MATLAB/Octave - CO2 Bricklet

This is the description of the MATLAB/Octave API bindings for the CO2 Bricklet. General information and technical specifications for the CO2 Bricklet are summarized in its hardware description.

An installation guide for the MATLAB/Octave API bindings is part of their general description.

Examples

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

Simple (MATLAB)

Download (matlab_example_simple.m)

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function matlab_example_simple()
    import com.tinkerforge.IPConnection;
    import com.tinkerforge.BrickletCO2;

    HOST = 'localhost';
    PORT = 4223;
    UID = 'XYZ'; % Change XYZ to the UID of your CO2 Bricklet

    ipcon = IPConnection(); % Create IP connection
    co2 = handle(BrickletCO2(UID, ipcon), 'CallbackProperties'); % Create device object

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

    % Get current CO2 concentration
    co2Concentration = co2.getCO2Concentration();
    fprintf('CO2 Concentration: %i ppm\n', co2Concentration);

    input('Press key to exit\n', 's');
    ipcon.disconnect();
end

Callback (MATLAB)

Download (matlab_example_callback.m)

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function matlab_example_callback()
    import com.tinkerforge.IPConnection;
    import com.tinkerforge.BrickletCO2;

    HOST = 'localhost';
    PORT = 4223;
    UID = 'XYZ'; % Change XYZ to the UID of your CO2 Bricklet

    ipcon = IPConnection(); % Create IP connection
    co2 = handle(BrickletCO2(UID, ipcon), 'CallbackProperties'); % Create device object

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

    % Register CO2 concentration callback to function cb_co2_concentration
    set(co2, 'CO2ConcentrationCallback', @(h, e) cb_co2_concentration(e));

    % Set period for CO2 concentration callback to 1s (1000ms)
    % Note: The CO2 concentration callback is only called every second
    %       if the CO2 concentration has changed since the last call!
    co2.setCO2ConcentrationCallbackPeriod(1000);

    input('Press key to exit\n', 's');
    ipcon.disconnect();
end

% Callback function for CO2 concentration callback
function cb_co2_concentration(e)
    fprintf('CO2 Concentration: %i ppm\n', e.co2Concentration);
end

Threshold (MATLAB)

Download (matlab_example_threshold.m)

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function matlab_example_threshold()
    import com.tinkerforge.IPConnection;
    import com.tinkerforge.BrickletCO2;

    HOST = 'localhost';
    PORT = 4223;
    UID = 'XYZ'; % Change XYZ to the UID of your CO2 Bricklet

    ipcon = IPConnection(); % Create IP connection
    co2 = handle(BrickletCO2(UID, ipcon), 'CallbackProperties'); % Create device object

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

    % Get threshold callbacks with a debounce time of 10 seconds (10000ms)
    co2.setDebouncePeriod(10000);

    % Register CO2 concentration reached callback to function cb_co2_concentration_reached
    set(co2, 'CO2ConcentrationReachedCallback', @(h, e) cb_co2_concentration_reached(e));

    % Configure threshold for CO2 concentration "greater than 750 ppm"
    co2.setCO2ConcentrationCallbackThreshold('>', 750, 0);

    input('Press key to exit\n', 's');
    ipcon.disconnect();
end

% Callback function for CO2 concentration reached callback
function cb_co2_concentration_reached(e)
    fprintf('CO2 Concentration: %i ppm\n', e.co2Concentration);
end

Simple (Octave)

Download (octave_example_simple.m)

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function octave_example_simple()
    more off;

    HOST = "localhost";
    PORT = 4223;
    UID = "XYZ"; % Change XYZ to the UID of your CO2 Bricklet

    ipcon = javaObject("com.tinkerforge.IPConnection"); % Create IP connection
    co2 = javaObject("com.tinkerforge.BrickletCO2", UID, ipcon); % Create device object

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

    % Get current CO2 concentration
    co2Concentration = co2.getCO2Concentration();
    fprintf("CO2 Concentration: %d ppm\n", co2Concentration);

    input("Press key to exit\n", "s");
    ipcon.disconnect();
end

Callback (Octave)

Download (octave_example_callback.m)

