JavaScript - Laser Range Finder Bricklet 2.0¶

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 Laser Range Finder Bricklet 2.0

var ipcon = new Tinkerforge.IPConnection(); // Create IP connection
var lrf = new Tinkerforge.BrickletLaserRangeFinderV2(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) {
        // Turn laser on and wait 250ms for very first measurement to be ready
        lrf.setEnable(true);

        setTimeout(function () {
            // Get current distance
            lrf.getDistance(
                function (distance) {
                    console.log('Distance: ' + distance + ' cm');
                },
                function (error) {
                    console.log('Error: ' + error);
                }
            );
        }, 250);
    }
);

console.log('Press key to exit');
process.stdin.on('data',
    function (data) {
        // Turn laser off
        lrf.setEnable(false);

        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 Laser Range Finder Bricklet 2.0

var ipcon = new Tinkerforge.IPConnection(); // Create IP connection
var lrf = new Tinkerforge.BrickletLaserRangeFinderV2(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) {
        // Turn laser on and wait 250ms for very first measurement to be ready
        lrf.setEnable(true);

        setTimeout(function () {
            // Set period for distance callback to 0.2s (200ms) without a threshold
            lrf.setDistanceCallbackConfiguration(200, false, 'x', 0, 0);
        }, 250);
    }
);

// Register distance callback
lrf.on(Tinkerforge.BrickletLaserRangeFinderV2.CALLBACK_DISTANCE,
    // Callback function for distance callback
    function (distance) {
        console.log('Distance: ' + distance + ' cm');
    }
);

console.log('Press key to exit');
process.stdin.on('data',
    function (data) {
        // Turn laser off
        lrf.setEnable(false);

        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 Laser Range Finder Bricklet 2.0

var ipcon = new Tinkerforge.IPConnection(); // Create IP connection
var lrf = new Tinkerforge.BrickletLaserRangeFinderV2(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) {
        // Turn laser on and wait 250ms for very first measurement to be ready
        lrf.setEnable(true);

        setTimeout(function () {
            // Configure threshold for distance "greater than 20 cm"
            // with a debounce period of 1s (1000ms)
            lrf.setDistanceCallbackConfiguration(1000, false, '>', 20, 0);
        }, 250);
    }
);

// Register distance callback
lrf.on(Tinkerforge.BrickletLaserRangeFinderV2.CALLBACK_DISTANCE,
    // Callback function for distance callback
    function (distance) {
        console.log('Distance: ' + distance + ' cm');
    }
);

console.log('Press key to exit');
process.stdin.on('data',
    function (data) {
        // Turn laser off
        lrf.setEnable(false);

        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>Laser Range Finder Bricklet 2.0 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 lrf = new Tinkerforge.BrickletLaserRangeFinderV2(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) {
                        // Turn laser on and wait 250ms for very first measurement to be ready
                        lrf.setEnable(true);

                        setTimeout(function () {
                            // Get current distance
                            lrf.getDistance(
                                function (distance) {
                                    textArea.value += 'Distance: ' + distance + ' cm\n';
                                },
                                function (error) {
                                    textArea.value += 'Error: ' + error + '\n';
                                }
                            );
                        }, 250);
                    }
                );
            }
        </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>Laser Range Finder Bricklet 2.0 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 lrf = new Tinkerforge.BrickletLaserRangeFinderV2(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) {
                        // Turn laser on and wait 250ms for very first measurement to be ready
                        lrf.setEnable(true);

                        setTimeout(function () {
                            // Set period for distance callback to 0.2s (200ms) without a threshold
                            lrf.setDistanceCallbackConfiguration(200, false, 'x', 0, 0);
                        }, 250);
                    }
                );

                // Register distance callback
                lrf.on(Tinkerforge.BrickletLaserRangeFinderV2.CALLBACK_DISTANCE,
                    // Callback function for distance callback
                    function (distance) {
                        textArea.value += 'Distance: ' + distance + ' cm\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>Laser Range Finder Bricklet 2.0 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 lrf = new Tinkerforge.BrickletLaserRangeFinderV2(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) {
                        // Turn laser on and wait 250ms for very first measurement to be ready
                        lrf.setEnable(true);

