Difference between revisions of "BakeBit - Buzzer"

Revision as of 13:44, 11 December 2016

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1 Introduction

Buzzer

• The BakeBit-Buzzer is a passive buzzer. To drive this buzzer an oscillating source generating 2.7K square waves is needed.
• PWM input signals with different frequencies generate different sounds.
• It can be used in electronic devices that need sound generators.

2 Hardware Spec

• Standard 2.0mm pitch 4 Pin BakeBit interface
• PWM input
• PCB dimension(mm): 20 x 24

• Pin Description:

3 Code Sample: Button And Buzzer

A BakeBit - Button module is needed in this test case.

3.1 Hardware Connection

Connect the buzzer module to the NEO-Hub at D3 and the button module to the NEO-Hub at D4:

3.2 Source Code

import bakebit
import time
# Connect the BakeBit Ultrasonic Ranger to digital port D4
# SIG,NC,VCC,GND
ultrasonic_ranger = 4
 
# Connect the BakeBit LED to digital port D3
led = 3                                                                      
 
bakebit.pinMode(led,"OUTPUT")
light = 0
 
while True:
    try:
        # Read distance value from Ultrasonic
	distance = bakebit.ultrasonicRead(ultrasonic_ranger)
        print(distance)
	if distance > 0:
		if distance<10: 
			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:
	bakebit.digitalWrite(led,0)
        break
 
    except TypeError:
        print ("Error")
    except IOError:
        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)