JavaScript - Thermocouple Bricklet

This is the description of the JavaScript API bindings for the Thermocouple Bricklet. General information and technical specifications for the Thermocouple 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 Thermocouple Bricklet

var ipcon = new Tinkerforge.IPConnection(); // Create IP connection
var t = new Tinkerforge.BrickletThermocouple(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 temperature
        t.getTemperature(
            function (temperature) {
                console.log('Temperature: ' + temperature/100.0 + ' °C');
            },
            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 Thermocouple Bricklet

var ipcon = new Tinkerforge.IPConnection(); // Create IP connection
var t = new Tinkerforge.BrickletThermocouple(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 temperature callback to 1s (1000ms)
        // Note: The temperature callback is only called every second
        //       if the temperature has changed since the last call!
        t.setTemperatureCallbackPeriod(1000);
    }
);

// Register temperature callback
t.on(Tinkerforge.BrickletThermocouple.CALLBACK_TEMPERATURE,
    // Callback function for temperature callback
    function (temperature) {
        console.log('Temperature: ' + temperature/100.0 + ' °C');
    }
);

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 Thermocouple Bricklet

var ipcon = new Tinkerforge.IPConnection(); // Create IP connection
var t = new Tinkerforge.BrickletThermocouple(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)
        t.setDebouncePeriod(10000);

        // Configure threshold for temperature "greater than 30 °C"
        t.setTemperatureCallbackThreshold('>', 30*100, 0);
    }
);

// Register temperature reached callback
t.on(Tinkerforge.BrickletThermocouple.CALLBACK_TEMPERATURE_REACHED,
    // Callback function for temperature reached callback
    function (temperature) {
        console.log('Temperature: ' + temperature/100.0 + ' °C');
    }
);

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>Thermocouple 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 t = new Tinkerforge.BrickletThermocouple(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 temperature
                        t.getTemperature(
                            function (temperature) {
                                textArea.value += 'Temperature: ' + temperature/100.0 + ' °C\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>Thermocouple 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 t = new Tinkerforge.BrickletThermocouple(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 temperature callback to 1s (1000ms)
                        // Note: The temperature callback is only called every second
                        //       if the temperature has changed since the last call!
                        t.setTemperatureCallbackPeriod(1000);
                    }
                );

                // Register temperature callback
                t.on(Tinkerforge.BrickletThermocouple.CALLBACK_TEMPERATURE,
                    // Callback function for temperature callback
                    function (temperature) {
                        textArea.value += 'Temperature: ' + temperature/100.0 + ' °C\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>Thermocouple 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 t = new Tinkerforge.BrickletThermocouple(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)
                        t.setDebouncePeriod(10000);

                        // Configure threshold for temperature "greater than 30 °C"
                        t.setTemperatureCallbackThreshold('>', 30*100, 0);
                    }
                );

                // Register temperature reached callback
                t.on(Tinkerforge.BrickletThermocouple.CALLBACK_TEMPERATURE_REACHED,
                    // Callback function for temperature reached callback
                    function (temperature) {
                        textArea.value += 'Temperature: ' + temperature/100.0 + ' °C\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
  • IPConnection.ERROR_STREAM_OUT_OF_SYNC = 51

The namespace for the JavaScript bindings is Tinkerforge.*.

Basic Functions

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

Creates an object with the unique device ID uid:

var thermocouple = new BrickletThermocouple("YOUR_DEVICE_UID", ipcon);

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

BrickletThermocouple.getTemperature([returnCallback][, errorCallback])
Callback:
  • temperature -- int

Returns the temperature of the thermocouple. The value is given in °C/100, e.g. a value of 4223 means that a temperature of 42.23 °C is measured.

If you want to get the temperature periodically, it is recommended to use the CALLBACK_TEMPERATURE callback and set the period with setTemperatureCallbackPeriod().