                        setTimeout(function () {
                            // Configure threshold for distance "greater than 20 cm"
                            // with a debounce period of 1s (1000ms)
                            lrf.setDistanceCallbackConfiguration(1000, false, '>', 20, 0);
                        }, 250);
                    }
                );

                // Register distance callback
                lrf.on(Tinkerforge.BrickletLaserRangeFinderV2.CALLBACK_DISTANCE,
                    // Callback function for distance callback
                    function (distance) {
                        textArea.value += 'Distance: ' + distance + ' cm\n';
                        textArea.scrollTop = textArea.scrollHeight;
                    }
                );
            }
        </script>
    </body>
</html>

Basic Functions¶

new BrickletLaserRangeFinderV2(uid, ipcon)¶

Parameters:	uid – Type: string ipcon – Type: IPConnection
Returns:	laserRangeFinderV2 – Type: BrickletLaserRangeFinderV2

Creates an object with the unique device ID uid:

var laserRangeFinderV2 = new BrickletLaserRangeFinderV2("YOUR_DEVICE_UID", ipcon);

This object can then be used after the IP Connection is connected.

BrickletLaserRangeFinderV2.getDistance([returnCallback][, errorCallback])¶

Callback Parameters:	distance – Type: int, Unit: 1 cm, Range: [0 to 4000]
Returns:	undefined

Returns the measured distance.

The laser has to be enabled, see setEnable().

If you want to get the value periodically, it is recommended to use the CALLBACK_DISTANCE callback. You can set the callback configuration with setDistanceCallbackConfiguration().

BrickletLaserRangeFinderV2.getVelocity([returnCallback][, errorCallback])¶

Callback Parameters:	velocity – Type: int, Unit: 1 cm/s, Range: [-12800 to 12700]
Returns:	undefined

Returns the measured velocity. The value has a range of -12800 to 12700 and is given in 1/100 m/s.

The velocity measurement only produces stables results if a fixed measurement rate (see setConfiguration()) is configured. Also the laser has to be enabled, see setEnable().

If you want to get the value periodically, it is recommended to use the CALLBACK_VELOCITY callback. You can set the callback configuration with setVelocityCallbackConfiguration().

BrickletLaserRangeFinderV2.setEnable(enable[, returnCallback][, errorCallback])¶

Parameters:	enable – Type: boolean, Default: false
Callback Parameters:	undefined
Returns:	undefined

Enables the laser of the LIDAR if set to true.

We recommend that you wait 250ms after enabling the laser before the first call of getDistance() to ensure stable measurements.

BrickletLaserRangeFinderV2.getEnable([returnCallback][, errorCallback])¶

Callback Parameters:	enable – Type: boolean, Default: false
Returns:	undefined

Returns the value as set by setEnable().

BrickletLaserRangeFinderV2.setConfiguration(acquisitionCount, enableQuickTermination, thresholdValue, measurementFrequency[, returnCallback][, errorCallback])¶

Parameters:	acquisitionCount – Type: int, Range: [1 to 255], Default: 128 enableQuickTermination – Type: boolean, Default: false thresholdValue – Type: int, Range: [0 to 255], Default: 0 measurementFrequency – Type: int, Unit: 1 Hz, Range: [0, 10 to 500], Default: 0
Callback Parameters:	undefined
Returns:	undefined

The Acquisition Count defines the number of times the Laser Range Finder Bricklet will integrate acquisitions to find a correlation record peak. With a higher count, the Bricklet can measure longer distances. With a lower count, the rate increases. The allowed values are 1-255.

If you set Enable Quick Termination to true, the distance measurement will be terminated early if a high peak was already detected. This means that a higher measurement rate can be achieved and long distances can be measured at the same time. However, the chance of false-positive distance measurements increases.

Normally the distance is calculated with a detection algorithm that uses peak value, signal strength and noise. You can however also define a fixed Threshold Value. Set this to a low value if you want to measure the distance to something that has very little reflection (e.g. glass) and set it to a high value if you want to measure the distance to something with a very high reflection (e.g. mirror). Set this to 0 to use the default algorithm. The other allowed values are 1-255.

Set the Measurement Frequency to force a fixed measurement rate. If set to 0, the Laser Range Finder Bricklet will use the optimal frequency according to the other configurations and the actual measured distance. Since the rate is not fixed in this case, the velocity measurement is not stable. For a stable velocity measurement you should set a fixed measurement frequency. The lower the frequency, the higher is the resolution of the calculated velocity. The allowed values are 10Hz-500Hz (and 0 to turn the fixed frequency off).

