency will be a lot better, since there is no round trip time.

public class BrickletOutdoorWeather.StationDataListener()

This listener can be added with the addStationDataListener() function. An added listener can be removed with the removeStationDataListener() function.

public void stationData(int identifier, int temperature, int humidity, long windSpeed, long gustSpeed, long rain, int windDirection, boolean batteryLow)

Reports the station data every time a new data packet is received. See getStationData() for information about the data.

For each station the listener will be triggered about every 45 seconds.

Turn the listener on/off with setStationCallbackConfiguration() (by default it is turned off).

The following constants are available for this function:

  • BrickletOutdoorWeather.WIND_DIRECTION_N = 0
  • BrickletOutdoorWeather.WIND_DIRECTION_NNE = 1
  • BrickletOutdoorWeather.WIND_DIRECTION_NE = 2
  • BrickletOutdoorWeather.WIND_DIRECTION_ENE = 3
  • BrickletOutdoorWeather.WIND_DIRECTION_E = 4
  • BrickletOutdoorWeather.WIND_DIRECTION_ESE = 5
  • BrickletOutdoorWeather.WIND_DIRECTION_SE = 6
  • BrickletOutdoorWeather.WIND_DIRECTION_SSE = 7
  • BrickletOutdoorWeather.WIND_DIRECTION_S = 8
  • BrickletOutdoorWeather.WIND_DIRECTION_SSW = 9
  • BrickletOutdoorWeather.WIND_DIRECTION_SW = 10
  • BrickletOutdoorWeather.WIND_DIRECTION_WSW = 11
  • BrickletOutdoorWeather.WIND_DIRECTION_W = 12
  • BrickletOutdoorWeather.WIND_DIRECTION_WNW = 13
  • BrickletOutdoorWeather.WIND_DIRECTION_NW = 14
  • BrickletOutdoorWeather.WIND_DIRECTION_NNW = 15
  • BrickletOutdoorWeather.WIND_DIRECTION_ERROR = 255
public class BrickletOutdoorWeather.SensorDataListener()

This listener can be added with the addSensorDataListener() function. An added listener can be removed with the removeSensorDataListener() function.

public void sensorData(int identifier, int temperature, int humidity)

Reports the sensor data every time a new data packet is received. See getSensorData() for information about the data.

For each station the listener will be called about every 45 seconds.

Turn the listener on/off with setSensorCallbackConfiguration() (by default it is turned off).

Constants

public static final int BrickletOutdoorWeather.DEVICE_IDENTIFIER

This constant is used to identify a Outdoor Weather Bricklet.

The getIdentity() function and the EnumerateListener listener of the IP Connection have a deviceIdentifier parameter to specify the Brick's or Bricklet's type.

public static final String BrickletOutdoorWeather.DEVICE_DISPLAY_NAME

This constant represents the human readable name of a Outdoor Weather Bricklet.