JavaScript - CO2 Bricklet

This is the description of the JavaScript 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 JavaScript API bindings is part of their general description.

Examples

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

Simple (Node.js)

Download (ExampleSimple.js)

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var Tinkerforge = require('tinkerforge');

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

var ipcon = new Tinkerforge.IPConnection(); // Create IP connection
var co2 = new Tinkerforge.BrickletCO2(UID, ipcon); // Create device object

ipcon.connect(HOST, PORT,
    function (error) {
        console.log('Error: ' + error);
    }
); // Connect to brickd
// Don't use device before ipcon is connected

ipcon.on(Tinkerforge.IPConnection.CALLBACK_CONNECTED,
    function (connectReason) {
        // Get current CO2 concentration
        co2.getCO2Concentration(
            function (co2Concentration) {
                console.log('CO2 Concentration: ' + co2Concentration + ' ppm');
            },
            function (error) {
                console.log('Error: ' + error);
            }
        );
    }
);

console.log('Press key to exit');
process.stdin.on('data',
    function (data) {
        ipcon.disconnect();
        process.exit(0);
    }
);

Callback (Node.js)

Download (ExampleCallback.js)

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var Tinkerforge = require('tinkerforge');

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

var ipcon = new Tinkerforge.IPConnection(); // Create IP connection
var co2 = new Tinkerforge.BrickletCO2(UID, ipcon); // Create device object

ipcon.connect(HOST, PORT,
    function (error) {
        console.log('Error: ' + error);
    }
); // Connect to brickd
// Don't use device before ipcon is connected

ipcon.on(Tinkerforge.IPConnection.CALLBACK_CONNECTED,
    function (connectReason) {
        // 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);
    }
);

// Register CO2 concentration callback
co2.on(Tinkerforge.BrickletCO2.CALLBACK_CO2_CONCENTRATION,
    // Callback function for CO2 concentration callback
    function (co2Concentration) {
        console.log('CO2 Concentration: ' + co2Concentration + ' ppm');
    }
);

console.log('Press key to exit');
process.stdin.on('data',
    function (data) {
        ipcon.disconnect();
        process.exit(0);
    }
);

Threshold (Node.js)

Download (ExampleThreshold.js)

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var Tinkerforge = require('tinkerforge');

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

var ipcon = new Tinkerforge.IPConnection(); // Create IP connection
var co2 = new Tinkerforge.BrickletCO2(UID, ipcon); // Create device object

ipcon.connect(HOST, PORT,
    function (error) {
        console.log('Error: ' + error);
    }
); // Connect to brickd
// Don't use device before ipcon is connected

ipcon.on(Tinkerforge.IPConnection.CALLBACK_CONNECTED,
    function (connectReason) {
        // Get threshold callbacks with a debounce time of 10 seconds (10000ms)
        co2.setDebouncePeriod(10000);

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

// Register CO2 concentration reached callback
co2.on(Tinkerforge.BrickletCO2.CALLBACK_CO2_CONCENTRATION_REACHED,
    // Callback function for CO2 concentration reached callback
    function (co2Concentration) {
        console.log('CO2 Concentration: ' + co2Concentration + ' ppm');
    }
);

console.log('Press key to exit');
process.stdin.on('data',
    function (data) {
        ipcon.disconnect();
        process.exit(0);
    }
);

Simple (HTML)

Download (ExampleSimple.html), Test (ExampleSimple.html)

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<!DOCTYPE html>
<html>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <head>
        <title>Tinkerforge | JavaScript Example</title>
    </head>
    <body>
        <div style="text-align:center;">
            <h1>CO2 Bricklet Simple Example</h1>
            <p>
                <input value="localhost" id="host" type="text" size="20">:
                <input value="4280" id="port" type="text" size="5">,
                <input value="uid" id="uid" type="text" size="5">
                <input value="Start Example" id="start" type="button" onclick="startExample();">
            </p>
            <p>
                <textarea readonly id="text" cols="80" rows="24" style="resize:none;"
                          >Press "Start Example" to begin ...</textarea>
            </p>
        </div>
        <script src="./Tinkerforge.js" type='text/javascript'></script>
        <script type='text/javascript'>
            var ipcon;
            var textArea = document.getElementById("text");
            function startExample() {
                textArea.value = "";
                var HOST = document.getElementById("host").value;
                var PORT = parseInt(document.getElementById("port").value);
                var UID = document.getElementById("uid").value;
                if(ipcon !== undefined) {
                    ipcon.disconnect();
                }
                ipcon = new Tinkerforge.IPConnection(); // Create IP connection
                var co2 = new Tinkerforge.BrickletCO2(UID, ipcon); // Create device object
                ipcon.connect(HOST, PORT,
                    function(error) {
                        textArea.value += 'Error: ' + error + '\n';
                    }
                ); // Connect to brickd
                // Don't use device before ipcon is connected

                ipcon.on(Tinkerforge.IPConnection.CALLBACK_CONNECTED,
                    function (connectReason) {
                        // Get current CO2 concentration
                        co2.getCO2Concentration(
                            function (co2Concentration) {
                                textArea.value += 'CO2 Concentration: ' + co2Concentration + ' ppm\n';
                            },
                            function (error) {
                                textArea.value += 'Error: ' + error + '\n';
                            }
                        );
                    }
                );
            }
        </script>
    </body>
</html>