The default values for Acquisition Count, Enable Quick Termination, Threshold Value and Measurement Frequency are 128, false, 0 and 0.

BrickletLaserRangeFinderV2.getConfiguration([returnCallback][, errorCallback])¶

Callback Parameters:	acquisitionCount – Type: int, Range: [1 to 255], Default: 128 enableQuickTermination – Type: boolean, Default: false thresholdValue – Type: int, Range: [0 to 255], Default: 0 measurementFrequency – Type: int, Unit: 1 Hz, Range: [0, 10 to 500], Default: 0
Returns:	undefined

Returns the configuration as set by setConfiguration().

BrickletLaserRangeFinderV2.setDistanceLEDConfig(config[, returnCallback][, errorCallback])¶

Parameters:	config – Type: int, Range: See constants, Default: 3
Callback Parameters:	undefined
Returns:	undefined

Configures the distance LED to be either turned off, turned on, blink in heartbeat mode or show the distance (brighter = object is nearer).

The following constants are available for this function:

For config:

• BrickletLaserRangeFinderV2.DISTANCE_LED_CONFIG_OFF = 0
• BrickletLaserRangeFinderV2.DISTANCE_LED_CONFIG_ON = 1
• BrickletLaserRangeFinderV2.DISTANCE_LED_CONFIG_SHOW_HEARTBEAT = 2
• BrickletLaserRangeFinderV2.DISTANCE_LED_CONFIG_SHOW_DISTANCE = 3

BrickletLaserRangeFinderV2.getDistanceLEDConfig([returnCallback][, errorCallback])¶

Callback Parameters:	config – Type: int, Range: See constants, Default: 3
Returns:	undefined

Returns the LED configuration as set by setDistanceLEDConfig()

The following constants are available for this function:

For config:

• BrickletLaserRangeFinderV2.DISTANCE_LED_CONFIG_OFF = 0
• BrickletLaserRangeFinderV2.DISTANCE_LED_CONFIG_ON = 1
• BrickletLaserRangeFinderV2.DISTANCE_LED_CONFIG_SHOW_HEARTBEAT = 2
• BrickletLaserRangeFinderV2.DISTANCE_LED_CONFIG_SHOW_DISTANCE = 3

Advanced Functions¶

BrickletLaserRangeFinderV2.setMovingAverage(distanceAverageLength, velocityAverageLength[, returnCallback][, errorCallback])¶

Parameters:	distanceAverageLength – Type: int, Range: [0 to 255], Default: 10 velocityAverageLength – Type: int, Range: [0 to 255], Default: 10
Callback Parameters:	undefined
Returns:	undefined

Sets the length of a moving averaging for the distance and velocity.

Setting the length to 0 will turn the averaging completely off. With less averaging, there is more noise on the data.

BrickletLaserRangeFinderV2.getMovingAverage([returnCallback][, errorCallback])¶

Callback Parameters:	distanceAverageLength – Type: int, Range: [0 to 255], Default: 10 velocityAverageLength – Type: int, Range: [0 to 255], Default: 10
Returns:	undefined

Returns the length moving average as set by setMovingAverage().

BrickletLaserRangeFinderV2.setOffsetCalibration(offset[, returnCallback][, errorCallback])¶

Parameters:	offset – Type: int, Unit: 1 cm, Range: [-215 to 28767]
Callback Parameters:	undefined
Returns:	undefined

The offset is added to the measured distance. It is saved in non-volatile memory, you only have to set it once.

The Bricklet comes with a per-sensor factory-calibrated offset value, you should not have to call this function.

If you want to re-calibrate the offset you first have to set it to 0. Calculate the offset by measuring the distance to a known distance and set it again.

BrickletLaserRangeFinderV2.getOffsetCalibration([returnCallback][, errorCallback])¶

Callback Parameters:	offset – Type: int, Unit: 1 cm, Range: [-215 to 28767]
Returns:	undefined

Returns the offset value as set by setOffsetCalibration().