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function octave_example_callback()
    more off;

    HOST = "localhost";
    PORT = 4223;
    UID = "XYZ"; % Change XYZ to the UID of your CO2 Bricklet

    ipcon = javaObject("com.tinkerforge.IPConnection"); % Create IP connection
    co2 = javaObject("com.tinkerforge.BrickletCO2", UID, ipcon); % Create device object

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

    % Register CO2 concentration callback to function cb_co2_concentration
    co2.addCO2ConcentrationCallback(@cb_co2_concentration);

    % Set period for CO2 concentration callback to 1s (1000ms)
    % Note: The CO2 concentration callback is only called every second
    %       if the CO2 concentration has changed since the last call!
    co2.setCO2ConcentrationCallbackPeriod(1000);

    input("Press key to exit\n", "s");
    ipcon.disconnect();
end

% Callback function for CO2 concentration callback
function cb_co2_concentration(e)
    fprintf("CO2 Concentration: %d ppm\n", e.co2Concentration);
end

Threshold (Octave)

Download (octave_example_threshold.m)

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function octave_example_threshold()
    more off;

    HOST = "localhost";
    PORT = 4223;
    UID = "XYZ"; % Change XYZ to the UID of your CO2 Bricklet

    ipcon = javaObject("com.tinkerforge.IPConnection"); % Create IP connection
    co2 = javaObject("com.tinkerforge.BrickletCO2", UID, ipcon); % Create device object

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

    % Get threshold callbacks with a debounce time of 10 seconds (10000ms)
    co2.setDebouncePeriod(10000);

    % Register CO2 concentration reached callback to function cb_co2_concentration_reached
    co2.addCO2ConcentrationReachedCallback(@cb_co2_concentration_reached);

    % Configure threshold for CO2 concentration "greater than 750 ppm"
    co2.setCO2ConcentrationCallbackThreshold(">", 750, 0);

    input("Press key to exit\n", "s");
    ipcon.disconnect();
end

% Callback function for CO2 concentration reached callback
function cb_co2_concentration_reached(e)
    fprintf("CO2 Concentration: %d ppm\n", e.co2Concentration);
end

API

Generally, every method of the MATLAB 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 the MATLAB bindings are based on Java and 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 BrickletCO2(String uid, IPConnection ipcon)

Creates an object with the unique device ID uid.

In MATLAB:

import com.tinkerforge.BrickletCO2;

co2 = BrickletCO2('YOUR_DEVICE_UID', ipcon);

In Octave:

co2 = java_new("com.tinkerforge.BrickletCO2", "YOUR_DEVICE_UID", ipcon);

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

public int getCO2Concentration()

Returns the measured CO2 concentration. The value is in ppm (parts per million) and between 0 to 10000.

If you want to get the CO2 concentration periodically, it is recommended to use the CO2ConcentrationCallback callback and set the period with setCO2ConcentrationCallbackPeriod().

Advanced Functions

public short[] 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(short 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 callback 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(short 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 callback 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:

  • BrickletCO2.FUNCTION_SET_CO2_CONCENTRATION_CALLBACK_PERIOD = 2
  • BrickletCO2.FUNCTION_SET_CO2_CONCENTRATION_CALLBACK_THRESHOLD = 4
  • BrickletCO2.FUNCTION_SET_DEBOUNCE_PERIOD = 6
public void setResponseExpectedAll(boolean responseExpected)

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

public BrickletCO2.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, short[] hardwareVersion, short[] firmwareVersion and int deviceIdentifier.

Callback Configuration Functions

public void setCO2ConcentrationCallbackPeriod(long period)

Sets the period in ms with which the CO2ConcentrationCallback callback is triggered periodically. A value of 0 turns the callback off.

The CO2ConcentrationCallback callback is only triggered if the CO2 concentration has changed since the last triggering.

The default value is 0.

public long getCO2ConcentrationCallbackPeriod()

Returns the period as set by setCO2ConcentrationCallbackPeriod().

public void setCO2ConcentrationCallbackThreshold(char option, int min, int max)

Sets the thresholds for the CO2ConcentrationReachedCallback callback.

