BakeBit - Button/zh
From FriendlyELEC WiKi
1 介绍
- BakeBit - Button是一个瞬时(非自锁)按钮开关模块,用于检测按键事件,按钮被释放后自动恢复到常态。
- 在按钮未被按下时模块输出高电平,按钮被按下后输出低电平。
2 特性
- 使用标准的2.0mm 4 Pin BakeBit接口
- 数字信号输出
- PCB尺寸(mm):20x24
- 引脚说明:
名称 | 描述 |
GND | 地 |
5V | 电源5V |
NC | 空 |
SIG | 信号 |
3 示例程序:Button And Buzzer
本示例需要配合蜂鸣器使用。
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 - Button.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)