BrickletLaserRangeFinderV2.getSPITFPErrorCount([returnCallback][, errorCallback])¶

Callback Parameters:	errorCountAckChecksum – Type: int, Range: [0 to 232 - 1] errorCountMessageChecksum – Type: int, Range: [0 to 232 - 1] errorCountFrame – Type: int, Range: [0 to 232 - 1] errorCountOverflow – Type: int, Range: [0 to 232 - 1]
Returns:	undefined

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.

BrickletLaserRangeFinderV2.setStatusLEDConfig(config[, returnCallback][, errorCallback])¶

Parameters:	config – Type: int, Range: See constants, Default: 3
Callback Parameters:	undefined
Returns:	undefined

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:

For config:

• BrickletLaserRangeFinderV2.STATUS_LED_CONFIG_OFF = 0
• BrickletLaserRangeFinderV2.STATUS_LED_CONFIG_ON = 1
• BrickletLaserRangeFinderV2.STATUS_LED_CONFIG_SHOW_HEARTBEAT = 2
• BrickletLaserRangeFinderV2.STATUS_LED_CONFIG_SHOW_STATUS = 3

BrickletLaserRangeFinderV2.getStatusLEDConfig([returnCallback][, errorCallback])¶

Callback Parameters:	config – Type: int, Range: See constants, Default: 3
Returns:	undefined

Returns the configuration as set by setStatusLEDConfig()

The following constants are available for this function:

For config:

• BrickletLaserRangeFinderV2.STATUS_LED_CONFIG_OFF = 0
• BrickletLaserRangeFinderV2.STATUS_LED_CONFIG_ON = 1
• BrickletLaserRangeFinderV2.STATUS_LED_CONFIG_SHOW_HEARTBEAT = 2
• BrickletLaserRangeFinderV2.STATUS_LED_CONFIG_SHOW_STATUS = 3

BrickletLaserRangeFinderV2.getChipTemperature([returnCallback][, errorCallback])¶

Callback Parameters:	temperature – Type: int, Unit: 1 °C, Range: [-215 to 215 - 1]
Returns:	undefined

Returns the temperature 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.

BrickletLaserRangeFinderV2.reset([returnCallback][, errorCallback])¶

Callback Parameters:	undefined
Returns:	undefined

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!

BrickletLaserRangeFinderV2.getIdentity([returnCallback][, errorCallback])¶

Callback Parameters:

uid – Type: string, Length: up to 8 connectedUid – Type: string, Length: up to 8 position – Type: char, Range: ['a' to 'h', 'z'] hardwareVersion – Type: [int, ...], Length: 3 0: major – Type: int, Range: [0 to 255] 1: minor – Type: int, Range: [0 to 255] 2: revision – Type: int, Range: [0 to 255] firmwareVersion – Type: [int, ...], Length: 3 0: major – Type: int, Range: [0 to 255] 1: minor – Type: int, Range: [0 to 255] 2: revision – Type: int, Range: [0 to 255] deviceIdentifier – Type: int, Range: [0 to 216 - 1]

Returns:

undefined

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', 'd', 'e', 'f', 'g' or 'h' (Bricklet Port). A Bricklet connected to an Isolator Bricklet is always at position 'z'.

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

Callback Configuration Functions¶

BrickletLaserRangeFinderV2.on(callback_id, function[, errorCallback])¶

Parameters:	callback_id – Type: int function – Type: function
Returns:	undefined

Registers the given function with the given callback_id.

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

BrickletLaserRangeFinderV2.setDistanceCallbackConfiguration(period, valueHasToChange, option, min, max[, returnCallback][, errorCallback])¶

Parameters:	period – Type: int, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0 valueHasToChange – Type: boolean, Default: false option – Type: char, Range: See constants, Default: 'x' min – Type: int, Unit: 1 cm, Range: [-215 to 215 - 1], Default: 0 max – Type: int, Unit: 1 cm, Range: [-215 to 215 - 1], Default: 0
Callback Parameters:	undefined
Returns:	undefined

The period is the period with which the CALLBACK_DISTANCE callback is triggered periodically. A value of 0 turns the callback off.

If the value has to change-parameter is set to true, the callback is only triggered after the value has changed. If the value didn't change within the period, the callback is triggered immediately on change.

If it is set to false, the callback is continuously triggered with the period, independent of the value.

It is furthermore possible to constrain the callback with thresholds.

The option-parameter together with min/max sets a threshold for the CALLBACK_DISTANCE callback.

