BakeBit - Buzzer/zh
From FriendlyELEC WiKi
1 介绍
- BakeBit - Buzzer是一个无源蜂鸣器模块,无源蜂鸣器内部有音圈和钼片,输入2.7KHz的PWM信号时,PWM信号通过绕在支架上的线包在支架的芯柱上产生一交变的磁通,交变的磁通和磁环恒定磁通进行叠加,使钼片以给定的PWM信号频率振动并配合共振腔发声。
- 通过调整输入PWM信号的频率即可使无源蜂鸣器发出频率不同的声音。
- 广泛应用于计算机、报警器、电子玩具、汽车电子设备、定时器等电子产品中作发声器件。
2 特性
- 使用标准的2.0mm 4 Pin BakeBit接口
- PWM信号输入
- PCB尺寸(mm):20x24
- 引脚说明:
名称 | 描述 |
GND | 电源5V |
5V | 地 |
NC | 空 |
SIG | 输入,接PWM |
3 示例程序:Button And Buzzer
本示例需要配合BakeBit - Button使用。
3.1 硬件连接
简单的将 蜂鸣器 模块插入 D3接口,将 按键 插入 D4 接口,如下面这样:
3.2 示例源代码
import time from bakebit import * import math buzzer_pin = 3 #Port for buzzer button = 4 #Port for Button pinMode(buzzer_pin,"OUTPUT") # Assign mode for buzzer as output pinMode(button,"INPUT") # Assign mode for Button as input while True: try: button_status= digitalRead(button) #Read the Button status if button_status: #If the Button is in HIGH position, run the program analogWrite(buzzer_pin,0) print "\tOff" else: #If Button is in Off position, print "Off" on the screen analogWrite(buzzer_pin,127) print "Buzzing" except KeyboardInterrupt: # Stop the buzzer before stopping digitalWrite(buzzer_pin,0) break except (IOError,TypeError) as e: print("Error")
3.3 运行示例
假设你已经参考bakebit教程安装了BakeBit源代码,
要运行示例程序,可以在开发板上进入 BakeBit/Software/Python目录,运行bakebit_prj_Button_And_Buzzer.py:
cd ~/BakeBit/Software/Python sudo python bakebit_prj_Button_And_Buzzer.py
3.4 运行结果
当按下按键时,蜂鸣器会响起,松开按键时,蜂鸣器停止。
4 相关资料
- [Schematic](BakeBit - Buzzer.pdf)
- [BakeBit Github项目](https://github.com/friendlyarm/BakeBit)
- [BakeBit Starter Kit手册](http://wiki.friendlyarm.com/bakebit/bakebit_starter_kit_manual_cn.pdf)