Difference between revisions of "BakeBit - Buzzer/zh"

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(→‎运行结果)
 
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<syntaxhighlight lang="python">
 
<syntaxhighlight lang="python">
−
import bakebit
 
 
import time
 
import time
−
# Connect the BakeBit Ultrasonic Ranger to digital port D4
+
from bakebit import *
−
# SIG,NC,VCC,GND
+
import math
−
ultrasonic_ranger = 4
+
  
−
# Connect the BakeBit LED to digital port D3
+
buzzer_pin = 3 #Port for buzzer
−
led = 3                                                                     
+
button = 4 #Port for Button
 +
old_button_status = -1
 +
pinMode(buzzer_pin,"OUTPUT") # Assign mode for buzzer as output
 +
pinMode(button,"INPUT") # Assign mode for Button as input
  
−
bakebit.pinMode(led,"OUTPUT")
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buzzer_on = False
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light = 0
+
old_buzzer_on = not buzzer_on
 +
button_pressed = False
  
 
while True:
 
while True:
−
    try:
+
try:
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        # Read distance value from Ultrasonic
+
while True:
−
distance = bakebit.ultrasonicRead(ultrasonic_ranger)
+
button_status = digitalRead(button) #Read the Button status
−
        print(distance)
+
# print button_status
−
if distance > 0:
+
if old_button_status < 0:  
−
if distance<10:  
+
break
−
if light == 0:
+
−
print("\ton")
+
−
bakebit.digitalWrite(led,1)
+
−
light = 1
+
−
else:
+
−
if light == 1:
+
−
print("\toff")
+
−
bakebit.digitalWrite(led,0)
+
−
light = 0
+
−
time.sleep(.2)
+
  
−
    except KeyboardInterrupt:
+
if button_status != old_button_status:
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bakebit.digitalWrite(led,0)
+
break
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        break
+
 
 +
time.sleep(0.2)
 +
old_button_status = button_status
 +
 
 +
if button_status == 0:
 +
button_pressed = True
 +
else:
 +
if button_pressed:
 +
buzzer_on = not buzzer_on
 +
button_pressed = False
  
−
    except TypeError:
+
if old_buzzer_on != buzzer_on:
−
        print ("Error")
+
old_buzzer_on = buzzer_on
−
    except IOError:
+
if buzzer_on:
−
        print ("Error")
+
analogWrite(buzzer_pin,127)
 +
print "Buzzing"
 +
else:
 +
analogWrite(buzzer_pin,0)
 +
print "\tOff"
 +
 +
time.sleep(0.2)
 +
except KeyboardInterrupt: # Stop the buzzer before stopping
 +
digitalWrite(buzzer_pin,0)
 +
break
 +
except (IOError,TypeError) as e:
 +
print("Error")
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
[https://github.com/friendlyarm/BakeBit/blob/master/Software/Python/bakebit_prj_Button_And_Buzzer.py.py Github]
+
[https://github.com/friendlyarm/BakeBit/blob/master/Software/Python/bakebit_prj_Button_And_Buzzer.py Github]
  
 
=== 运行示例 ===
 
=== 运行示例 ===
Line 94: Line 106:
 
=== 运行结果 ===
 
=== 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。
+
当点击按键时，蜂鸣器会响起，再次点击按键，蜂鸣器停止。
  
 
==相关资料==
 
==相关资料==

Latest revision as of 06:02, 17 April 2017

English

1 介绍

Buzzer
  • 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

无源蜂鸣器PCB

  • 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：

Button And Buzzer-1.jpg Button And Buzzer-2.jpg

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
old_button_status = -1
pinMode(buzzer_pin,"OUTPUT")	# Assign mode for buzzer as output
pinMode(button,"INPUT")		# Assign mode for Button as input
 
buzzer_on = False
old_buzzer_on = not buzzer_on
button_pressed = False
 
while True:
	try:
		while True:
			button_status = digitalRead(button)	#Read the Button status
			# print button_status
			if old_button_status < 0: 
				break
 
			if button_status != old_button_status:
				break
 
		time.sleep(0.2)
		old_button_status = button_status
 
		if button_status == 0:
			button_pressed = True
		else:
			if button_pressed:
				buzzer_on = not buzzer_on
			button_pressed = False 
 
		if old_buzzer_on != buzzer_on:
			old_buzzer_on = buzzer_on
			if buzzer_on:
				analogWrite(buzzer_pin,127)
				print "Buzzing"
			else:
				analogWrite(buzzer_pin,0)
				print "\tOff"			
 
		time.sleep(0.2)			
	except KeyboardInterrupt:	# Stop the buzzer before stopping
		digitalWrite(buzzer_pin,0)
		break
	except (IOError,TypeError) as e:
		print("Error")

Github

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

当点击按键时，蜂鸣器会响起，再次点击按键，蜂鸣器停止。

4 相关资料

Retrieved from "https://wiki.friendlyelec.com/wiki/index.php?title=BakeBit_-_Buzzer/zh&oldid=9989"