The following options are possible:

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

If the option is set to 'x' (threshold turned off) the callback is triggered with the fixed period.

The following constants are available for this function:

For option:

• BrickletLaserRangeFinderV2.THRESHOLD_OPTION_OFF = 'x'
• BrickletLaserRangeFinderV2.THRESHOLD_OPTION_OUTSIDE = 'o'
• BrickletLaserRangeFinderV2.THRESHOLD_OPTION_INSIDE = 'i'
• BrickletLaserRangeFinderV2.THRESHOLD_OPTION_SMALLER = '<'
• BrickletLaserRangeFinderV2.THRESHOLD_OPTION_GREATER = '>'

BrickletLaserRangeFinderV2.getDistanceCallbackConfiguration([returnCallback][, errorCallback])¶

Callback Parameters:	period – Type: int, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0 valueHasToChange – Type: boolean, Default: false option – Type: char, Range: See constants, Default: 'x' min – Type: int, Unit: 1 cm, Range: [-215 to 215 - 1], Default: 0 max – Type: int, Unit: 1 cm, Range: [-215 to 215 - 1], Default: 0
Returns:	undefined

Returns the callback configuration as set by setDistanceCallbackConfiguration().

The following constants are available for this function:

For option:

• BrickletLaserRangeFinderV2.THRESHOLD_OPTION_OFF = 'x'
• BrickletLaserRangeFinderV2.THRESHOLD_OPTION_OUTSIDE = 'o'
• BrickletLaserRangeFinderV2.THRESHOLD_OPTION_INSIDE = 'i'
• BrickletLaserRangeFinderV2.THRESHOLD_OPTION_SMALLER = '<'
• BrickletLaserRangeFinderV2.THRESHOLD_OPTION_GREATER = '>'

BrickletLaserRangeFinderV2.setVelocityCallbackConfiguration(period, valueHasToChange, option, min, max[, returnCallback][, errorCallback])¶

Parameters:	period – Type: int, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0 valueHasToChange – Type: boolean, Default: false option – Type: char, Range: See constants, Default: 'x' min – Type: int, Unit: 1 cm/s, Range: [-215 to 215 - 1], Default: 0 max – Type: int, Unit: 1 cm/s, Range: [-215 to 215 - 1], Default: 0
Callback Parameters:	undefined
Returns:	undefined

The period is the period with which the CALLBACK_VELOCITY callback is triggered periodically. A value of 0 turns the callback off.

If the value has to change-parameter is set to true, the callback is only triggered after the value has changed. If the value didn't change within the period, the callback is triggered immediately on change.

If it is set to false, the callback is continuously triggered with the period, independent of the value.

It is furthermore possible to constrain the callback with thresholds.

The option-parameter together with min/max sets a threshold for the CALLBACK_VELOCITY callback.

The following options are possible:

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

If the option is set to 'x' (threshold turned off) the callback is triggered with the fixed period.

The following constants are available for this function:

For option:

• BrickletLaserRangeFinderV2.THRESHOLD_OPTION_OFF = 'x'
• BrickletLaserRangeFinderV2.THRESHOLD_OPTION_OUTSIDE = 'o'
• BrickletLaserRangeFinderV2.THRESHOLD_OPTION_INSIDE = 'i'
• BrickletLaserRangeFinderV2.THRESHOLD_OPTION_SMALLER = '<'
• BrickletLaserRangeFinderV2.THRESHOLD_OPTION_GREATER = '>'

BrickletLaserRangeFinderV2.getVelocityCallbackConfiguration([returnCallback][, errorCallback])¶

Callback Parameters:	period – Type: int, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0 valueHasToChange – Type: boolean, Default: false option – Type: char, Range: See constants, Default: 'x' min – Type: int, Unit: 1 cm/s, Range: [-215 to 215 - 1], Default: 0 max – Type: int, Unit: 1 cm/s, Range: [-215 to 215 - 1], Default: 0
Returns:	undefined

Returns the callback configuration as set by setVelocityCallbackConfiguration().