Callback (HTML)

Download (ExampleCallback.html), Test (ExampleCallback.html)

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<!DOCTYPE html>
<html>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <head>
        <title>Tinkerforge | JavaScript Example</title>
    </head>
    <body>
        <div style="text-align:center;">
            <h1>CO2 Bricklet Callback Example</h1>
            <p>
                <input value="localhost" id="host" type="text" size="20">:
                <input value="4280" id="port" type="text" size="5">,
                <input value="uid" id="uid" type="text" size="5">
                <input value="Start Example" id="start" type="button" onclick="startExample();">
            </p>
            <p>
                <textarea readonly id="text" cols="80" rows="24" style="resize:none;"
                          >Press "Start Example" to begin ...</textarea>
            </p>
        </div>
        <script src="./Tinkerforge.js" type='text/javascript'></script>
        <script type='text/javascript'>
            var ipcon;
            var textArea = document.getElementById("text");
            function startExample() {
                textArea.value = "";
                var HOST = document.getElementById("host").value;
                var PORT = parseInt(document.getElementById("port").value);
                var UID = document.getElementById("uid").value;
                if(ipcon !== undefined) {
                    ipcon.disconnect();
                }
                ipcon = new Tinkerforge.IPConnection(); // Create IP connection
                var co2 = new Tinkerforge.BrickletCO2(UID, ipcon); // Create device object
                ipcon.connect(HOST, PORT,
                    function(error) {
                        textArea.value += 'Error: ' + error + '\n';
                    }
                ); // Connect to brickd
                // Don't use device before ipcon is connected

                ipcon.on(Tinkerforge.IPConnection.CALLBACK_CONNECTED,
                    function (connectReason) {
                        // 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);
                    }
                );

                // Register CO2 concentration callback
                co2.on(Tinkerforge.BrickletCO2.CALLBACK_CO2_CONCENTRATION,
                    // Callback function for CO2 concentration callback
                    function (co2Concentration) {
                        textArea.value += 'CO2 Concentration: ' + co2Concentration + ' ppm\n';
                        textArea.scrollTop = textArea.scrollHeight;
                    }
                );
            }
        </script>
    </body>
</html>

Threshold (HTML)

Download (ExampleThreshold.html), Test (ExampleThreshold.html)

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<!DOCTYPE html>
<html>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <head>
        <title>Tinkerforge | JavaScript Example</title>
    </head>
    <body>
        <div style="text-align:center;">
            <h1>CO2 Bricklet Threshold Example</h1>
            <p>
                <input value="localhost" id="host" type="text" size="20">:
                <input value="4280" id="port" type="text" size="5">,
                <input value="uid" id="uid" type="text" size="5">
                <input value="Start Example" id="start" type="button" onclick="startExample();">
            </p>
            <p>
                <textarea readonly id="text" cols="80" rows="24" style="resize:none;"
                          >Press "Start Example" to begin ...</textarea>
            </p>
        </div>
        <script src="./Tinkerforge.js" type='text/javascript'></script>
        <script type='text/javascript'>
            var ipcon;
            var textArea = document.getElementById("text");
            function startExample() {
                textArea.value = "";
                var HOST = document.getElementById("host").value;
                var PORT = parseInt(document.getElementById("port").value);
                var UID = document.getElementById("uid").value;
                if(ipcon !== undefined) {
                    ipcon.disconnect();
                }
                ipcon = new Tinkerforge.IPConnection(); // Create IP connection
                var co2 = new Tinkerforge.BrickletCO2(UID, ipcon); // Create device object
                ipcon.connect(HOST, PORT,
                    function(error) {
                        textArea.value += 'Error: ' + error + '\n';
                    }
                ); // Connect to brickd
                // Don't use device before ipcon is connected

                ipcon.on(Tinkerforge.IPConnection.CALLBACK_CONNECTED,
                    function (connectReason) {
                        // Get threshold callbacks with a debounce time of 10 seconds (10000ms)
                        co2.setDebouncePeriod(10000);

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

                // Register CO2 concentration reached callback
                co2.on(Tinkerforge.BrickletCO2.CALLBACK_CO2_CONCENTRATION_REACHED,
                    // Callback function for CO2 concentration reached callback
                    function (co2Concentration) {
                        textArea.value += 'CO2 Concentration: ' + co2Concentration + ' ppm\n';
                        textArea.scrollTop = textArea.scrollHeight;
                    }
                );
            }
        </script>
    </body>
</html>

