Difference between revisions of "BakeBit - Buzzer/zh"
From FriendlyELEC WiKi
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<syntaxhighlight lang="python"> | <syntaxhighlight lang="python"> | ||
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import time | 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: | 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" | |
| − | if | + | 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) | |
| − | else: | + | break |
| − | + | except (IOError,TypeError) as e: | |
| − | + | print("Error") | |
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
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</syntaxhighlight> | </syntaxhighlight> | ||
| − | [https://github.com/friendlyarm/BakeBit/blob/master/Software/Python/bakebit_prj_Button_And_Buzzer | + | [https://github.com/friendlyarm/BakeBit/blob/master/Software/Python/bakebit_prj_Button_And_Buzzer.py Github] |
=== 运行示例 === | === 运行示例 === | ||
Revision as of 09:28, 12 April 2017
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)