The following constants are available for this function:

For option:

• BrickletLaserRangeFinderV2.THRESHOLD_OPTION_OFF = 'x'
• BrickletLaserRangeFinderV2.THRESHOLD_OPTION_OUTSIDE = 'o'
• BrickletLaserRangeFinderV2.THRESHOLD_OPTION_INSIDE = 'i'
• BrickletLaserRangeFinderV2.THRESHOLD_OPTION_SMALLER = '<'
• BrickletLaserRangeFinderV2.THRESHOLD_OPTION_GREATER = '>'

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:

laserRangeFinderV2.on(BrickletLaserRangeFinderV2.CALLBACK_EXAMPLE,
    function (param) {
        console.log(param);
    }
);

The available constants with inherent number and type of parameters are described below.

BrickletLaserRangeFinderV2.CALLBACK_DISTANCE¶

Callback Parameters:	distance – Type: int, Unit: 1 cm, Range: [0 to 4000]

This callback is triggered periodically according to the configuration set by setDistanceCallbackConfiguration().

The parameter is the same as getDistance().

BrickletLaserRangeFinderV2.CALLBACK_VELOCITY¶

Callback Parameters:	velocity – Type: int, Unit: 1 cm/s, Range: [-12800 to 12700]

This callback is triggered periodically according to the configuration set by setVelocityCallbackConfiguration().

The parameter is the same as getVelocity().

Virtual Functions¶

Virtual functions don't communicate with the device itself, but operate only on the API bindings device object. They can be called without the corresponding IP Connection object being connected.

BrickletLaserRangeFinderV2.getAPIVersion()¶

Returns:	apiVersion – Type: [int, ...], Length: 3 0: major – Type: int, Range: [0 to 255] 1: minor – Type: int, Range: [0 to 255] 2: revision – Type: int, Range: [0 to 255]

Returns the version of the API definition 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.

BrickletLaserRangeFinderV2.getResponseExpected(functionId[, errorCallback])¶

Parameters:	functionId – Type: int, Range: See constants
Returns:	responseExpected – 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 sent and errors are silently ignored, because they cannot be detected.

The following constants are available for this function:

For function_id:

• BrickletLaserRangeFinderV2.FUNCTION_SET_DISTANCE_CALLBACK_CONFIGURATION = 2
• BrickletLaserRangeFinderV2.FUNCTION_SET_VELOCITY_CALLBACK_CONFIGURATION = 6
• BrickletLaserRangeFinderV2.FUNCTION_SET_ENABLE = 9
• BrickletLaserRangeFinderV2.FUNCTION_SET_CONFIGURATION = 11
• BrickletLaserRangeFinderV2.FUNCTION_SET_MOVING_AVERAGE = 13
• BrickletLaserRangeFinderV2.FUNCTION_SET_OFFSET_CALIBRATION = 15
• BrickletLaserRangeFinderV2.FUNCTION_SET_DISTANCE_LED_CONFIG = 17
• BrickletLaserRangeFinderV2.FUNCTION_SET_WRITE_FIRMWARE_POINTER = 237
• BrickletLaserRangeFinderV2.FUNCTION_SET_STATUS_LED_CONFIG = 239
• BrickletLaserRangeFinderV2.FUNCTION_RESET = 243
• BrickletLaserRangeFinderV2.FUNCTION_WRITE_UID = 248

BrickletLaserRangeFinderV2.setResponseExpected(functionId, responseExpected[, errorCallback])¶

Parameters:	functionId – Type: int, Range: See constants responseExpected – Type: boolean
Returns:	undefined

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 sent and errors are silently ignored, because they cannot be detected.

The following constants are available for this function:

For function_id:

• BrickletLaserRangeFinderV2.FUNCTION_SET_DISTANCE_CALLBACK_CONFIGURATION = 2
• BrickletLaserRangeFinderV2.FUNCTION_SET_VELOCITY_CALLBACK_CONFIGURATION = 6
• BrickletLaserRangeFinderV2.FUNCTION_SET_ENABLE = 9
• BrickletLaserRangeFinderV2.FUNCTION_SET_CONFIGURATION = 11
• BrickletLaserRangeFinderV2.FUNCTION_SET_MOVING_AVERAGE = 13
• BrickletLaserRangeFinderV2.FUNCTION_SET_OFFSET_CALIBRATION = 15
• BrickletLaserRangeFinderV2.FUNCTION_SET_DISTANCE_LED_CONFIG = 17
• BrickletLaserRangeFinderV2.FUNCTION_SET_WRITE_FIRMWARE_POINTER = 237
• BrickletLaserRangeFinderV2.FUNCTION_SET_STATUS_LED_CONFIG = 239
• BrickletLaserRangeFinderV2.FUNCTION_RESET = 243
• BrickletLaserRangeFinderV2.FUNCTION_WRITE_UID = 248

BrickletLaserRangeFinderV2.setResponseExpectedAll(responseExpected)¶

Parameters:	responseExpected – Type: boolean
Returns:	undefined

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

Internal Functions¶

Internal functions are used for maintenance tasks such as flashing a new firmware of changing the UID of a Bricklet. These task should be performed using Brick Viewer instead of using the internal functions directly.

