# Buzzer : Buzzer device

This module is a General Buzzer operation module.

User can use the following code to import the Buzzer module.

var Buzzer = require('buzzer');

# Support

The following shows Buzzer module APIs available for each permissions.

# Buzzer Class

# new Buzzer()

• Returns: {Object} Returns buzzer object.

Open buzzer object, an exception will be thrown if it fails to open.

# Buzzer.open()

• Returns: {Object} Returns buzzer object.

Open buzzer object, return undefined if it fails to open.

# Example

var buzzer = new Buzzer();
var buzzer = Buzzer.open();

# Buzzer Object

# buzzer.close()

Close this buzzer and reclaiming file descriptors. If user forgets to call this function, the file descriptor is automatically reclaimed when the object is destroyed.

# buzzer.beep(param)

• param {Object} Buzzer control parameters.
• Returns: {Boolean} Whether the operation was successful.

param is the control parameter object, it can contain the following members:

• hz {Integer} Sound frequency. The human ear can hear sound frequency of 20 ~ 20KHz, the default is 5KHz.
• time {Integer} The execution time of this command, in milliseconds.
• beep {Boolean} Tweet or mute.

Send a command to the buzzer.

# Example

buzzer.beep({ time: 200 });

# buzzer.flush()

Clear the buzzer command queue and stop beeping.

# Example

buzzer.beep({ time: 200 });
buzzer.flush();