The following options are possible:

Option Description
'x' Callback is turned off
'o' Callback is triggered when the CO2 concentration is outside the min and max values
'i' Callback is triggered when the CO2 concentration is inside the min and max values
'<' Callback is triggered when the CO2 concentration is smaller than the min value (max is ignored)
'>' Callback is triggered when the CO2 concentration is greater than the min value (max is ignored)

The default value is ('x', 0, 0).

The following constants are available for this function:

  • BrickletCO2.THRESHOLD_OPTION_OFF = 'x'
  • BrickletCO2.THRESHOLD_OPTION_OUTSIDE = 'o'
  • BrickletCO2.THRESHOLD_OPTION_INSIDE = 'i'
  • BrickletCO2.THRESHOLD_OPTION_SMALLER = '<'
  • BrickletCO2.THRESHOLD_OPTION_GREATER = '>'
public BrickletCO2.CO2ConcentrationCallbackThreshold getCO2ConcentrationCallbackThreshold()

Returns the threshold as set by setCO2ConcentrationCallbackThreshold().

The following constants are available for this function:

  • BrickletCO2.THRESHOLD_OPTION_OFF = 'x'
  • BrickletCO2.THRESHOLD_OPTION_OUTSIDE = 'o'
  • BrickletCO2.THRESHOLD_OPTION_INSIDE = 'i'
  • BrickletCO2.THRESHOLD_OPTION_SMALLER = '<'
  • BrickletCO2.THRESHOLD_OPTION_GREATER = '>'

The returned object has the public member variables char option, int min and int max.

public void setDebouncePeriod(long debounce)

Sets the period in ms with which the threshold callbacks

are triggered, if the thresholds

keep being reached.

The default value is 100.

public long getDebouncePeriod()

Returns the debounce period as set by setDebouncePeriod().

Callbacks

Callbacks can be registered to receive time critical or recurring data from the device. The registration is done with "set" function of MATLAB. The parameters consist of the IP Connection object, the callback name and the callback function. For example, it looks like this in MATLAB:

function my_callback(e)
    fprintf('Parameter: %s\n', e.param);
end

set(device, 'ExampleCallback', @(h, e) my_callback(e));

Due to a difference in the Octave Java support the "set" function cannot be used in Octave. The registration is done with "add*Callback" functions of the device object. It looks like this in Octave:

function my_callback(e)
    fprintf("Parameter: %s\n", e.param);
end

device.addExampleCallback(@my_callback);

It is possible to add several callbacks and to remove them with the corresponding "remove*Callback" function.

The parameters of the callback are passed to the callback function as fields of the structure e, which is derived from the java.util.EventObject class. The available callback names with corresponding structure fields are described below.

Note

Using callbacks 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 callback BrickletCO2.CO2ConcentrationCallback
Parameters:co2Concentration -- int

This callback is triggered periodically with the period that is set by setCO2ConcentrationCallbackPeriod(). The parameter is the CO2 concentration of the sensor.

The CO2ConcentrationCallback callback is only triggered if the CO2 concentration has changed since the last triggering.

In MATLAB the set() function can be used to register a callback function to this callback.

In Octave a callback function can be added to this callback using the addCO2ConcentrationCallback() function. An added callback function can be removed with the removeCO2ConcentrationCallback() function.

public callback BrickletCO2.CO2ConcentrationReachedCallback
Parameters:co2Concentration -- int

This callback is triggered when the threshold as set by setCO2ConcentrationCallbackThreshold() is reached. The parameter is the CO2 concentration.

If the threshold keeps being reached, the callback is triggered periodically with the period as set by setDebouncePeriod().

In MATLAB the set() function can be used to register a callback function to this callback.

In Octave a callback function can be added to this callback using the addCO2ConcentrationReachedCallback() function. An added callback function can be removed with the removeCO2ConcentrationReachedCallback() function.

Constants

public static final int BrickletCO2.DEVICE_IDENTIFIER

This constant is used to identify a CO2 Bricklet.

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

public static final String BrickletCO2.DEVICE_DISPLAY_NAME

This constant represents the human readable name of a CO2 Bricklet.