Software / API Bindings / JavaScript / API Reference and Examples / Bricklets / RGB LED Bricklet

JavaScript - RGB LED Bricklet¶

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

var Tinkerforge = require('tinkerforge');

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

var ipcon = new Tinkerforge.IPConnection(); // Create IP connection
var rl = new Tinkerforge.BrickletRGBLED(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 light blue color
        rl.setRGBValue(0, 170, 234);
    }
);

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)

<!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>RGB LED 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 rl = new Tinkerforge.BrickletRGBLED(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 light blue color
                        rl.setRGBValue(0, 170, 234);
                    }
                );
            }
        </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 BrickletRGBLED(uid, ipcon)¶

Parameters:	uid -- string ipcon -- IPConnection

Creates an object with the unique device ID uid:

var rgbLED = new BrickletRGBLED("YOUR_DEVICE_UID", ipcon);

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

BrickletRGBLED.setRGBValue(r, g, b[, returnCallback][, errorCallback])¶

Parameters:	r -- int g -- int b -- int
Callback:	undefined

Sets the r, g and b values for the LED. Each value can be between 0 and 255.

BrickletRGBLED.getRGBValue([returnCallback][, errorCallback])¶

Callback:	r -- int g -- int b -- int

Returns the r, g and b values of the LED as set by setRGBValue().

Advanced Functions¶

BrickletRGBLED.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.

BrickletRGBLED.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.

BrickletRGBLED.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.

The following function ID constants are available for this function:

BrickletRGBLED.FUNCTION_SET_RGB_VALUE = 1

BrickletRGBLED.setResponseExpectedAll(responseExpected)¶

Parameters:	responseExpected -- boolean

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

BrickletRGBLED.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.

Constants¶

BrickletRGBLED.DEVICE_IDENTIFIER¶

This constant is used to identify a RGB LED Bricklet.

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

BrickletRGBLED.DEVICE_DISPLAY_NAME¶: This constant represents the human readable name of a RGB LED Bricklet.