Perl - Piezo Speaker Bricklet¶

Beep¶

Download (example_beep.pl)

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#!/usr/bin/perl

use strict;
use Tinkerforge::IPConnection;
use Tinkerforge::BrickletPiezoSpeaker;

use constant HOST => 'localhost';
use constant PORT => 4223;
use constant UID => 'XYZ'; # Change XYZ to the UID of your Piezo Speaker Bricklet

my $ipcon = Tinkerforge::IPConnection->new(); # Create IP connection
my $ps = Tinkerforge::BrickletPiezoSpeaker->new(&UID, $ipcon); # Create device object

$ipcon->connect(&HOST, &PORT); # Connect to brickd
# Don't use device before ipcon is connected

# Make 2 second beep with a frequency of 1kHz
$ps->beep(2000, 1000);

print "Press key to exit\n";
<STDIN>;
$ipcon->disconnect();

Morse Code¶

Download (example_morse_code.pl)

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#!/usr/bin/perl

use strict;
use Tinkerforge::IPConnection;
use Tinkerforge::BrickletPiezoSpeaker;

use constant HOST => 'localhost';
use constant PORT => 4223;
use constant UID => 'XYZ'; # Change XYZ to the UID of your Piezo Speaker Bricklet

my $ipcon = Tinkerforge::IPConnection->new(); # Create IP connection
my $ps = Tinkerforge::BrickletPiezoSpeaker->new(&UID, $ipcon); # Create device object

$ipcon->connect(&HOST, &PORT); # Connect to brickd
# Don't use device before ipcon is connected

# Morse SOS with a frequency of 2kHz
$ps->morse_code("... --- ...", 2000);

print "Press key to exit\n";
<STDIN>;
$ipcon->disconnect();

Basic Functions¶

BrickletPiezoSpeaker->new($uid, $ipcon)¶

Parameters:	$uid – Type: string $ipcon – Type: IPConnection
Returns:	$piezo_speaker – Type: BrickletPiezoSpeaker

Creates an object with the unique device ID $uid:

$piezo_speaker = BrickletPiezoSpeaker->new("YOUR_DEVICE_UID", $ipcon);

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

BrickletPiezoSpeaker->beep($duration, $frequency)¶

Parameters:	$duration – Type: int, Unit: 1 ms, Range: [0 to 232 - 1] with constants $frequency – Type: int, Unit: 1 Hz, Range: [585 to 7100]
Returns:	undef

Beeps with the given frequency for the given duration.

Changed in version 2.0.2 (Plugin): A duration of 0 stops the current beep if any, the frequency parameter is ignored. A duration of 4294967295 results in an infinite beep.

The Piezo Speaker Bricklet can only approximate the frequency, it will play the best possible match by applying the calibration (see calibrate()).

The following constants are available for this function:

For $duration:

• BrickletPiezoSpeaker->BEEP_DURATION_OFF = 0
• BrickletPiezoSpeaker->BEEP_DURATION_INFINITE = 4294967295

BrickletPiezoSpeaker->morse_code($morse, $frequency)¶

Parameters:	$morse – Type: string, Length: up to 60 $frequency – Type: int, Unit: 1 Hz, Range: [585 to 7100]
Returns:	undef

Sets morse code that will be played by the piezo buzzer. The morse code is given as a string consisting of "." (dot), "-" (minus) and " " (space) for dits, dahs and pauses. Every other character is ignored.

For example: If you set the string "...---...", the piezo buzzer will beep nine times with the durations "short short short long long long short short short".

Advanced Functions¶

BrickletPiezoSpeaker->calibrate()¶

Returns:	$calibration – Type: bool

The Piezo Speaker Bricklet can play 512 different tones. This function plays each tone and measures the exact frequency back. The result is a mapping between setting value and frequency. This mapping is stored in the EEPROM and loaded on startup.

The Bricklet should come calibrated, you only need to call this function (once) every time you reflash the Bricklet plugin.

Returns true after the calibration finishes.

BrickletPiezoSpeaker->get_identity()¶

Return Array:

0: $uid – Type: string, Length: up to 8 1: $connected_uid – Type: string, Length: up to 8 2: $position – Type: char, Range: ['a' to 'h', 'z'] 3: \@hardware_version – 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] 4: \@firmware_version – 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] 5: $device_identifier – Type: int, Range: [0 to 216 - 1]

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¶

BrickletPiezoSpeaker->register_callback($callback_id, $function)¶

Parameters:	$callback_id – Type: int $function – Type: string
Returns:	undef

Registers the given $function name with the given $callback_id.

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

Callbacks¶

Callbacks can be registered to receive time critical or recurring data from the device. The registration is done with the register_callback() function of the device object. The first parameter is the callback ID and the second parameter the callback function name:

sub my_callback
{
    print "@_[0]";
}

$piezo_speaker->register_callback(BrickletPiezoSpeaker->CALLBACK_EXAMPLE, 'my_callback')

The callback function will be called from an internal thread of the IP Connection. In contrast to many other programming languages, variables are not automatically shared between threads in Perl. If you want to share a global variable between a callback function and the rest for your program it has to be marked as :shared. See the documentation of the threads::shared Perl module for more details.

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

BrickletPiezoSpeaker->CALLBACK_BEEP_FINISHED¶

Callback Parameters:	no parameters

This callback is triggered if a beep set by beep() is finished

BrickletPiezoSpeaker->CALLBACK_MORSE_CODE_FINISHED¶

Callback Parameters:	no parameters

This callback is triggered if the playback of the morse code set by morse_code() is finished.

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.

BrickletPiezoSpeaker->get_api_version()¶

Return Array:	0: \@api_version – 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.

BrickletPiezoSpeaker->get_response_expected($function_id)¶

Parameters:	$function_id – Type: int, Range: See constants
Returns:	$response_expected – Type: bool

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 set_response_expected(). 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:

• BrickletPiezoSpeaker->FUNCTION_BEEP = 1
• BrickletPiezoSpeaker->FUNCTION_MORSE_CODE = 2

BrickletPiezoSpeaker->set_response_expected($function_id, $response_expected)¶

Parameters:	$function_id – Type: int, Range: See constants $response_expected – Type: bool
Returns:	undef

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:

• BrickletPiezoSpeaker->FUNCTION_BEEP = 1
• BrickletPiezoSpeaker->FUNCTION_MORSE_CODE = 2

BrickletPiezoSpeaker->set_response_expected_all($response_expected)¶

Parameters:	$response_expected – Type: bool
Returns:	undef

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

Constants¶

BrickletPiezoSpeaker->DEVICE_IDENTIFIER¶

This constant is used to identify a Piezo Speaker Bricklet.

The get_identity() 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.

BrickletPiezoSpeaker->DEVICE_DISPLAY_NAME¶

This constant represents the human readable name of a Piezo Speaker Bricklet.