Advanced Functions

BrickletThermocouple.setConfiguration(averaging, thermocoupleType, filter[, returnCallback][, errorCallback])
Parameters:
  • averaging -- int
  • thermocoupleType -- int
  • filter -- int
Callback:

undefined

You can configure averaging size, thermocouple type and frequency filtering.

Available averaging sizes are 1, 2, 4, 8 and 16 samples.

As thermocouple type you can use B, E, J, K, N, R, S and T. If you have a different thermocouple or a custom thermocouple you can also use G8 and G32. With these types the returned value will not be in °C/100, it will be calculated by the following formulas:

  • G8: value = 8 * 1.6 * 2^17 * Vin
  • G32: value = 32 * 1.6 * 2^17 * Vin

where Vin is the thermocouple input voltage.

The frequency filter can be either configured to 50Hz or to 60Hz. You should configure it according to your utility frequency.

The conversion time depends on the averaging and filter configuration, it can be calculated as follows:

  • 60Hz: time = 82 + (samples - 1) * 16.67
  • 50Hz: time = 98 + (samples - 1) * 20

The default configuration is 16 samples, K type and 50Hz.

The following constants are available for this function:

  • BrickletThermocouple.AVERAGING_1 = 1
  • BrickletThermocouple.AVERAGING_2 = 2
  • BrickletThermocouple.AVERAGING_4 = 4
  • BrickletThermocouple.AVERAGING_8 = 8
  • BrickletThermocouple.AVERAGING_16 = 16
  • BrickletThermocouple.TYPE_B = 0
  • BrickletThermocouple.TYPE_E = 1
  • BrickletThermocouple.TYPE_J = 2
  • BrickletThermocouple.TYPE_K = 3
  • BrickletThermocouple.TYPE_N = 4
  • BrickletThermocouple.TYPE_R = 5
  • BrickletThermocouple.TYPE_S = 6
  • BrickletThermocouple.TYPE_T = 7
  • BrickletThermocouple.TYPE_G8 = 8
  • BrickletThermocouple.TYPE_G32 = 9
  • BrickletThermocouple.FILTER_OPTION_50HZ = 0
  • BrickletThermocouple.FILTER_OPTION_60HZ = 1
BrickletThermocouple.getConfiguration([returnCallback][, errorCallback])
Callback:
  • averaging -- int
  • thermocoupleType -- int
  • filter -- int

Returns the configuration as set by setConfiguration().

The following constants are available for this function:

  • BrickletThermocouple.AVERAGING_1 = 1
  • BrickletThermocouple.AVERAGING_2 = 2
  • BrickletThermocouple.AVERAGING_4 = 4
  • BrickletThermocouple.AVERAGING_8 = 8
  • BrickletThermocouple.AVERAGING_16 = 16
  • BrickletThermocouple.TYPE_B = 0
  • BrickletThermocouple.TYPE_E = 1
  • BrickletThermocouple.TYPE_J = 2
  • BrickletThermocouple.TYPE_K = 3
  • BrickletThermocouple.TYPE_N = 4
  • BrickletThermocouple.TYPE_R = 5
  • BrickletThermocouple.TYPE_S = 6
  • BrickletThermocouple.TYPE_T = 7
  • BrickletThermocouple.TYPE_G8 = 8
  • BrickletThermocouple.TYPE_G32 = 9
  • BrickletThermocouple.FILTER_OPTION_50HZ = 0
  • BrickletThermocouple.FILTER_OPTION_60HZ = 1
BrickletThermocouple.getErrorState([returnCallback][, errorCallback])
Callback:
  • overUnder -- boolean
  • openCircuit -- boolean

Returns the current error state. There are two possible errors:

  • Over/Under Voltage and
  • Open Circuit.

Over/Under Voltage happens for voltages below 0V or above 3.3V. In this case it is very likely that your thermocouple is defective. An Open Circuit error indicates that there is no thermocouple connected.