BrickletLaserRangeFinderV2.setBootloaderMode(mode[, returnCallback][, errorCallback])¶

Parameters:	mode – Type: int, Range: See constants
Callback Parameters:	status – Type: int, Range: See constants
Returns:	undefined

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:

For mode:

• BrickletLaserRangeFinderV2.BOOTLOADER_MODE_BOOTLOADER = 0
• BrickletLaserRangeFinderV2.BOOTLOADER_MODE_FIRMWARE = 1
• BrickletLaserRangeFinderV2.BOOTLOADER_MODE_BOOTLOADER_WAIT_FOR_REBOOT = 2
• BrickletLaserRangeFinderV2.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_REBOOT = 3
• BrickletLaserRangeFinderV2.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_ERASE_AND_REBOOT = 4

For status:

• BrickletLaserRangeFinderV2.BOOTLOADER_STATUS_OK = 0
• BrickletLaserRangeFinderV2.BOOTLOADER_STATUS_INVALID_MODE = 1
• BrickletLaserRangeFinderV2.BOOTLOADER_STATUS_NO_CHANGE = 2
• BrickletLaserRangeFinderV2.BOOTLOADER_STATUS_ENTRY_FUNCTION_NOT_PRESENT = 3
• BrickletLaserRangeFinderV2.BOOTLOADER_STATUS_DEVICE_IDENTIFIER_INCORRECT = 4
• BrickletLaserRangeFinderV2.BOOTLOADER_STATUS_CRC_MISMATCH = 5

BrickletLaserRangeFinderV2.getBootloaderMode([returnCallback][, errorCallback])¶

Callback Parameters:	mode – Type: int, Range: See constants
Returns:	undefined

Returns the current bootloader mode, see setBootloaderMode().

The following constants are available for this function:

For mode:

• BrickletLaserRangeFinderV2.BOOTLOADER_MODE_BOOTLOADER = 0
• BrickletLaserRangeFinderV2.BOOTLOADER_MODE_FIRMWARE = 1
• BrickletLaserRangeFinderV2.BOOTLOADER_MODE_BOOTLOADER_WAIT_FOR_REBOOT = 2
• BrickletLaserRangeFinderV2.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_REBOOT = 3
• BrickletLaserRangeFinderV2.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_ERASE_AND_REBOOT = 4

BrickletLaserRangeFinderV2.setWriteFirmwarePointer(pointer[, returnCallback][, errorCallback])¶

Parameters:	pointer – Type: int, Unit: 1 B, Range: [0 to 232 - 1]
Callback Parameters:	undefined
Returns:	undefined

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.

BrickletLaserRangeFinderV2.writeFirmware(data[, returnCallback][, errorCallback])¶

Parameters:	data – Type: [int, ...], Length: 64, Range: [0 to 255]
Callback Parameters:	status – Type: int, Range: [0 to 255]
Returns:	undefined

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.

BrickletLaserRangeFinderV2.writeUID(uid[, returnCallback][, errorCallback])¶

Parameters:	uid – Type: int, Range: [0 to 232 - 1]
Callback Parameters:	undefined
Returns:	undefined

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.

BrickletLaserRangeFinderV2.readUID([returnCallback][, errorCallback])¶

Callback Parameters:	uid – Type: int, Range: [0 to 232 - 1]
Returns:	undefined

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

Constants¶

BrickletLaserRangeFinderV2.DEVICE_IDENTIFIER¶

This constant is used to identify a Laser Range Finder Bricklet 2.0.

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.

BrickletLaserRangeFinderV2.DEVICE_DISPLAY_NAME¶

This constant represents the human readable name of a Laser Range Finder Bricklet 2.0.