API

Generally, every method of the JavaScript bindings can take two optional parameters, returnCallback and errorCallback. These are two user defined callback functions. The returnCallback is called with the return values as parameters, if the method returns something. The errorCallback is called with an error code in case of an error. The error code can be one of the following values:

  • IPConnection.ERROR_ALREADY_CONNECTED = 11
  • IPConnection.ERROR_NOT_CONNECTED = 12
  • IPConnection.ERROR_CONNECT_FAILED = 13
  • IPConnection.ERROR_INVALID_FUNCTION_ID = 21
  • IPConnection.ERROR_TIMEOUT = 31
  • IPConnection.ERROR_INVALID_PARAMETER = 41
  • IPConnection.ERROR_FUNCTION_NOT_SUPPORTED = 42
  • IPConnection.ERROR_UNKNOWN_ERROR = 43

The namespace for the JavaScript bindings is Tinkerforge.*.

Basic Functions

new BrickletCO2(uid, ipcon)
Parameters:
  • uid -- string
  • ipcon -- IPConnection

Creates an object with the unique device ID uid:

var co2 = new BrickletCO2("YOUR_DEVICE_UID", ipcon);

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

BrickletCO2.getCO2Concentration([returnCallback][, errorCallback])
Callback:
  • co2Concentration -- int

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 CALLBACK_CO2_CONCENTRATION callback and set the period with setCO2ConcentrationCallbackPeriod().

Advanced Functions

BrickletCO2.getAPIVersion()
Return type:[int, int, int]

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.

BrickletCO2.getResponseExpected(functionId[, errorCallback])
Parameters:
  • functionId -- int
Return type:

boolean

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.

BrickletCO2.setResponseExpected(functionId, responseExpected[, errorCallback])
Parameters:
  • functionId -- int
  • responseExpected -- boolean

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
BrickletCO2.setResponseExpectedAll(responseExpected)
Parameters:
  • responseExpected -- boolean

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

BrickletCO2.getIdentity([returnCallback][, errorCallback])
Callback:
  • uid -- string
  • connectedUid -- string
  • position -- char
  • hardwareVersion -- [int, int, int]
  • firmwareVersion -- [int, int, int]
  • deviceIdentifier -- int

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.

Callback Configuration Functions

BrickletCO2.on(callback_id, function)
Parameters:
  • callback_id -- int
  • function -- function

Registers the given function with the given callback_id.

The available callback IDs with corresponding function signatures are listed below.

BrickletCO2.setCO2ConcentrationCallbackPeriod(period[, returnCallback][, errorCallback])
Parameters:
  • period -- int
Callback:

undefined

Sets the period in ms with which the CALLBACK_CO2_CONCENTRATION callback is triggered periodically. A value of 0 turns the callback off.

The CALLBACK_CO2_CONCENTRATION callback is only triggered if the CO2 concentration has changed since the last triggering.

The default value is 0.

BrickletCO2.getCO2ConcentrationCallbackPeriod([returnCallback][, errorCallback])
Callback:
  • period -- int

Returns the period as set by setCO2ConcentrationCallbackPeriod().

BrickletCO2.setCO2ConcentrationCallbackThreshold(option, min, max[, returnCallback][, errorCallback])
Parameters:
  • option -- char
  • min -- int
  • max -- int
Callback:

undefined

Sets the thresholds for the CALLBACK_CO2_CONCENTRATION_REACHED 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 = '>'
BrickletCO2.getCO2ConcentrationCallbackThreshold([returnCallback][, errorCallback])
Callback:
  • option -- char
  • min -- int
  • max -- int

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 = '>'
BrickletCO2.setDebouncePeriod(debounce[, returnCallback][, errorCallback])
Parameters:
  • debounce -- int
Callback:

undefined

Sets the period in ms with which the threshold callbacks

are triggered, if the thresholds

keep being reached.

The default value is 100.

BrickletCO2.getDebouncePeriod([returnCallback][, errorCallback])
Callback:
  • debounce -- int

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 the on() function of the device object. The first parameter is the callback ID and the second parameter the callback function:

co2.on(BrickletCO2.CALLBACK_EXAMPLE,
    function (param) {
        console.log(param);
    }
);

The available constants with inherent number and type of parameters 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.

BrickletCO2.CALLBACK_CO2_CONCENTRATION
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 CALLBACK_CO2_CONCENTRATION callback is only triggered if the CO2 concentration has changed since the last triggering.

BrickletCO2.CALLBACK_CO2_CONCENTRATION_REACHED
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().

Constants

BrickletCO2.DEVICE_IDENTIFIER

This constant is used to identify a CO2 Bricklet.

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

BrickletCO2.DEVICE_DISPLAY_NAME

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