You can use the CALLBACK_ERROR_STATE callback to automatically get triggered when the error state changes.

BrickletThermocouple.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.

BrickletThermocouple.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.

BrickletThermocouple.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:

  • BrickletThermocouple.FUNCTION_SET_TEMPERATURE_CALLBACK_PERIOD = 2
  • BrickletThermocouple.FUNCTION_SET_TEMPERATURE_CALLBACK_THRESHOLD = 4
  • BrickletThermocouple.FUNCTION_SET_DEBOUNCE_PERIOD = 6
  • BrickletThermocouple.FUNCTION_SET_CONFIGURATION = 10
BrickletThermocouple.setResponseExpectedAll(responseExpected)
Parameters:
  • responseExpected -- boolean

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

BrickletThermocouple.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

BrickletThermocouple.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.

BrickletThermocouple.setTemperatureCallbackPeriod(period[, returnCallback][, errorCallback])
Parameters:
  • period -- int
Callback:

undefined

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

The CALLBACK_TEMPERATURE callback is only triggered if the temperature has changed since the last triggering.

The default value is 0.

BrickletThermocouple.getTemperatureCallbackPeriod([returnCallback][, errorCallback])
Callback:
  • period -- int

Returns the period as set by setTemperatureCallbackPeriod().

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

undefined

Sets the thresholds for the CALLBACK_TEMPERATURE_REACHED callback.

The following options are possible:

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

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

The following constants are available for this function:

  • BrickletThermocouple.THRESHOLD_OPTION_OFF = 'x'
  • BrickletThermocouple.THRESHOLD_OPTION_OUTSIDE = 'o'
  • BrickletThermocouple.THRESHOLD_OPTION_INSIDE = 'i'
  • BrickletThermocouple.THRESHOLD_OPTION_SMALLER = '<'
  • BrickletThermocouple.THRESHOLD_OPTION_GREATER = '>'
BrickletThermocouple.getTemperatureCallbackThreshold([returnCallback][, errorCallback])
Callback:
  • option -- char
  • min -- int
  • max -- int

Returns the threshold as set by setTemperatureCallbackThreshold().

The following constants are available for this function:

  • BrickletThermocouple.THRESHOLD_OPTION_OFF = 'x'
  • BrickletThermocouple.THRESHOLD_OPTION_OUTSIDE = 'o'
  • BrickletThermocouple.THRESHOLD_OPTION_INSIDE = 'i'
  • BrickletThermocouple.THRESHOLD_OPTION_SMALLER = '<'
  • BrickletThermocouple.THRESHOLD_OPTION_GREATER = '>'
BrickletThermocouple.setDebouncePeriod(debounce[, returnCallback][, errorCallback])
Parameters:
  • debounce -- int
Callback:

undefined

Sets the period in ms with which the threshold callback

is triggered, if the threshold

keeps being reached.

The default value is 100.

BrickletThermocouple.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:

thermocouple.on(BrickletThermocouple.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.

BrickletThermocouple.CALLBACK_TEMPERATURE
Parameters:
  • temperature -- int

This callback is triggered periodically with the period that is set by setTemperatureCallbackPeriod(). The parameter is the temperature of the thermocouple.

The CALLBACK_TEMPERATURE callback is only triggered if the temperature has changed since the last triggering.

BrickletThermocouple.CALLBACK_TEMPERATURE_REACHED
Parameters:
  • temperature -- int

This callback is triggered when the threshold as set by setTemperatureCallbackThreshold() is reached. The parameter is the temperature of the thermocouple.

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

BrickletThermocouple.CALLBACK_ERROR_STATE
Parameters:
  • overUnder -- boolean
  • openCircuit -- boolean

This Callback is triggered every time the error state changes (see getErrorState()).

Constants

BrickletThermocouple.DEVICE_IDENTIFIER

This constant is used to identify a Thermocouple 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.

BrickletThermocouple.DEVICE_DISPLAY_NAME

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